Rails - Mar 2012 - nested attribute relationship never renders in form

Hey all,

I tried following this railscasts:

http://railscasts.com/episodes/196-nested-model-form-part-1

But there is one significant difference from what that does and what I
am trying to do. That builds a relationship to one object. In my form,
i have a list of objects and want to build relationship for each item
in list.

class Rule  < ActiveRecord::Base
  has_many :notification_emails, :dependent => :destroy
  accepts_nested_attributes_for :notification_emails, :reject_if =>
lambda { |notification| notification[:email].blank? }
end

class NotificationEmail < ActiveRecord::Base
  belongs_to :rule
end

#home_controller

def rules_config
      ...
      @rules = rules.flatten
      @rules.each { |a| a.notification_emails.build }

      render :partial => ''home/rules_config'', :layout =>
false
end

#home/rules_config.html.haml

#config
  .form_content
    = form_for "rule[]", ''/home/save_rules/'' +
@unit.id.to_s, :remote
=> true, :class => ''ajaxCall'' do |f|
      %table.scrollTable{:cellspacing => "0", :width =>
"740px", :style => "border-collapse: collapse; border-spacing:
0;"}
        %thead.fixedHeader
          %tr
            %th Rules
            %th Enable
            %th Email
            %th Notification Emails
        %tbody.scrollContent
          - for rule in @rules
            %tr
              %td= rule.rule_code.name
              %td= check_box_tag "enabled_ids[]", rule.id
              %td= f.text_field :email, :value => rule.email, :index
=> rule.id
              %td
                - f.fields_for :notification_emails do |notification|
                  = notification.text_area :email, :rows => 1

Basically I have a list of rules that a user can edit and then update
in this form. But each rule can have many notification emails and
since I built an association in controller, I expect this cell to
contain a text area field that links the relatonship. But the text
area field never displays.

thanks for response

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Depending on which Rails version you''re using, you might need to
change:

- f.fields_for :notification_emails do |notification| 

to:

= f.fields_for :notification_emails do |notification| 

(notice the = change)

Steve


On Friday, March 16, 2012 9:02:35 PM UTC, John Merlino
wrote:
>
> Hey all, 
>
> I tried following this railscasts: 
>
> http://railscasts.com/episodes/196-nested-model-form-part-1 
>
> But there is one significant difference from what that does and what I 
> am trying to do. That builds a relationship to one object. In my form, 
> i have a list of objects and want to build relationship for each item 
> in list. 
>
> class Rule  < ActiveRecord::Base 
>   has_many :notification_emails, :dependent => :destroy 
>   accepts_nested_attributes_for :notification_emails, :reject_if => 
> lambda { |notification| notification[:email].blank? } 
> end 
>
> class NotificationEmail < ActiveRecord::Base 
>   belongs_to :rule 
> end 
>
> #home_controller 
>
> def rules_config 
>       ... 
>       @rules = rules.flatten 
>       @rules.each { |a| a.notification_emails.build } 
>
>       render :partial => ''home/rules_config'', :layout
=> false
> end 
>
> #home/rules_config.html.haml 
>
> #config 
>   .form_content 
>     = form_for "rule[]", ''/home/save_rules/'' +
@unit.id.to_s, :remote
> => true, :class => ''ajaxCall'' do |f| 
>       %table.scrollTable{:cellspacing => "0", :width => 
> "740px", :style => "border-collapse: collapse;
border-spacing: 0;"}
>         %thead.fixedHeader 
>           %tr 
>             %th Rules 
>             %th Enable 
>             %th Email 
>             %th Notification Emails 
>         %tbody.scrollContent 
>           - for rule in @rules 
>             %tr 
>               %td= rule.rule_code.name 
>               %td= check_box_tag "enabled_ids[]", rule.id 
>               %td= f.text_field :email, :value => rule.email, :index 
> => rule.id 
>               %td 
>                 - f.fields_for :notification_emails do |notification| 
>                   = notification.text_area :email, :rows => 1 
>
> Basically I have a list of rules that a user can edit and then update 
> in this form. But each rule can have many notification emails and 
> since I built an association in controller, I expect this cell to 
> contain a text area field that links the relatonship. But the text 
> area field never displays. 
>
> thanks for response
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