thr3ads.net - Rails - has many through button [Dec 2007]

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Thufir

2007-Dec-31 06:07 UTC

has many through button

I''m working on three files to get a button working:

http://strawr.googlecode.com/svn/trunk/app/controllers/
categories_controller.rb

http://strawr.googlecode.com/svn/trunk/app/helpers/application_helper.rb

http://strawr.googlecode.com/svn/trunk/app/views/feeds/show.rhtml


so that when navigating to http://localhost:3000/feeds/show/2 there''s a
drop down list of all Category objects (this works).  I want to be able 
to click on the "record" button so that it captures the feed_id, in
this
case "2", and also the category_id from the drop-down list.

Currently clicking on this button as described will generate:

 ActiveRecord::RecordNotFound in FeedsController#record

Couldn''t find Feed without an ID

RAILS_ROOT: ./script/../config/..
Application Trace | Framework Trace | Full Trace

/usr/lib/ruby/gems/1.8/gems/activerecord-1.15.5/lib/active_record/
base.rb:1012:in `find_from_ids''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.15.5/lib/active_record/
base.rb:419:in `find''
/home/thufir/Desktop/strawr/app/controllers/feeds_controller.rb:54:in 
`record''

/usr/lib/ruby/gems/1.8/gems/activerecord-1.15.5/lib/active_record/
base.rb:1012:in `find_from_ids''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.15.5/lib/active_record/
base.rb:419:in `find''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
base.rb:1101:in `send''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
base.rb:1101:in `perform_action_without_filters''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
filters.rb:696:in `call_filters''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
filters.rb:688:in `perform_action_without_benchmark''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
benchmarking.rb:66:in `perform_action_without_rescue''
/usr/lib/ruby/1.8/benchmark.rb:293:in `measure''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
benchmarking.rb:66:in `perform_action_without_rescue''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
rescue.rb:83:in `perform_action''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
base.rb:435:in `send''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
base.rb:435:in `process_without_filters''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
filters.rb:684:in `process_without_session_management_support''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
session_management.rb:114:in `process''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
base.rb:334:in `process''
/usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/dispatcher.rb:41:in
`dispatch''
/usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/webrick_server.rb:113:in 
`handle_dispatch''
/usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/webrick_server.rb:79:in 
`service''
/usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service''
/usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run''
/usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread''
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start''
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread''
/usr/lib/ruby/1.8/webrick/server.rb:95:in `start''
/usr/lib/ruby/1.8/webrick/server.rb:92:in `each''
/usr/lib/ruby/1.8/webrick/server.rb:92:in `start''
/usr/lib/ruby/1.8/webrick/server.rb:23:in `start''
/usr/lib/ruby/1.8/webrick/server.rb:82:in `start''
/usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/webrick_server.rb:63:in 
`dispatch''
/usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/commands/servers/webrick.rb:59
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`gem_original_require''
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require''
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.4/lib/active_support/
dependencies.rb:495:in `require''
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.4/lib/active_support/
dependencies.rb:342:in `new_constants_in''
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.4/lib/active_support/
dependencies.rb:495:in `require''
/usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/commands/server.rb:39
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`gem_original_require''
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require''
script/server:3

/usr/lib/ruby/gems/1.8/gems/activerecord-1.15.5/lib/active_record/
base.rb:1012:in `find_from_ids''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.15.5/lib/active_record/
base.rb:419:in `find''
/home/thufir/Desktop/strawr/app/controllers/feeds_controller.rb:54:in 
`record''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
base.rb:1101:in `send''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
base.rb:1101:in `perform_action_without_filters''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
filters.rb:696:in `call_filters''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
filters.rb:688:in `perform_action_without_benchmark''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
benchmarking.rb:66:in `perform_action_without_rescue''
/usr/lib/ruby/1.8/benchmark.rb:293:in `measure''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
benchmarking.rb:66:in `perform_action_without_rescue''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
rescue.rb:83:in `perform_action''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
base.rb:435:in `send''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
base.rb:435:in `process_without_filters''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
filters.rb:684:in `process_without_session_management_support''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
session_management.rb:114:in `process''
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/
base.rb:334:in `process''
/usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/dispatcher.rb:41:in
`dispatch''
/usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/webrick_server.rb:113:in 
`handle_dispatch''
/usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/webrick_server.rb:79:in 
`service''
/usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service''
/usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run''
/usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread''
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start''
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread''
/usr/lib/ruby/1.8/webrick/server.rb:95:in `start''
/usr/lib/ruby/1.8/webrick/server.rb:92:in `each''
/usr/lib/ruby/1.8/webrick/server.rb:92:in `start''
/usr/lib/ruby/1.8/webrick/server.rb:23:in `start''
/usr/lib/ruby/1.8/webrick/server.rb:82:in `start''
/usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/webrick_server.rb:63:in 
`dispatch''
/usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/commands/servers/webrick.rb:59
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`gem_original_require''
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require''
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.4/lib/active_support/
dependencies.rb:495:in `require''
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.4/lib/active_support/
dependencies.rb:342:in `new_constants_in''
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.4/lib/active_support/
dependencies.rb:495:in `require''
/usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/commands/server.rb:39
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`gem_original_require''
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require''
script/server:3

Request

Parameters: None

Show session dump

--- 
flash: !map:ActionController::Flash::FlashHash {}


Response
Headers: {"cookie"=>[],
"Cache-Control"=>"no-cache"}






The relationship between the tables:

thufir@arrakis ~/Desktop/strawr $ 
thufir@arrakis ~/Desktop/strawr $ cat app/models/category.rb
class Category < ActiveRecord::Base
        has_many :tags
        has_many :feeds, :through => :tags
end
thufir@arrakis ~/Desktop/strawr $                           
thufir@arrakis ~/Desktop/strawr $ cat app/models/feed.rb    
class Feed < ActiveRecord::Base
        has_many :tags
        has_many :categories, :through => :tags
end
thufir@arrakis ~/Desktop/strawr $ 
thufir@arrakis ~/Desktop/strawr $ cat app/models/tag.rb  
class Tag < ActiveRecord::Base
        belongs_to :category
        belongs_to :feed

end
thufir@arrakis ~/Desktop/strawr $ 




thanks,

Thufir


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Thufir

2007-Dec-31 12:08 UTC

head link

Re: has many through button

On Mon, 31 Dec 2007 06:07:08 +0000, Thufir wrote:

> so that when navigating to http://localhost:3000/feeds/show/2
there''s a
> drop down list of all Category objects (this works).
Please ignore my previous post, I''ve gone in a totally different 
direction.

While the follow tutorial is certainly dated, it''s precisely what I
want
to do:

"2. View
To allow our web visitors to relate an expense with many tags, we are 
going to use multiple checkboxes. This is how it will look."
http://jrhicks.net/96

For my project, it''s relating a feed with many tags; otherwise
I''m aiming
for exactly what''s described in the PDF of the above link.

So, I used svn to roll back a bit and start over.  Here''s where
I''m at:

 NoMethodError in Feeds#edit

Showing app/views/feeds/_form.rhtml where line #9 raised:

You have a nil object when you didn''t expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.each

Extracted source (around line #9): 

http://strawr.googlecode.com/svn/trunk/app/views/feeds/_form.rhtml

Prior to editing _form.rhmtl the basic CRUD actions for the db were 
vanilla, but worked.

thanks,

Thufir

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Rails - Dec 2007 - has many through button

has many through button

Re: has many through button