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jleake-xLhkCMTzzpz10XsdtD+oqA@public.gmane.org

2013-Mar-24 12:20 UTC

Rails 4.0 has_many_through and fields_for

Hi all, I am trying to reproduce rails 3.2 behaviour with fields_for and 
nested attributes.

    class ControllerAction < ActiveRecord::Base
      has_many :interactions, dependent: :destroy
      has_many :roles, through: :interactions

      scope :controllers, lambda {|name| where("controller_name_id =
?",
name)}
      scope :actions, lambda {|name| where("action_name_id = ?",
name)}

      def initialized_interactions() # this is the key method
        [].tap do |o|
          Role.all.each do |r|
            if p = interactions.find { |p| p.role_id == r.id }
              o << p.tap { |p| p.enable ||= true }
            else
              o << Interaction.new(:role_id => r.id)
            end
          end
        end
      end
    end

    class Role < ActiveRecord::Base
      has_many :interactions
    end

    class Interaction < ActiveRecord::Base
      belongs_to :controller_action
      belongs_to :role
      attr_accessor :enable # nice little thingy here
      # It is now recommended to use strong params instead of   
''attr_accessible :enable, :controller_action_id, :role_id''
    end

controller_actions_controller.rb
    ...
      private
        # Use callbacks to share common setup or constraints between 
actions.
        def set_controller_action
          @controller_action = ControllerAction.find(params[:id])
        end

        # Never trust parameters from the scary internet, only allow the 
white list through.
        def controller_action_params
          params.require(:controller_action).permit!
        end

controller_actions view - excluding error code and most css formatting.
_form.rb

    <%= form_for(@controller_action) do |f| %>
      ...
      <%= f.label :name %><br />
      <%= f.text_field :name %>
      
      <h2><%= f.label :role %></h2>
      <%= f.fields_for :interactions, 
@controller_action.initialized_interactions() do |builder| %>
          <% role = builder.object.role %>
          <%= builder.hidden_field :role_id %>

          <%= builder.check_box :enable %>
          <%= builder.label :enable, role.name %>
 
      <% end %>

      <%= f.submit %>

    <% end %>

Under rails 3.2.11 I get a form that allows the user to edit roles.
Editing controller_action 
Name
  Roles 
 Webmaster 
 Admin 
 Moderator 
 Editor 
 Registered User 
 Guest 
  Show <http://localhost:3200/controller_actions/1> |
Back<http://localhost:3200/controller_actions>

Under Rails 4.0 you get:-

undefined method `role'' for #<Array:0xb875d4c>

 Extracted source (around line *#21*):
   
18192021222324
          
        <div>
         <h2><%= f.label :role %></h2>
         <%= f.fields_for :interactions,
@controller_action.initialized_interactions() do |builder| %>
             <% role = builder.object.role %>
             <%= builder.hidden_field :role_id %>
                <div class="field">

   Trace of template inclusion: app/views/controller_actions/edit.html.erb

Rails.root: /home/john/RubyMineProjects/Rails/4.0/urps2
 Application Trace <http://localhost:3100/controller_actions/1/edit#> |
Framework
Trace <http://localhost:3100/controller_actions/1/edit#> | Full
Trace<http://localhost:3100/controller_actions/1/edit#>

app/views/controller_actions/_form.html.erb:21:in `block (2 levels) in
_app_views_controller_actions__form_html_erb__366592963_95670400''
actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in `block
in capture''
actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:200:in
`with_output_buffer''
actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
`capture''
actionpack (4.0.0.beta1) lib/action_view/helpers/form_helper.rb:707:in
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actionpack (4.0.0.beta1) lib/action_view/helpers/form_helper.rb:1501:in
`fields_for''
app/views/controller_actions/_form.html.erb:20:in `block in
_app_views_controller_actions__form_html_erb__366592963_95670400''
actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in `block
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`with_output_buffer''
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`capture''
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`form_for''
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`_app_views_controller_actions__form_html_erb__366592963_95670400''
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render''
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`instrument''
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`render_partial''
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`block in render''
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`block in instrument''
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`render''
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`_app_views_controller_actions_edit_html_erb__785330494_92185850''
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`block (2 levels) in render''
activesupport (4.0.0.beta1) lib/active_support/core_ext/benchmark.rb:5:in `block
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/home/john/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/benchmark.rb:296:in
`realtime''
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`send_action''
actionpack (4.0.0.beta1) lib/abstract_controller/base.rb:189:in
`process_action''
actionpack (4.0.0.beta1) lib/action_controller/metal/rendering.rb:10:in
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activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
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/home/john/.rvm/gems/ruby-2.0.0-p0@rails-4/bin/unicorn_rails:23:in `<top
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ruby-debug-ide (0.4.17.beta16) bin/rdebug-ide:109:in `<top
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-e:1:in `load''
-e:1:in `<main>''

 Request 

*Parameters*:

{"id"=>"1"}

 Toggle session dump <http://localhost:3100/controller_actions/1/edit#>
 Toggle env dump <http://localhost:3100/controller_actions/1/edit#>
 Response 

*Headers*:

None


Sorry about the verbosity but I am really struggling to solve this most 
basic use case.

I have tried to figure out why the form builder returns an array but and 
would write my own if I could figure out how to.

Any help appreciated. 

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Dheeraj Kumar

2013-Mar-24 12:35 UTC

head link

Re: Rails 4.0 has_many_through and fields_for

Simple. You return an array from initialized_interactions.That''s why.

-- 
Dheeraj Kumar


On Sunday 24 March 2013 at 5:50 PM,
jleake-xLhkCMTzzpz10XsdtD+oqA@public.gmane.org wrote:
> Hi all, I am trying to reproduce rails 3.2 behaviour with fields_for and
nested attributes.
> 
>     class ControllerAction < ActiveRecord::Base
>       has_many :interactions, dependent: :destroy
>       has_many :roles, through: :interactions
> 
>       scope :controllers, lambda {|name| where("controller_name_id =
?", name)}
>       scope :actions, lambda {|name| where("action_name_id = ?",
name)}
> 
>       def initialized_interactions() # this is the key method
>         [].tap do |o|
>           Role.all.each do |r|
>             if p = interactions.find { |p| p.role_id == r.id }
>               o << p.tap { |p| p.enable ||= true }
>             else
>               o << Interaction.new(:role_id => r.id)
>             end
>           end
>         end
>       end
>     end
> 
>     class Role < ActiveRecord::Base
>       has_many :interactions
>     end
> 
>     class Interaction < ActiveRecord::Base
>       belongs_to :controller_action
>       belongs_to :role
>       attr_accessor :enable # nice little thingy here
>       # It is now recommended to use strong params instead of  
''attr_accessible :enable, :controller_action_id, :role_id''
>     end
> 
> controller_actions_controller.rb
>     ...
>       private
>         # Use callbacks to share common setup or constraints between
actions.
>         def set_controller_action
>           @controller_action = ControllerAction.find(params[:id])
>         end
> 
>         # Never trust parameters from the scary internet, only allow the
white list through.
>         def controller_action_params
>           params.require(:controller_action).permit!
>         end
> 
> controller_actions view - excluding error code and most css formatting.
> _form.rb
> 
>     <%= form_for(@controller_action) do |f| %>
>       ...
>       <%= f.label :name %><br />
>       <%= f.text_field :name %>
>       
>       <h2><%= f.label :role %></h2>
>       <%= f.fields_for :interactions,
@controller_action.initialized_interactions() do |builder| %>
>           <% role = builder.object.role %>
>           <%= builder.hidden_field :role_id %>
> 
>           <%= builder.check_box :enable %>
>           <%= builder.label :enable, role.name (http://role.name) %>
>  
>       <% end %>
> 
>       <%= f.submit %>
> 
>     <% end %>
> 
> Under rails 3.2.11 I get a form that allows the user to edit roles.
> Editing controller_action 
> Name
> Roles 
> Webmaster 
> Admin 
> Moderator 
> Editor 
> Registered User 
> Guest 
> 
> 
> 
> Show (http://localhost:3200/controller_actions/1) | Back
(http://localhost:3200/controller_actions)
> 
> Under Rails 4.0 you get:-
> undefined method `role'' for #<Array:0xb875d4c> 
> Extracted source (around line #21):
> 
> 18 19 20 21 22 23 24 
> 
> <div> 
> <h2><%= f.label :role %></h2> 
> <%= f.fields_for :interactions,
@controller_action.initialized_interactions() do |builder| %>
> <% role = builder.object.role %> 
> <%= builder.hidden_field :role_id %> 
> 
> <div class="field"> 
> 
> 
> 
> 
> 
> 
> 
> Trace of template inclusion: app/views/controller_actions/edit.html.erb
> Rails.root: /home/john/RubyMineProjects/Rails/4.0/urps2
> Application Trace (http://localhost:3100/controller_actions/1/edit#) |
Framework Trace (http://localhost:3100/controller_actions/1/edit#) | Full Trace
(http://localhost:3100/controller_actions/1/edit#)
> app/views/controller_actions/_form.html.erb:21:in `block (2 levels) in
_app_views_controller_actions__form_html_erb__366592963_95670400''
actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in `block
in capture'' actionpack (4.0.0.beta1)
lib/action_view/helpers/capture_helper.rb:200:in `with_output_buffer''
actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
`capture'' actionpack (4.0.0.beta1)
lib/action_view/helpers/form_helper.rb:707:in `fields_for'' actionpack
(4.0.0.beta1) lib/action_view/helpers/form_helper.rb:1501:in
`fields_for'' app/views/controller_actions/_form.html.erb:20:in `block
in _app_views_controller_actions__form_html_erb__366592963_95670400''
actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in `block
in capture'' actionpack (4.0.0.beta1)
lib/action_view/helpers/capture_helper.rb:200:in `with_output_buffer''
actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
`capture'' actionpack (4.0.0.beta1) lib/action_view/helpers/form_helper.rb:435:in `form_for''
app/views/controller_actions/_form.html.erb:1:in
`_app_views_controller_actions__form_html_erb__366592963_95670400''
actionpack (4.0.0.beta1) lib/action_view/template.rb:143:in `block in
render'' activesupport (4.0.0.beta1)
lib/active_support/notifications.rb:160:in `instrument'' actionpack
(4.0.0.beta1) lib/action_view/template.rb:141:in `render'' actionpack
(4.0.0.beta1) lib/action_view/renderer/partial_renderer.rb:306:in
`render_partial'' actionpack (4.0.0.beta1)
lib/action_view/renderer/partial_renderer.rb:279:in `block in render''
actionpack (4.0.0.beta1) lib/action_view/renderer/abstract_renderer.rb:23:in
`block in instrument'' activesupport (4.0.0.beta1)
lib/active_support/notifications.rb:158:in `block in instrument''
activesupport (4.0.0.beta1)
lib/active_support/notifications/instrumenter.rb:20:in `instrument''
activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`instrument'' actionpack (4.0.0.beta1) lib/act
ion_view/renderer/abstract_renderer.rb:23:in `instrument'' actionpack
(4.0.0.beta1) lib/action_view/renderer/partial_renderer.rb:278:in
`render'' actionpack (4.0.0.beta1)
lib/action_view/renderer/renderer.rb:41:in `render_partial'' actionpack
(4.0.0.beta1) lib/action_view/helpers/rendering_helper.rb:27:in
`render'' app/views/controller_actions/edit.html.erb:3:in
`_app_views_controller_actions_edit_html_erb__785330494_92185850''
actionpack (4.0.0.beta1) lib/action_view/template.rb:143:in `block in
render'' activesupport (4.0.0.beta1)
lib/active_support/notifications.rb:160:in `instrument'' actionpack
(4.0.0.beta1) lib/action_view/template.rb:141:in `render'' actionpack
(4.0.0.beta1) lib/action_view/renderer/template_renderer.rb:49:in `block (2
levels) in render_template'' actionpack (4.0.0.beta1)
lib/action_view/renderer/abstract_renderer.rb:23:in `block in
instrument'' activesupport (4.0.0.beta1)
lib/active_support/notifications.rb:158:in `block in instrument''
activesupport (4.0.0.beta1) lib/a
ctive_support/notifications/instrumenter.rb:20:in `instrument''
activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`instrument'' actionpack (4.0.0.beta1)
lib/action_view/renderer/abstract_renderer.rb:23:in `instrument''
actionpack (4.0.0.beta1) lib/action_view/renderer/template_renderer.rb:48:in
`block in render_template'' actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:56:in
`render_with_layout'' actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:47:in `render_template''
actionpack (4.0.0.beta1) lib/action_view/renderer/template_renderer.rb:17:in
`render'' actionpack (4.0.0.beta1)
lib/action_view/renderer/renderer.rb:36:in `render_template'' actionpack
(4.0.0.beta1) lib/action_view/renderer/renderer.rb:17:in `render''
actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:119:in
`_render_template'' actionpack (4.0.0.beta1)
lib/action_controller/metal/streaming.rb:219:in `_render_template''
actionpack (4.0.0.beta1) lib/abstra
ct_controller/rendering.rb:112:in `render_to_body'' actionpack
(4.0.0.beta1) lib/action_controller/metal/rendering.rb:33:in
`render_to_body'' actionpack (4.0.0.beta1)
lib/action_controller/metal/renderers.rb:26:in `render_to_body''
actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:97:in
`render'' actionpack (4.0.0.beta1)
lib/action_controller/metal/rendering.rb:16:in `render'' actionpack
(4.0.0.beta1) lib/action_controller/metal/instrumentation.rb:41:in `block (2
levels) in render'' activesupport (4.0.0.beta1)
lib/active_support/core_ext/benchmark.rb:5:in `block in ms''
/home/john/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/benchmark.rb:296:in
`realtime'' activesupport (4.0.0.beta1)
lib/active_support/core_ext/benchmark.rb:5:in `ms'' actionpack
(4.0.0.beta1) lib/action_controller/metal/instrumentation.rb:41:in `block in
render'' actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:84:in
`cleanup_view_runtime'' activerecord (4.0.0.beta1)
lib/active_record/railties/con
troller_runtime.rb:24:in `cleanup_view_runtime'' actionpack
(4.0.0.beta1) lib/action_controller/metal/instrumentation.rb:40:in
`render'' actionpack (4.0.0.beta1)
lib/action_controller/metal/implicit_render.rb:10:in `default_render''
actionpack (4.0.0.beta1) lib/action_controller/metal/implicit_render.rb:5:in
`send_action'' actionpack (4.0.0.beta1)
lib/abstract_controller/base.rb:189:in `process_action'' actionpack
(4.0.0.beta1) lib/action_controller/metal/rendering.rb:10:in
`process_action'' actionpack (4.0.0.beta1)
lib/abstract_controller/callbacks.rb:18:in `block in process_action''
activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:413:in
`_run__68927184__process_action__callbacks'' activesupport (4.0.0.beta1)
lib/active_support/callbacks.rb:78:in `run_callbacks'' actionpack
(4.0.0.beta1) lib/abstract_controller/callbacks.rb:17:in
`process_action'' actionpack (4.0.0.beta1)
lib/action_controller/metal/rescue.rb:29:in `process_action'' actionpack
(4.0.0.beta1) lib/action_controller/me
tal/instrumentation.rb:31:in `block in process_action'' activesupport
(4.0.0.beta1) lib/active_support/notifications.rb:158:in `block in
instrument'' activesupport (4.0.0.beta1)
lib/active_support/notifications/instrumenter.rb:20:in `instrument''
activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`instrument'' actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:30:in `process_action''
actionpack (4.0.0.beta1) lib/action_controller/metal/params_wrapper.rb:245:in
`process_action'' activerecord (4.0.0.beta1)
lib/active_record/railties/controller_runtime.rb:18:in `process_action''
actionpack (4.0.0.beta1) lib/abstract_controller/base.rb:136:in
`process'' actionpack (4.0.0.beta1)
lib/abstract_controller/rendering.rb:44:in `process'' actionpack
(4.0.0.beta1) lib/action_controller/metal.rb:196:in `dispatch''
actionpack (4.0.0.beta1) lib/action_controller/metal/rack_delegation.rb:13:in
`dispatch'' actionpack (4.0.0.beta1)
lib/action_controller/metal.rb:232:in `bl
ock in action'' actionpack (4.0.0.beta1)
lib/action_dispatch/routing/route_set.rb:78:in `call'' actionpack
(4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:78:in `dispatch''
actionpack (4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:46:in
`call'' actionpack (4.0.0.beta1)
lib/action_dispatch/journey/router.rb:69:in `block in call'' actionpack
(4.0.0.beta1) lib/action_dispatch/journey/router.rb:57:in `each''
actionpack (4.0.0.beta1) lib/action_dispatch/journey/router.rb:57:in
`call'' actionpack (4.0.0.beta1)
lib/action_dispatch/routing/route_set.rb:651:in `call'' rack (1.5.2)
lib/rack/etag.rb:23:in `call'' rack (1.5.2)
lib/rack/conditionalget.rb:25:in `call'' rack (1.5.2)
lib/rack/head.rb:11:in `call'' actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/params_parser.rb:27:in `call'' actionpack
(4.0.0.beta1) lib/action_dispatch/middleware/flash.rb:241:in `call''
rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'' rack
(1.5.2) lib/rack/session/abstract/id.rb:220:in `call''
actionpack (4.0.0.beta1) lib/action_dispatch/middleware/cookies.rb:452:in
`call'' activerecord (4.0.0.beta1)
lib/active_record/query_cache.rb:36:in `call'' activerecord
(4.0.0.beta1)
lib/active_record/connection_adapters/abstract/connection_pool.rb:632:in
`call'' activerecord (4.0.0.beta1) lib/active_record/migration.rb:348:in
`call'' actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/callbacks.rb:29:in `block in call''
activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:373:in
`_run__125207171__call__callbacks'' activesupport (4.0.0.beta1)
lib/active_support/callbacks.rb:78:in `run_callbacks'' actionpack
(4.0.0.beta1) lib/action_dispatch/middleware/callbacks.rb:27:in `call''
actionpack (4.0.0.beta1) lib/action_dispatch/middleware/reloader.rb:64:in
`call'' actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/remote_ip.rb:76:in `call'' actionpack
(4.0.0.beta1) lib/action_dispatch/middleware/debug_exceptions.rb:17:in
`call'' actionpack (4.0.0.beta1) lib/action_dispatch/middleware/
show_exceptions.rb:30:in `call'' railties (4.0.0.beta1)
lib/rails/rack/logger.rb:38:in `call_app'' railties (4.0.0.beta1)
lib/rails/rack/logger.rb:21:in `block in call'' activesupport
(4.0.0.beta1) lib/active_support/tagged_logging.rb:67:in `block in
tagged'' activesupport (4.0.0.beta1)
lib/active_support/tagged_logging.rb:25:in `tagged'' activesupport
(4.0.0.beta1) lib/active_support/tagged_logging.rb:67:in `tagged''
railties (4.0.0.beta1) lib/rails/rack/logger.rb:21:in `call'' actionpack
(4.0.0.beta1) lib/action_dispatch/middleware/request_id.rb:21:in `call''
rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'' rack (1.5.2)
lib/rack/runtime.rb:17:in `call'' activesupport (4.0.0.beta1)
lib/active_support/cache/strategy/local_cache.rb:72:in `call'' rack
(1.5.2) lib/rack/lock.rb:17:in `call'' actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/static.rb:64:in `call'' railties
(4.0.0.beta1) lib/rails/engine.rb:510:in `call'' railties (4.0.0.beta1)
lib/rails/application.rb:96:in `call'' railties
(4.0.0.beta1) lib/rails/railtie/configurable.rb:30:in `method_missing''
unicorn (4.6.2) lib/unicorn/http_server.rb:552:in `process_client''
unicorn (4.6.2) lib/unicorn/http_server.rb:632:in `worker_loop'' unicorn
(4.6.2) lib/unicorn/http_server.rb:500:in `spawn_missing_workers''
unicorn (4.6.2) lib/unicorn/http_server.rb:511:in
`maintain_worker_count'' unicorn (4.6.2)
lib/unicorn/http_server.rb:277:in `join'' unicorn (4.6.2)
bin/unicorn_rails:209:in `<top (required)>''
/home/john/.rvm/gems/ruby-2.0.0-p0@rails-4/bin/unicorn_rails:23:in
`load''
/home/john/.rvm/gems/ruby-2.0.0-p0@rails-4/bin/unicorn_rails:23:in `<top
(required)>'' ruby-debug-ide (0.4.17.beta16)
lib/ruby-debug-ide.rb:86:in `debug_load'' ruby-debug-ide (0.4.17.beta16)
lib/ruby-debug-ide.rb:86:in `debug_program'' ruby-debug-ide
(0.4.17.beta16) bin/rdebug-ide:109:in `<top (required)>'' -e:1:in
`load'' -e:1:in `<main>''> 
> 
> Request
> Parameters:
> {"id"=>"1"}
> Toggle session dump (http://localhost:3100/controller_actions/1/edit#)
> 
> Toggle env dump (http://localhost:3100/controller_actions/1/edit#)
> 
> Response
> Headers:
> None
> 
> Sorry about the verbosity but I am really struggling to solve this most
basic use case.
> 
> I have tried to figure out why the form builder returns an array but and
would write my own if I could figure out how to.
> 
> Any help appreciated. 
> -- 
> You received this message because you are subscribed to the Google Groups
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jleake-xLhkCMTzzpz10XsdtD+oqA@public.gmane.org

2013-Mar-24 13:37 UTC

head link

Re: Rails 4.0 has_many_through and fields_for

So what should be returned instead ?

On Sunday, 24 March 2013 12:20:49 UTC,
jle...-xLhkCMTzzpz10XsdtD+oqA@public.gmane.org wrote:>
> Hi all, I am trying to reproduce rails 3.2 behaviour with fields_for and 
> nested attributes.
>
>     class ControllerAction < ActiveRecord::Base
>       has_many :interactions, dependent: :destroy
>       has_many :roles, through: :interactions
>
>       scope :controllers, lambda {|name| where("controller_name_id =
?",
> name)}
>       scope :actions, lambda {|name| where("action_name_id = ?",
name)}
>
>       def initialized_interactions() # this is the key method
>         [].tap do |o|
>           Role.all.each do |r|
>             if p = interactions.find { |p| p.role_id == r.id }
>               o << p.tap { |p| p.enable ||= true }
>             else
>               o << Interaction.new(:role_id => r.id)
>             end
>           end
>         end
>       end
>     end
>
>     class Role < ActiveRecord::Base
>       has_many :interactions
>     end
>
>     class Interaction < ActiveRecord::Base
>       belongs_to :controller_action
>       belongs_to :role
>       attr_accessor :enable # nice little thingy here
>       # It is now recommended to use strong params instead of   
> ''attr_accessible :enable, :controller_action_id,
:role_id''
>     end
>
> controller_actions_controller.rb
>     ...
>       private
>         # Use callbacks to share common setup or constraints between 
> actions.
>         def set_controller_action
>           @controller_action = ControllerAction.find(params[:id])
>         end
>
>         # Never trust parameters from the scary internet, only allow the 
> white list through.
>         def controller_action_params
>           params.require(:controller_action).permit!
>         end
>
> controller_actions view - excluding error code and most css formatting.
> _form.rb
>
>     <%= form_for(@controller_action) do |f| %>
>       ...
>       <%= f.label :name %><br />
>       <%= f.text_field :name %>
>       
>       <h2><%= f.label :role %></h2>
>       <%= f.fields_for :interactions, 
> @controller_action.initialized_interactions() do |builder| %>
>           <% role = builder.object.role %>
>           <%= builder.hidden_field :role_id %>
>
>           <%= builder.check_box :enable %>
>           <%= builder.label :enable, role.name %>
>  
>       <% end %>
>
>       <%= f.submit %>
>
>     <% end %>
>
> Under rails 3.2.11 I get a form that allows the user to edit roles.
> Editing controller_action 
> Name
>   Roles 
>  Webmaster 
>  Admin 
>  Moderator 
>  Editor 
>  Registered User 
>  Guest 
>   Show <http://localhost:3200/controller_actions/1> |
Back<http://localhost:3200/controller_actions>
>
> Under Rails 4.0 you get:-
>
> undefined method `role'' for #<Array:0xb875d4c>
>
>  Extracted source (around line *#21*):
>    
> 18192021222324
>           
>         <div>
>          <h2><%= f.label :role %></h2>
>          <%= f.fields_for :interactions,
@controller_action.initialized_interactions() do |builder| %>
>              <% role = builder.object.role %>
>              <%= builder.hidden_field :role_id %>
>                 <div class="field">
>
>    Trace of template inclusion: app/views/controller_actions/edit.html.erb
>
> Rails.root: /home/john/RubyMineProjects/Rails/4.0/urps2
>  Application Trace <http://localhost:3100/controller_actions/1/edit#>
| Framework
> Trace <http://localhost:3100/controller_actions/1/edit#> | Full
Trace<http://localhost:3100/controller_actions/1/edit#>
>
> app/views/controller_actions/_form.html.erb:21:in `block (2 levels) in
_app_views_controller_actions__form_html_erb__366592963_95670400''
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
`block in capture''
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:200:in
`with_output_buffer''
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
`capture''
> actionpack (4.0.0.beta1) lib/action_view/helpers/form_helper.rb:707:in
`fields_for''
> actionpack (4.0.0.beta1) lib/action_view/helpers/form_helper.rb:1501:in
`fields_for''
> app/views/controller_actions/_form.html.erb:20:in `block in
_app_views_controller_actions__form_html_erb__366592963_95670400''
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
`block in capture''
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:200:in
`with_output_buffer''
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
`capture''
> actionpack (4.0.0.beta1) lib/action_view/helpers/form_helper.rb:435:in
`form_for''
> app/views/controller_actions/_form.html.erb:1:in
`_app_views_controller_actions__form_html_erb__366592963_95670400''
> actionpack (4.0.0.beta1) lib/action_view/template.rb:143:in `block in
render''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:160:in
`instrument''
> actionpack (4.0.0.beta1) lib/action_view/template.rb:141:in
`render''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/partial_renderer.rb:306:in `render_partial''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/partial_renderer.rb:279:in `block in render''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/abstract_renderer.rb:23:in `block in
instrument''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`block in instrument''
> activesupport (4.0.0.beta1)
lib/active_support/notifications/instrumenter.rb:20:in `instrument''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`instrument''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/abstract_renderer.rb:23:in `instrument''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/partial_renderer.rb:278:in `render''
> actionpack (4.0.0.beta1) lib/action_view/renderer/renderer.rb:41:in
`render_partial''
> actionpack (4.0.0.beta1) lib/action_view/helpers/rendering_helper.rb:27:in
`render''
> app/views/controller_actions/edit.html.erb:3:in
`_app_views_controller_actions_edit_html_erb__785330494_92185850''
> actionpack (4.0.0.beta1) lib/action_view/template.rb:143:in `block in
render''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:160:in
`instrument''
> actionpack (4.0.0.beta1) lib/action_view/template.rb:141:in
`render''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:49:in `block (2 levels) in
render_template''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/abstract_renderer.rb:23:in `block in
instrument''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`block in instrument''
> activesupport (4.0.0.beta1)
lib/active_support/notifications/instrumenter.rb:20:in `instrument''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`instrument''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/abstract_renderer.rb:23:in `instrument''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:48:in `block in
render_template''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:56:in
`render_with_layout''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:47:in `render_template''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:17:in `render''
> actionpack (4.0.0.beta1) lib/action_view/renderer/renderer.rb:36:in
`render_template''
> actionpack (4.0.0.beta1) lib/action_view/renderer/renderer.rb:17:in
`render''
> actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:119:in
`_render_template''
> actionpack (4.0.0.beta1) lib/action_controller/metal/streaming.rb:219:in
`_render_template''
> actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:112:in
`render_to_body''
> actionpack (4.0.0.beta1) lib/action_controller/metal/rendering.rb:33:in
`render_to_body''
> actionpack (4.0.0.beta1) lib/action_controller/metal/renderers.rb:26:in
`render_to_body''
> actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:97:in
`render''
> actionpack (4.0.0.beta1) lib/action_controller/metal/rendering.rb:16:in
`render''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:41:in `block (2 levels) in
render''
> activesupport (4.0.0.beta1) lib/active_support/core_ext/benchmark.rb:5:in
`block in ms''
> /home/john/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/benchmark.rb:296:in
`realtime''
> activesupport (4.0.0.beta1) lib/active_support/core_ext/benchmark.rb:5:in
`ms''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:41:in `block in render''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:84:in
`cleanup_view_runtime''
> activerecord (4.0.0.beta1)
lib/active_record/railties/controller_runtime.rb:24:in
`cleanup_view_runtime''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:40:in `render''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/implicit_render.rb:10:in `default_render''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/implicit_render.rb:5:in `send_action''
> actionpack (4.0.0.beta1) lib/abstract_controller/base.rb:189:in
`process_action''
> actionpack (4.0.0.beta1) lib/action_controller/metal/rendering.rb:10:in
`process_action''
> actionpack (4.0.0.beta1) lib/abstract_controller/callbacks.rb:18:in `block
in process_action''
> activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:413:in
`_run__68927184__process_action__callbacks''
> activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:78:in
`run_callbacks''
> actionpack (4.0.0.beta1) lib/abstract_controller/callbacks.rb:17:in
`process_action''
> actionpack (4.0.0.beta1) lib/action_controller/metal/rescue.rb:29:in
`process_action''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:31:in `block in
process_action''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`block in instrument''
> activesupport (4.0.0.beta1)
lib/active_support/notifications/instrumenter.rb:20:in `instrument''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`instrument''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:30:in `process_action''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/params_wrapper.rb:245:in `process_action''
> activerecord (4.0.0.beta1)
lib/active_record/railties/controller_runtime.rb:18:in `process_action''
> actionpack (4.0.0.beta1) lib/abstract_controller/base.rb:136:in
`process''
> actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:44:in
`process''
> actionpack (4.0.0.beta1) lib/action_controller/metal.rb:196:in
`dispatch''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/rack_delegation.rb:13:in `dispatch''
> actionpack (4.0.0.beta1) lib/action_controller/metal.rb:232:in `block in
action''
> actionpack (4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:78:in
`call''
> actionpack (4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:78:in
`dispatch''
> actionpack (4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:46:in
`call''
> actionpack (4.0.0.beta1) lib/action_dispatch/journey/router.rb:69:in `block
in call''
> actionpack (4.0.0.beta1) lib/action_dispatch/journey/router.rb:57:in
`each''
> actionpack (4.0.0.beta1) lib/action_dispatch/journey/router.rb:57:in
`call''
> actionpack (4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:651:in
`call''
> rack (1.5.2) lib/rack/etag.rb:23:in `call''
> rack (1.5.2) lib/rack/conditionalget.rb:25:in `call''
> rack (1.5.2) lib/rack/head.rb:11:in `call''
> actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/params_parser.rb:27:in `call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/flash.rb:241:in
`call''
> rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context''
> rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/cookies.rb:452:in
`call''
> activerecord (4.0.0.beta1) lib/active_record/query_cache.rb:36:in
`call''
> activerecord (4.0.0.beta1)
lib/active_record/connection_adapters/abstract/connection_pool.rb:632:in
`call''
> activerecord (4.0.0.beta1) lib/active_record/migration.rb:348:in
`call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/callbacks.rb:29:in
`block in call''
> activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:373:in
`_run__125207171__call__callbacks''
> activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:78:in
`run_callbacks''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/callbacks.rb:27:in
`call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/reloader.rb:64:in
`call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/remote_ip.rb:76:in
`call''
> actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call''
> actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/show_exceptions.rb:30:in `call''
> railties (4.0.0.beta1) lib/rails/rack/logger.rb:38:in `call_app''
> railties (4.0.0.beta1) lib/rails/rack/logger.rb:21:in `block in
call''
> activesupport (4.0.0.beta1) lib/active_support/tagged_logging.rb:67:in
`block in tagged''
> activesupport (4.0.0.beta1) lib/active_support/tagged_logging.rb:25:in
`tagged''
> activesupport (4.0.0.beta1) lib/active_support/tagged_logging.rb:67:in
`tagged''
> railties (4.0.0.beta1) lib/rails/rack/logger.rb:21:in `call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/request_id.rb:21:in
`call''
> rack (1.5.2) lib/rack/methodoverride.rb:21:in `call''
> rack (1.5.2) lib/rack/runtime.rb:17:in `call''
> activesupport (4.0.0.beta1)
lib/active_support/cache/strategy/local_cache.rb:72:in `call''
> rack (1.5.2) lib/rack/lock.rb:17:in `call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/static.rb:64:in
`call''
> railties (4.0.0.beta1) lib/rails/engine.rb:510:in `call''
> railties (4.0.0.beta1) lib/rails/application.rb:96:in `call''
> railties (4.0.0.beta1) lib/rails/railtie/configurable.rb:30:in
`method_missing''
> unicorn (4.6.2) lib/unicorn/http_server.rb:552:in `process_client''
> unicorn (4.6.2) lib/unicorn/http_server.rb:632:in `worker_loop''
> unicorn (4.6.2) lib/unicorn/http_server.rb:500:in
`spawn_missing_workers''
> unicorn (4.6.2) lib/unicorn/http_server.rb:511:in
`maintain_worker_count''
> unicorn (4.6.2) lib/unicorn/http_server.rb:277:in `join''
> unicorn (4.6.2) bin/unicorn_rails:209:in `<top (required)>''
> /home/john/.rvm/gems/ruby-2.0.0-p0@rails-4/bin/unicorn_rails:23:in
`load''
> /home/john/.rvm/gems/ruby-2.0.0-p0@rails-4/bin/unicorn_rails:23:in `<top
(required)>''
> ruby-debug-ide (0.4.17.beta16) lib/ruby-debug-ide.rb:86:in
`debug_load''
> ruby-debug-ide (0.4.17.beta16) lib/ruby-debug-ide.rb:86:in
`debug_program''
> ruby-debug-ide (0.4.17.beta16) bin/rdebug-ide:109:in `<top
(required)>''
> -e:1:in `load''
> -e:1:in `<main>''
>
>  Request 
>
> *Parameters*:
>
> {"id"=>"1"}
>
>  Toggle session dump
<http://localhost:3100/controller_actions/1/edit#>
>  Toggle env dump <http://localhost:3100/controller_actions/1/edit#>
>  Response 
>
> *Headers*:
>
> None
>
>
> Sorry about the verbosity but I am really struggling to solve this most 
> basic use case.
>
> I have tried to figure out why the form builder returns an array but and 
> would write my own if I could figure out how to.
>
> Any help appreciated. 
>
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Dheeraj Kumar

2013-Mar-24 13:42 UTC

head link

Re: Re: Rails 4.0 has_many_through and fields_for

Your question is wrong. You should not be rendering a form for :interactions
(which will be an AR::Relation) using an array. You should rather be
initializing the controller_action.interactions directly, and remove the second
parameter in the fields_for call.

-- 
Dheeraj Kumar


On Sunday 24 March 2013 at 7:07 PM,
jleake-xLhkCMTzzpz10XsdtD+oqA@public.gmane.org wrote:
> So what should be returned instead ?
> 
> On Sunday, 24 March 2013 12:20:49 UTC,
jle...-xLhkCMTzzpz10XsdtD+oqA@public.gmane.org (http://socit.co.uk) wrote:
> > Hi all, I am trying to reproduce rails 3.2 behaviour with fields_for
and nested attributes.
> > 
> >     class ControllerAction < ActiveRecord::Base
> >       has_many :interactions, dependent: :destroy
> >       has_many :roles, through: :interactions
> > 
> >       scope :controllers, lambda {|name|
where("controller_name_id = ?", name)}
> >       scope :actions, lambda {|name| where("action_name_id =
?", name)}
> > 
> >       def initialized_interactions() # this is the key method
> >         [].tap do |o|
> >           Role.all.each do |r|
> >             if p = interactions.find { |p| p.role_id == r.id
(http://r.id) }
> >               o << p.tap { |p| p.enable ||= true }
> >             else
> >               o << Interaction.new(:role_id => r.id
(http://r.id))
> >             end
> >           end
> >         end
> >       end
> >     end
> > 
> >     class Role < ActiveRecord::Base
> >       has_many :interactions
> >     end
> > 
> >     class Interaction < ActiveRecord::Base
> >       belongs_to :controller_action
> >       belongs_to :role
> >       attr_accessor :enable # nice little thingy here
> >       # It is now recommended to use strong params instead of  
''attr_accessible :enable, :controller_action_id, :role_id''
> >     end
> > 
> > controller_actions_controller.rb
> >     ...
> >       private
> >         # Use callbacks to share common setup or constraints between
actions.
> >         def set_controller_action
> >           @controller_action = ControllerAction.find(params[:id])
> >         end
> > 
> >         # Never trust parameters from the scary internet, only allow
the white list through.
> >         def controller_action_params
> >           params.require(:controller_action).permit!
> >         end
> > 
> > controller_actions view - excluding error code and most css
formatting.
> > _form.rb
> > 
> >     <%= form_for(@controller_action) do |f| %>
> >       ...
> >       <%= f.label :name %><br />
> >       <%= f.text_field :name %>
> >       
> >       <h2><%= f.label :role %></h2>
> >       <%= f.fields_for :interactions,
@controller_action.initialized_interactions() do |builder| %>
> >           <% role = builder.object.role %>
> >           <%= builder.hidden_field :role_id %>
> > 
> >           <%= builder.check_box :enable %>
> >           <%= builder.label :enable, role.name (http://role.name)
%>
> >  
> >       <% end %>
> > 
> >       <%= f.submit %>
> > 
> >     <% end %>
> > 
> > Under rails 3.2.11 I get a form that allows the user to edit roles.
> > Editing controller_action 
> > Name
> > Roles 
> > Webmaster 
> > Admin 
> > Moderator 
> > Editor 
> > Registered User 
> > Guest 
> > 
> > 
> > 
> > Show (http://localhost:3200/controller_actions/1) | Back
(http://localhost:3200/controller_actions)
> > 
> > Under Rails 4.0 you get:-
> > undefined method `role'' for #<Array:0xb875d4c> 
> > Extracted source (around line #21):
> > 
> > 18 19 20 21 22 23 24 
> > 
> > <div> 
> > <h2><%= f.label :role %></h2> 
> > <%= f.fields_for :interactions,
@controller_action.initialized_interactions() do |builder| %>
> > <% role = builder.object.role %> 
> > <%= builder.hidden_field :role_id %> 
> > 
> > <div class="field"> 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > Trace of template inclusion:
app/views/controller_actions/edit.html.erb
> > Rails.root: /home/john/RubyMineProjects/Rails/4.0/urps2
> > Application Trace (http://localhost:3100/controller_actions/1/edit#) |
Framework Trace (http://localhost:3100/controller_actions/1/edit#) | Full Trace
(http://localhost:3100/controller_actions/1/edit#)
> > app/views/controller_actions/_form.html.erb:21:in `block (2 levels) in
_app_views_controller_actions__form_html_erb__366592963_95670400''
actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in `block
in capture'' actionpack (4.0.0.beta1)
lib/action_view/helpers/capture_helper.rb:200:in `with_output_buffer''
actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
`capture'' actionpack (4.0.0.beta1)
lib/action_view/helpers/form_helper.rb:707:in `fields_for'' actionpack
(4.0.0.beta1) lib/action_view/helpers/form_helper.rb:1501:in
`fields_for'' app/views/controller_actions/_form.html.erb:20:in `block
in _app_views_controller_actions__form_html_erb__366592963_95670400''
actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in `block
in capture'' actionpack (4.0.0.beta1)
lib/action_view/helpers/capture_helper.rb:200:in `with_output_buffer''
actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
`capture'' actionpack (4.0.0.beta1) lib/action_view/helpers/form_helper.rb:435:in `form_for''
app/views/controller_actions/_form.html.erb:1:in
`_app_views_controller_actions__form_html_erb__366592963_95670400''
actionpack (4.0.0.beta1) lib/action_view/template.rb:143:in `block in
render'' activesupport (4.0.0.beta1)
lib/active_support/notifications.rb:160:in `instrument'' actionpack
(4.0.0.beta1) lib/action_view/template.rb:141:in `render'' actionpack
(4.0.0.beta1) lib/action_view/renderer/partial_renderer.rb:306:in
`render_partial'' actionpack (4.0.0.beta1)
lib/action_view/renderer/partial_renderer.rb:279:in `block in render''
actionpack (4.0.0.beta1) lib/action_view/renderer/abstract_renderer.rb:23:in
`block in instrument'' activesupport (4.0.0.beta1)
lib/active_support/notifications.rb:158:in `block in instrument''
activesupport (4.0.0.beta1)
lib/active_support/notifications/instrumenter.rb:20:in `instrument''
activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`instrument'' actionpack (4.0.0.beta1) lib/a
ction_view/renderer/abstract_renderer.rb:23:in `instrument'' actionpack
(4.0.0.beta1) lib/action_view/renderer/partial_renderer.rb:278:in
`render'' actionpack (4.0.0.beta1)
lib/action_view/renderer/renderer.rb:41:in `render_partial'' actionpack
(4.0.0.beta1) lib/action_view/helpers/rendering_helper.rb:27:in
`render'' app/views/controller_actions/edit.html.erb:3:in
`_app_views_controller_actions_edit_html_erb__785330494_92185850''
actionpack (4.0.0.beta1) lib/action_view/template.rb:143:in `block in
render'' activesupport (4.0.0.beta1)
lib/active_support/notifications.rb:160:in `instrument'' actionpack
(4.0.0.beta1) lib/action_view/template.rb:141:in `render'' actionpack
(4.0.0.beta1) lib/action_view/renderer/template_renderer.rb:49:in `block (2
levels) in render_template'' actionpack (4.0.0.beta1)
lib/action_view/renderer/abstract_renderer.rb:23:in `block in
instrument'' activesupport (4.0.0.beta1)
lib/active_support/notifications.rb:158:in `block in instrument''
activesupport (4.0.0.beta1) lib
/active_support/notifications/instrumenter.rb:20:in `instrument''
activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`instrument'' actionpack (4.0.0.beta1)
lib/action_view/renderer/abstract_renderer.rb:23:in `instrument''
actionpack (4.0.0.beta1) lib/action_view/renderer/template_renderer.rb:48:in
`block in render_template'' actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:56:in
`render_with_layout'' actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:47:in `render_template''
actionpack (4.0.0.beta1) lib/action_view/renderer/template_renderer.rb:17:in
`render'' actionpack (4.0.0.beta1)
lib/action_view/renderer/renderer.rb:36:in `render_template'' actionpack
(4.0.0.beta1) lib/action_view/renderer/renderer.rb:17:in `render''
actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:119:in
`_render_template'' actionpack (4.0.0.beta1)
lib/action_controller/metal/streaming.rb:219:in `_render_template''
actionpack (4.0.0.beta1) lib/abst
ract_controller/rendering.rb:112:in `render_to_body'' actionpack
(4.0.0.beta1) lib/action_controller/metal/rendering.rb:33:in
`render_to_body'' actionpack (4.0.0.beta1)
lib/action_controller/metal/renderers.rb:26:in `render_to_body''
actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:97:in
`render'' actionpack (4.0.0.beta1)
lib/action_controller/metal/rendering.rb:16:in `render'' actionpack
(4.0.0.beta1) lib/action_controller/metal/instrumentation.rb:41:in `block (2
levels) in render'' activesupport (4.0.0.beta1)
lib/active_support/core_ext/benchmark.rb:5:in `block in ms''
/home/john/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/benchmark.rb:296:in
`realtime'' activesupport (4.0.0.beta1)
lib/active_support/core_ext/benchmark.rb:5:in `ms'' actionpack
(4.0.0.beta1) lib/action_controller/metal/instrumentation.rb:41:in `block in
render'' actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:84:in
`cleanup_view_runtime'' activerecord (4.0.0.beta1)
lib/active_record/railties/c
ontroller_runtime.rb:24:in `cleanup_view_runtime'' actionpack
(4.0.0.beta1) lib/action_controller/metal/instrumentation.rb:40:in
`render'' actionpack (4.0.0.beta1)
lib/action_controller/metal/implicit_render.rb:10:in `default_render''
actionpack (4.0.0.beta1) lib/action_controller/metal/implicit_render.rb:5:in
`send_action'' actionpack (4.0.0.beta1)
lib/abstract_controller/base.rb:189:in `process_action'' actionpack
(4.0.0.beta1) lib/action_controller/metal/rendering.rb:10:in
`process_action'' actionpack (4.0.0.beta1)
lib/abstract_controller/callbacks.rb:18:in `block in process_action''
activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:413:in
`_run__68927184__process_action__callbacks'' activesupport (4.0.0.beta1)
lib/active_support/callbacks.rb:78:in `run_callbacks'' actionpack
(4.0.0.beta1) lib/abstract_controller/callbacks.rb:17:in
`process_action'' actionpack (4.0.0.beta1)
lib/action_controller/metal/rescue.rb:29:in `process_action'' actionpack
(4.0.0.beta1) lib/action_controller/
metal/instrumentation.rb:31:in `block in process_action'' activesupport
(4.0.0.beta1) lib/active_support/notifications.rb:158:in `block in
instrument'' activesupport (4.0.0.beta1)
lib/active_support/notifications/instrumenter.rb:20:in `instrument''
activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`instrument'' actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:30:in `process_action''
actionpack (4.0.0.beta1) lib/action_controller/metal/params_wrapper.rb:245:in
`process_action'' activerecord (4.0.0.beta1)
lib/active_record/railties/controller_runtime.rb:18:in `process_action''
actionpack (4.0.0.beta1) lib/abstract_controller/base.rb:136:in
`process'' actionpack (4.0.0.beta1)
lib/abstract_controller/rendering.rb:44:in `process'' actionpack
(4.0.0.beta1) lib/action_controller/metal.rb:196:in `dispatch''
actionpack (4.0.0.beta1) lib/action_controller/metal/rack_delegation.rb:13:in
`dispatch'' actionpack (4.0.0.beta1)
lib/action_controller/metal.rb:232:in `
block in action'' actionpack (4.0.0.beta1)
lib/action_dispatch/routing/route_set.rb:78:in `call'' actionpack
(4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:78:in `dispatch''
actionpack (4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:46:in
`call'' actionpack (4.0.0.beta1)
lib/action_dispatch/journey/router.rb:69:in `block in call'' actionpack
(4.0.0.beta1) lib/action_dispatch/journey/router.rb:57:in `each''
actionpack (4.0.0.beta1) lib/action_dispatch/journey/router.rb:57:in
`call'' actionpack (4.0.0.beta1)
lib/action_dispatch/routing/route_set.rb:651:in `call'' rack (1.5.2)
lib/rack/etag.rb:23:in `call'' rack (1.5.2)
lib/rack/conditionalget.rb:25:in `call'' rack (1.5.2)
lib/rack/head.rb:11:in `call'' actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/params_parser.rb:27:in `call'' actionpack
(4.0.0.beta1) lib/action_dispatch/middleware/flash.rb:241:in `call''
rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'' rack
(1.5.2) lib/rack/session/abstract/id.rb:220:in `call
'' actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/cookies.rb:452:in `call'' activerecord
(4.0.0.beta1) lib/active_record/query_cache.rb:36:in `call''
activerecord (4.0.0.beta1)
lib/active_record/connection_adapters/abstract/connection_pool.rb:632:in
`call'' activerecord (4.0.0.beta1) lib/active_record/migration.rb:348:in
`call'' actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/callbacks.rb:29:in `block in call''
activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:373:in
`_run__125207171__call__callbacks'' activesupport (4.0.0.beta1)
lib/active_support/callbacks.rb:78:in `run_callbacks'' actionpack
(4.0.0.beta1) lib/action_dispatch/middleware/callbacks.rb:27:in `call''
actionpack (4.0.0.beta1) lib/action_dispatch/middleware/reloader.rb:64:in
`call'' actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/remote_ip.rb:76:in `call'' actionpack
(4.0.0.beta1) lib/action_dispatch/middleware/debug_exceptions.rb:17:in
`call'' actionpack (4.0.0.beta1) lib/action_dispatch/middlewar
e/show_exceptions.rb:30:in `call'' railties (4.0.0.beta1)
lib/rails/rack/logger.rb:38:in `call_app'' railties (4.0.0.beta1)
lib/rails/rack/logger.rb:21:in `block in call'' activesupport
(4.0.0.beta1) lib/active_support/tagged_logging.rb:67:in `block in
tagged'' activesupport (4.0.0.beta1)
lib/active_support/tagged_logging.rb:25:in `tagged'' activesupport
(4.0.0.beta1) lib/active_support/tagged_logging.rb:67:in `tagged''
railties (4.0.0.beta1) lib/rails/rack/logger.rb:21:in `call'' actionpack
(4.0.0.beta1) lib/action_dispatch/middleware/request_id.rb:21:in `call''
rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'' rack (1.5.2)
lib/rack/runtime.rb:17:in `call'' activesupport (4.0.0.beta1)
lib/active_support/cache/strategy/local_cache.rb:72:in `call'' rack
(1.5.2) lib/rack/lock.rb:17:in `call'' actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/static.rb:64:in `call'' railties
(4.0.0.beta1) lib/rails/engine.rb:510:in `call'' railties (4.0.0.beta1)
lib/rails/application.rb:96:in `call'' railtie
s (4.0.0.beta1) lib/rails/railtie/configurable.rb:30:in
`method_missing'' unicorn (4.6.2) lib/unicorn/http_server.rb:552:in
`process_client'' unicorn (4.6.2) lib/unicorn/http_server.rb:632:in
`worker_loop'' unicorn (4.6.2) lib/unicorn/http_server.rb:500:in
`spawn_missing_workers'' unicorn (4.6.2)
lib/unicorn/http_server.rb:511:in `maintain_worker_count'' unicorn
(4.6.2) lib/unicorn/http_server.rb:277:in `join'' unicorn (4.6.2)
bin/unicorn_rails:209:in `<top (required)>''
/home/john/.rvm/gems/ruby-2.0.0-p0@rails-4/bin/unicorn_rails:23:in
`load''
/home/john/.rvm/gems/ruby-2.0.0-p0@rails-4/bin/unicorn_rails:23:in `<top
(required)>'' ruby-debug-ide (0.4.17.beta16)
lib/ruby-debug-ide.rb:86:in `debug_load'' ruby-debug-ide (0.4.17.beta16)
lib/ruby-debug-ide.rb:86:in `debug_program'' ruby-debug-ide
(0.4.17.beta16) bin/rdebug-ide:109:in `<top (required)>'' -e:1:in
`load'' -e:1:in `<main>''> > 
> > 
> > Request
> > Parameters:
> > {"id"=>"1"}
> > Toggle session dump (http://localhost:3100/controller_actions/1/edit#)
> > 
> > Toggle env dump (http://localhost:3100/controller_actions/1/edit#)
> > 
> > Response
> > Headers:
> > None
> > 
> > Sorry about the verbosity but I am really struggling to solve this
most basic use case.
> > 
> > I have tried to figure out why the form builder returns an array but
and would write my own if I could figure out how to.
> > 
> > Any help appreciated. 
> -- 
> You received this message because you are subscribed to the Google Groups
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jleake-xLhkCMTzzpz10XsdtD+oqA@public.gmane.org

2013-Mar-24 15:26 UTC

head link

Re: Rails 4.0 has_many_through and fields_for

Hi, That is what happens now in models/controller_action.rb

    def initialized_interactions() # this is the key method
      [].tap do |o|
        Role.all.each do |r|
          if p = interactions.find { |p| p.role_id == r.id }
            o << p.tap { |p| p.enable ||= true }
          else
            o << Interaction.new(:role_id => r.id)
          end
        end
      end
    end

In rails 3.2 it just works.  What should I return instead of an array ?

On Sunday, 24 March 2013 12:20:49 UTC,
jle...-xLhkCMTzzpz10XsdtD+oqA@public.gmane.org wrote:>
> Hi all, I am trying to reproduce rails 3.2 behaviour with fields_for and 
> nested attributes.
>
>     class ControllerAction < ActiveRecord::Base
>       has_many :interactions, dependent: :destroy
>       has_many :roles, through: :interactions
>
>       scope :controllers, lambda {|name| where("controller_name_id =
?",
> name)}
>       scope :actions, lambda {|name| where("action_name_id = ?",
name)}
>
>       def initialized_interactions() # this is the key method
>         [].tap do |o|
>           Role.all.each do |r|
>             if p = interactions.find { |p| p.role_id == r.id }
>               o << p.tap { |p| p.enable ||= true }
>             else
>               o << Interaction.new(:role_id => r.id)
>             end
>           end
>         end
>       end
>     end
>
>     class Role < ActiveRecord::Base
>       has_many :interactions
>     end
>
>     class Interaction < ActiveRecord::Base
>       belongs_to :controller_action
>       belongs_to :role
>       attr_accessor :enable # nice little thingy here
>       # It is now recommended to use strong params instead of   
> ''attr_accessible :enable, :controller_action_id,
:role_id''
>     end
>
> controller_actions_controller.rb
>     ...
>       private
>         # Use callbacks to share common setup or constraints between 
> actions.
>         def set_controller_action
>           @controller_action = ControllerAction.find(params[:id])
>         end
>
>         # Never trust parameters from the scary internet, only allow the 
> white list through.
>         def controller_action_params
>           params.require(:controller_action).permit!
>         end
>
> controller_actions view - excluding error code and most css formatting.
> _form.rb
>
>     <%= form_for(@controller_action) do |f| %>
>       ...
>       <%= f.label :name %><br />
>       <%= f.text_field :name %>
>       
>       <h2><%= f.label :role %></h2>
>       <%= f.fields_for :interactions, 
> @controller_action.initialized_interactions() do |builder| %>
>           <% role = builder.object.role %>
>           <%= builder.hidden_field :role_id %>
>
>           <%= builder.check_box :enable %>
>           <%= builder.label :enable, role.name %>
>  
>       <% end %>
>
>       <%= f.submit %>
>
>     <% end %>
>
> Under rails 3.2.11 I get a form that allows the user to edit roles.
> Editing controller_action 
> Name
>   Roles 
>  Webmaster 
>  Admin 
>  Moderator 
>  Editor 
>  Registered User 
>  Guest 
>   Show <http://localhost:3200/controller_actions/1> |
Back<http://localhost:3200/controller_actions>
>
> Under Rails 4.0 you get:-
>
> undefined method `role'' for #<Array:0xb875d4c>
>
>  Extracted source (around line *#21*):
>    
> 18192021222324
>           
>         <div>
>          <h2><%= f.label :role %></h2>
>          <%= f.fields_for :interactions,
@controller_action.initialized_interactions() do |builder| %>
>              <% role = builder.object.role %>
>              <%= builder.hidden_field :role_id %>
>                 <div class="field">
>
>    Trace of template inclusion: app/views/controller_actions/edit.html.erb
>
> Rails.root: /home/john/RubyMineProjects/Rails/4.0/urps2
>  Application Trace <http://localhost:3100/controller_actions/1/edit#>
| Framework
> Trace <http://localhost:3100/controller_actions/1/edit#> | Full
Trace<http://localhost:3100/controller_actions/1/edit#>
>
> app/views/controller_actions/_form.html.erb:21:in `block (2 levels) in
_app_views_controller_actions__form_html_erb__366592963_95670400''
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
`block in capture''
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:200:in
`with_output_buffer''
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
`capture''
> actionpack (4.0.0.beta1) lib/action_view/helpers/form_helper.rb:707:in
`fields_for''
> actionpack (4.0.0.beta1) lib/action_view/helpers/form_helper.rb:1501:in
`fields_for''
> app/views/controller_actions/_form.html.erb:20:in `block in
_app_views_controller_actions__form_html_erb__366592963_95670400''
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
`block in capture''
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:200:in
`with_output_buffer''
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
`capture''
> actionpack (4.0.0.beta1) lib/action_view/helpers/form_helper.rb:435:in
`form_for''
> app/views/controller_actions/_form.html.erb:1:in
`_app_views_controller_actions__form_html_erb__366592963_95670400''
> actionpack (4.0.0.beta1) lib/action_view/template.rb:143:in `block in
render''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:160:in
`instrument''
> actionpack (4.0.0.beta1) lib/action_view/template.rb:141:in
`render''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/partial_renderer.rb:306:in `render_partial''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/partial_renderer.rb:279:in `block in render''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/abstract_renderer.rb:23:in `block in
instrument''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`block in instrument''
> activesupport (4.0.0.beta1)
lib/active_support/notifications/instrumenter.rb:20:in `instrument''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`instrument''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/abstract_renderer.rb:23:in `instrument''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/partial_renderer.rb:278:in `render''
> actionpack (4.0.0.beta1) lib/action_view/renderer/renderer.rb:41:in
`render_partial''
> actionpack (4.0.0.beta1) lib/action_view/helpers/rendering_helper.rb:27:in
`render''
> app/views/controller_actions/edit.html.erb:3:in
`_app_views_controller_actions_edit_html_erb__785330494_92185850''
> actionpack (4.0.0.beta1) lib/action_view/template.rb:143:in `block in
render''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:160:in
`instrument''
> actionpack (4.0.0.beta1) lib/action_view/template.rb:141:in
`render''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:49:in `block (2 levels) in
render_template''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/abstract_renderer.rb:23:in `block in
instrument''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`block in instrument''
> activesupport (4.0.0.beta1)
lib/active_support/notifications/instrumenter.rb:20:in `instrument''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`instrument''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/abstract_renderer.rb:23:in `instrument''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:48:in `block in
render_template''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:56:in
`render_with_layout''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:47:in `render_template''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:17:in `render''
> actionpack (4.0.0.beta1) lib/action_view/renderer/renderer.rb:36:in
`render_template''
> actionpack (4.0.0.beta1) lib/action_view/renderer/renderer.rb:17:in
`render''
> actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:119:in
`_render_template''
> actionpack (4.0.0.beta1) lib/action_controller/metal/streaming.rb:219:in
`_render_template''
> actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:112:in
`render_to_body''
> actionpack (4.0.0.beta1) lib/action_controller/metal/rendering.rb:33:in
`render_to_body''
> actionpack (4.0.0.beta1) lib/action_controller/metal/renderers.rb:26:in
`render_to_body''
> actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:97:in
`render''
> actionpack (4.0.0.beta1) lib/action_controller/metal/rendering.rb:16:in
`render''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:41:in `block (2 levels) in
render''
> activesupport (4.0.0.beta1) lib/active_support/core_ext/benchmark.rb:5:in
`block in ms''
> /home/john/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/benchmark.rb:296:in
`realtime''
> activesupport (4.0.0.beta1) lib/active_support/core_ext/benchmark.rb:5:in
`ms''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:41:in `block in render''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:84:in
`cleanup_view_runtime''
> activerecord (4.0.0.beta1)
lib/active_record/railties/controller_runtime.rb:24:in
`cleanup_view_runtime''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:40:in `render''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/implicit_render.rb:10:in `default_render''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/implicit_render.rb:5:in `send_action''
> actionpack (4.0.0.beta1) lib/abstract_controller/base.rb:189:in
`process_action''
> actionpack (4.0.0.beta1) lib/action_controller/metal/rendering.rb:10:in
`process_action''
> actionpack (4.0.0.beta1) lib/abstract_controller/callbacks.rb:18:in `block
in process_action''
> activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:413:in
`_run__68927184__process_action__callbacks''
> activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:78:in
`run_callbacks''
> actionpack (4.0.0.beta1) lib/abstract_controller/callbacks.rb:17:in
`process_action''
> actionpack (4.0.0.beta1) lib/action_controller/metal/rescue.rb:29:in
`process_action''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:31:in `block in
process_action''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`block in instrument''
> activesupport (4.0.0.beta1)
lib/active_support/notifications/instrumenter.rb:20:in `instrument''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`instrument''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:30:in `process_action''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/params_wrapper.rb:245:in `process_action''
> activerecord (4.0.0.beta1)
lib/active_record/railties/controller_runtime.rb:18:in `process_action''
> actionpack (4.0.0.beta1) lib/abstract_controller/base.rb:136:in
`process''
> actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:44:in
`process''
> actionpack (4.0.0.beta1) lib/action_controller/metal.rb:196:in
`dispatch''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/rack_delegation.rb:13:in `dispatch''
> actionpack (4.0.0.beta1) lib/action_controller/metal.rb:232:in `block in
action''
> actionpack (4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:78:in
`call''
> actionpack (4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:78:in
`dispatch''
> actionpack (4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:46:in
`call''
> actionpack (4.0.0.beta1) lib/action_dispatch/journey/router.rb:69:in `block
in call''
> actionpack (4.0.0.beta1) lib/action_dispatch/journey/router.rb:57:in
`each''
> actionpack (4.0.0.beta1) lib/action_dispatch/journey/router.rb:57:in
`call''
> actionpack (4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:651:in
`call''
> rack (1.5.2) lib/rack/etag.rb:23:in `call''
> rack (1.5.2) lib/rack/conditionalget.rb:25:in `call''
> rack (1.5.2) lib/rack/head.rb:11:in `call''
> actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/params_parser.rb:27:in `call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/flash.rb:241:in
`call''
> rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context''
> rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/cookies.rb:452:in
`call''
> activerecord (4.0.0.beta1) lib/active_record/query_cache.rb:36:in
`call''
> activerecord (4.0.0.beta1)
lib/active_record/connection_adapters/abstract/connection_pool.rb:632:in
`call''
> activerecord (4.0.0.beta1) lib/active_record/migration.rb:348:in
`call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/callbacks.rb:29:in
`block in call''
> activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:373:in
`_run__125207171__call__callbacks''
> activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:78:in
`run_callbacks''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/callbacks.rb:27:in
`call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/reloader.rb:64:in
`call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/remote_ip.rb:76:in
`call''
> actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call''
> actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/show_exceptions.rb:30:in `call''
> railties (4.0.0.beta1) lib/rails/rack/logger.rb:38:in `call_app''
> railties (4.0.0.beta1) lib/rails/rack/logger.rb:21:in `block in
call''
> activesupport (4.0.0.beta1) lib/active_support/tagged_logging.rb:67:in
`block in tagged''
> activesupport (4.0.0.beta1) lib/active_support/tagged_logging.rb:25:in
`tagged''
> activesupport (4.0.0.beta1) lib/active_support/tagged_logging.rb:67:in
`tagged''
> railties (4.0.0.beta1) lib/rails/rack/logger.rb:21:in `call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/request_id.rb:21:in
`call''
> rack (1.5.2) lib/rack/methodoverride.rb:21:in `call''
> rack (1.5.2) lib/rack/runtime.rb:17:in `call''
> activesupport (4.0.0.beta1)
lib/active_support/cache/strategy/local_cache.rb:72:in `call''
> rack (1.5.2) lib/rack/lock.rb:17:in `call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/static.rb:64:in
`call''
> railties (4.0.0.beta1) lib/rails/engine.rb:510:in `call''
> railties (4.0.0.beta1) lib/rails/application.rb:96:in `call''
> railties (4.0.0.beta1) lib/rails/railtie/configurable.rb:30:in
`method_missing''
> unicorn (4.6.2) lib/unicorn/http_server.rb:552:in `process_client''
> unicorn (4.6.2) lib/unicorn/http_server.rb:632:in `worker_loop''
> unicorn (4.6.2) lib/unicorn/http_server.rb:500:in
`spawn_missing_workers''
> unicorn (4.6.2) lib/unicorn/http_server.rb:511:in
`maintain_worker_count''
> unicorn (4.6.2) lib/unicorn/http_server.rb:277:in `join''
> unicorn (4.6.2) bin/unicorn_rails:209:in `<top (required)>''
> /home/john/.rvm/gems/ruby-2.0.0-p0@rails-4/bin/unicorn_rails:23:in
`load''
> /home/john/.rvm/gems/ruby-2.0.0-p0@rails-4/bin/unicorn_rails:23:in `<top
(required)>''
> ruby-debug-ide (0.4.17.beta16) lib/ruby-debug-ide.rb:86:in
`debug_load''
> ruby-debug-ide (0.4.17.beta16) lib/ruby-debug-ide.rb:86:in
`debug_program''
> ruby-debug-ide (0.4.17.beta16) bin/rdebug-ide:109:in `<top
(required)>''
> -e:1:in `load''
> -e:1:in `<main>''
>
>  Request 
>
> *Parameters*:
>
> {"id"=>"1"}
>
>  Toggle session dump
<http://localhost:3100/controller_actions/1/edit#>
>  Toggle env dump <http://localhost:3100/controller_actions/1/edit#>
>  Response 
>
> *Headers*:
>
> None
>
>
> Sorry about the verbosity but I am really struggling to solve this most 
> basic use case.
>
> I have tried to figure out why the form builder returns an array but and 
> would write my own if I could figure out how to.
>
> Any help appreciated. 
>
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jleake-xLhkCMTzzpz10XsdtD+oqA@public.gmane.org

2013-Mar-27 16:26 UTC

head link

SOLVED - Re: Rails 4.0 has_many_through and fields_for

See https://github.com/ozpos/urps2 - use case 1

On Sunday, 24 March 2013 12:20:49 UTC,
jle...-xLhkCMTzzpz10XsdtD+oqA@public.gmane.org wrote:>
> Hi all, I am trying to reproduce rails 3.2 behaviour with fields_for and 
> nested attributes.
>
>     class ControllerAction < ActiveRecord::Base
>       has_many :interactions, dependent: :destroy
>       has_many :roles, through: :interactions
>
>       scope :controllers, lambda {|name| where("controller_name_id =
?",
> name)}
>       scope :actions, lambda {|name| where("action_name_id = ?",
name)}
>
>       def initialized_interactions() # this is the key method
>         [].tap do |o|
>           Role.all.each do |r|
>             if p = interactions.find { |p| p.role_id == r.id }
>               o << p.tap { |p| p.enable ||= true }
>             else
>               o << Interaction.new(:role_id => r.id)
>             end
>           end
>         end
>       end
>     end
>
>     class Role < ActiveRecord::Base
>       has_many :interactions
>     end
>
>     class Interaction < ActiveRecord::Base
>       belongs_to :controller_action
>       belongs_to :role
>       attr_accessor :enable # nice little thingy here
>       # It is now recommended to use strong params instead of   
> ''attr_accessible :enable, :controller_action_id,
:role_id''
>     end
>
> controller_actions_controller.rb
>     ...
>       private
>         # Use callbacks to share common setup or constraints between 
> actions.
>         def set_controller_action
>           @controller_action = ControllerAction.find(params[:id])
>         end
>
>         # Never trust parameters from the scary internet, only allow the 
> white list through.
>         def controller_action_params
>           params.require(:controller_action).permit!
>         end
>
> controller_actions view - excluding error code and most css formatting.
> _form.rb
>
>     <%= form_for(@controller_action) do |f| %>
>       ...
>       <%= f.label :name %><br />
>       <%= f.text_field :name %>
>       
>       <h2><%= f.label :role %></h2>
>       <%= f.fields_for :interactions, 
> @controller_action.initialized_interactions() do |builder| %>
>           <% role = builder.object.role %>
>           <%= builder.hidden_field :role_id %>
>
>           <%= builder.check_box :enable %>
>           <%= builder.label :enable, role.name %>
>  
>       <% end %>
>
>       <%= f.submit %>
>
>     <% end %>
>
> Under rails 3.2.11 I get a form that allows the user to edit roles.
> Editing controller_action 
> Name
>   Roles 
>  Webmaster 
>  Admin 
>  Moderator 
>  Editor 
>  Registered User 
>  Guest 
>   Show <http://localhost:3200/controller_actions/1> |
Back<http://localhost:3200/controller_actions>
>
> Under Rails 4.0 you get:-
>
> undefined method `role'' for #<Array:0xb875d4c>
>
>  Extracted source (around line *#21*):
>    
> 18192021222324
>           
>         <div>
>          <h2><%= f.label :role %></h2>
>          <%= f.fields_for :interactions,
@controller_action.initialized_interactions() do |builder| %>
>              <% role = builder.object.role %>
>              <%= builder.hidden_field :role_id %>
>                 <div class="field">
>
>    Trace of template inclusion: app/views/controller_actions/edit.html.erb
>
> Rails.root: /home/john/RubyMineProjects/Rails/4.0/urps2
>  Application Trace <http://localhost:3100/controller_actions/1/edit#>
| Framework
> Trace <http://localhost:3100/controller_actions/1/edit#> | Full
Trace<http://localhost:3100/controller_actions/1/edit#>
>
> app/views/controller_actions/_form.html.erb:21:in `block (2 levels) in
_app_views_controller_actions__form_html_erb__366592963_95670400''
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
`block in capture''
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:200:in
`with_output_buffer''
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
`capture''
> actionpack (4.0.0.beta1) lib/action_view/helpers/form_helper.rb:707:in
`fields_for''
> actionpack (4.0.0.beta1) lib/action_view/helpers/form_helper.rb:1501:in
`fields_for''
> app/views/controller_actions/_form.html.erb:20:in `block in
_app_views_controller_actions__form_html_erb__366592963_95670400''
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
`block in capture''
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:200:in
`with_output_buffer''
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
`capture''
> actionpack (4.0.0.beta1) lib/action_view/helpers/form_helper.rb:435:in
`form_for''
> app/views/controller_actions/_form.html.erb:1:in
`_app_views_controller_actions__form_html_erb__366592963_95670400''
> actionpack (4.0.0.beta1) lib/action_view/template.rb:143:in `block in
render''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:160:in
`instrument''
> actionpack (4.0.0.beta1) lib/action_view/template.rb:141:in
`render''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/partial_renderer.rb:306:in `render_partial''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/partial_renderer.rb:279:in `block in render''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/abstract_renderer.rb:23:in `block in
instrument''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`block in instrument''
> activesupport (4.0.0.beta1)
lib/active_support/notifications/instrumenter.rb:20:in `instrument''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`instrument''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/abstract_renderer.rb:23:in `instrument''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/partial_renderer.rb:278:in `render''
> actionpack (4.0.0.beta1) lib/action_view/renderer/renderer.rb:41:in
`render_partial''
> actionpack (4.0.0.beta1) lib/action_view/helpers/rendering_helper.rb:27:in
`render''
> app/views/controller_actions/edit.html.erb:3:in
`_app_views_controller_actions_edit_html_erb__785330494_92185850''
> actionpack (4.0.0.beta1) lib/action_view/template.rb:143:in `block in
render''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:160:in
`instrument''
> actionpack (4.0.0.beta1) lib/action_view/template.rb:141:in
`render''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:49:in `block (2 levels) in
render_template''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/abstract_renderer.rb:23:in `block in
instrument''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`block in instrument''
> activesupport (4.0.0.beta1)
lib/active_support/notifications/instrumenter.rb:20:in `instrument''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`instrument''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/abstract_renderer.rb:23:in `instrument''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:48:in `block in
render_template''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:56:in
`render_with_layout''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:47:in `render_template''
> actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:17:in `render''
> actionpack (4.0.0.beta1) lib/action_view/renderer/renderer.rb:36:in
`render_template''
> actionpack (4.0.0.beta1) lib/action_view/renderer/renderer.rb:17:in
`render''
> actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:119:in
`_render_template''
> actionpack (4.0.0.beta1) lib/action_controller/metal/streaming.rb:219:in
`_render_template''
> actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:112:in
`render_to_body''
> actionpack (4.0.0.beta1) lib/action_controller/metal/rendering.rb:33:in
`render_to_body''
> actionpack (4.0.0.beta1) lib/action_controller/metal/renderers.rb:26:in
`render_to_body''
> actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:97:in
`render''
> actionpack (4.0.0.beta1) lib/action_controller/metal/rendering.rb:16:in
`render''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:41:in `block (2 levels) in
render''
> activesupport (4.0.0.beta1) lib/active_support/core_ext/benchmark.rb:5:in
`block in ms''
> /home/john/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/benchmark.rb:296:in
`realtime''
> activesupport (4.0.0.beta1) lib/active_support/core_ext/benchmark.rb:5:in
`ms''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:41:in `block in render''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:84:in
`cleanup_view_runtime''
> activerecord (4.0.0.beta1)
lib/active_record/railties/controller_runtime.rb:24:in
`cleanup_view_runtime''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:40:in `render''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/implicit_render.rb:10:in `default_render''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/implicit_render.rb:5:in `send_action''
> actionpack (4.0.0.beta1) lib/abstract_controller/base.rb:189:in
`process_action''
> actionpack (4.0.0.beta1) lib/action_controller/metal/rendering.rb:10:in
`process_action''
> actionpack (4.0.0.beta1) lib/abstract_controller/callbacks.rb:18:in `block
in process_action''
> activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:413:in
`_run__68927184__process_action__callbacks''
> activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:78:in
`run_callbacks''
> actionpack (4.0.0.beta1) lib/abstract_controller/callbacks.rb:17:in
`process_action''
> actionpack (4.0.0.beta1) lib/action_controller/metal/rescue.rb:29:in
`process_action''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:31:in `block in
process_action''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`block in instrument''
> activesupport (4.0.0.beta1)
lib/active_support/notifications/instrumenter.rb:20:in `instrument''
> activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`instrument''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:30:in `process_action''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/params_wrapper.rb:245:in `process_action''
> activerecord (4.0.0.beta1)
lib/active_record/railties/controller_runtime.rb:18:in `process_action''
> actionpack (4.0.0.beta1) lib/abstract_controller/base.rb:136:in
`process''
> actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:44:in
`process''
> actionpack (4.0.0.beta1) lib/action_controller/metal.rb:196:in
`dispatch''
> actionpack (4.0.0.beta1)
lib/action_controller/metal/rack_delegation.rb:13:in `dispatch''
> actionpack (4.0.0.beta1) lib/action_controller/metal.rb:232:in `block in
action''
> actionpack (4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:78:in
`call''
> actionpack (4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:78:in
`dispatch''
> actionpack (4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:46:in
`call''
> actionpack (4.0.0.beta1) lib/action_dispatch/journey/router.rb:69:in `block
in call''
> actionpack (4.0.0.beta1) lib/action_dispatch/journey/router.rb:57:in
`each''
> actionpack (4.0.0.beta1) lib/action_dispatch/journey/router.rb:57:in
`call''
> actionpack (4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:651:in
`call''
> rack (1.5.2) lib/rack/etag.rb:23:in `call''
> rack (1.5.2) lib/rack/conditionalget.rb:25:in `call''
> rack (1.5.2) lib/rack/head.rb:11:in `call''
> actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/params_parser.rb:27:in `call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/flash.rb:241:in
`call''
> rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context''
> rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/cookies.rb:452:in
`call''
> activerecord (4.0.0.beta1) lib/active_record/query_cache.rb:36:in
`call''
> activerecord (4.0.0.beta1)
lib/active_record/connection_adapters/abstract/connection_pool.rb:632:in
`call''
> activerecord (4.0.0.beta1) lib/active_record/migration.rb:348:in
`call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/callbacks.rb:29:in
`block in call''
> activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:373:in
`_run__125207171__call__callbacks''
> activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:78:in
`run_callbacks''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/callbacks.rb:27:in
`call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/reloader.rb:64:in
`call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/remote_ip.rb:76:in
`call''
> actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call''
> actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/show_exceptions.rb:30:in `call''
> railties (4.0.0.beta1) lib/rails/rack/logger.rb:38:in `call_app''
> railties (4.0.0.beta1) lib/rails/rack/logger.rb:21:in `block in
call''
> activesupport (4.0.0.beta1) lib/active_support/tagged_logging.rb:67:in
`block in tagged''
> activesupport (4.0.0.beta1) lib/active_support/tagged_logging.rb:25:in
`tagged''
> activesupport (4.0.0.beta1) lib/active_support/tagged_logging.rb:67:in
`tagged''
> railties (4.0.0.beta1) lib/rails/rack/logger.rb:21:in `call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/request_id.rb:21:in
`call''
> rack (1.5.2) lib/rack/methodoverride.rb:21:in `call''
> rack (1.5.2) lib/rack/runtime.rb:17:in `call''
> activesupport (4.0.0.beta1)
lib/active_support/cache/strategy/local_cache.rb:72:in `call''
> rack (1.5.2) lib/rack/lock.rb:17:in `call''
> actionpack (4.0.0.beta1) lib/action_dispatch/middleware/static.rb:64:in
`call''
> railties (4.0.0.beta1) lib/rails/engine.rb:510:in `call''
> railties (4.0.0.beta1) lib/rails/application.rb:96:in `call''
> railties (4.0.0.beta1) lib/rails/railtie/configurable.rb:30:in
`method_missing''
> unicorn (4.6.2) lib/unicorn/http_server.rb:552:in `process_client''
> unicorn (4.6.2) lib/unicorn/http_server.rb:632:in `worker_loop''
> unicorn (4.6.2) lib/unicorn/http_server.rb:500:in
`spawn_missing_workers''
> unicorn (4.6.2) lib/unicorn/http_server.rb:511:in
`maintain_worker_count''
> unicorn (4.6.2) lib/unicorn/http_server.rb:277:in `join''
> unicorn (4.6.2) bin/unicorn_rails:209:in `<top (required)>''
> /home/john/.rvm/gems/ruby-2.0.0-p0@rails-4/bin/unicorn_rails:23:in
`load''
> /home/john/.rvm/gems/ruby-2.0.0-p0@rails-4/bin/unicorn_rails:23:in `<top
(required)>''
> ruby-debug-ide (0.4.17.beta16) lib/ruby-debug-ide.rb:86:in
`debug_load''
> ruby-debug-ide (0.4.17.beta16) lib/ruby-debug-ide.rb:86:in
`debug_program''
> ruby-debug-ide (0.4.17.beta16) bin/rdebug-ide:109:in `<top
(required)>''
> -e:1:in `load''
> -e:1:in `<main>''
>
>  Request 
>
> *Parameters*:
>
> {"id"=>"1"}
>
>  Toggle session dump
<http://localhost:3100/controller_actions/1/edit#>
>  Toggle env dump <http://localhost:3100/controller_actions/1/edit#>
>  Response 
>
> *Headers*:
>
> None
>
>
> Sorry about the verbosity but I am really struggling to solve this most 
> basic use case.
>
> I have tried to figure out why the form builder returns an array but and 
> would write my own if I could figure out how to.
>
> Any help appreciated. 
>
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