How do i work with nested model attributes in refinerycms?

Question

I have seen http://railscasts.com/episodes/196-nested-model-form-revised and tried the same doing with my refinery engine, but i am not able to see the nested fields in my form while adding a record from admin section and also I am not getting any errors. I am unable to figure out what exactly is happening or may be if i am missing any refinery related configuration thing.

I tried this on Rails Console:

 Refinery::Extension::Model.nested_attributes_options
 => {:nested_model_name=>{:allow_destroy=>false, :update_only=>false}}

I have 2 models Question and Option, but while submitting form for question with options as nested elements it is giving me Error as below

  ActiveModel::MassAssignmentSecurity::Error in  Refinery::Papers::Admin::QuestionsController#create

Can't mass-assign protected attributes: refinery_papers_options

Request

Parameters:

{"utf8"=>"✓", "authenticity_token"=>"TqL+r60R05+meVhPBXPPipvL+X3ZNx+3dCwoThFBn/Y=", "question"=>{"content"=>"
aaaaaaaaaa
", "correct_answers"=>"a", "refinery_papers_options"=>{"content"=>"
asdfghjklkmnv
", "_destroy"=>"0"}, "position"=>0}, "locale"=>:en}

My Models and view Are:

Question Model:

    module Refinery
     module Papers
     class Question < Refinery::Core::BaseModel

      self.table_name = 'refinery_papers_questions'

      attr_accessible :content, :correct_answers, :options_attributes, :position

      validates :content, :presence => true, :uniqueness => true

      has_many :options,
        :foreign_key => "refinery_papers_question_id",
        :class_name => "Refinery::Papers::Option",
        :dependent => :destroy

      accepts_nested_attributes_for :options,
        :allow_destroy => true

    end
  end
end 

Option Model:

    module Refinery
       module Papers
         class Option < Refinery::Core::BaseModel

           self.table_name = 'refinery_papers_options'

           attr_accessible :content, :position, :refinery_papers_question_id

           validates :content, :presence => true

           belongs_to :question,
            :class_name => 'Refinery::Papers::Question',
            :foreign_key => :refinery_papers_question_id

          end
        end
      end

In views Form for nested fields is like this :

<%= f.fields_for :refinery_papers_options do |option_form| %>
   <div class='field'>
     <%= option_form.label :content, "Option" %><br/>
     <%= option_form.text_area :content, :class => "wymeditor widest" %><br/>
    </div>
   <div class='field'>
     <%= option_form.label :_destroy, "Remove Option" -%>
     <%= option_form.check_box :_destroy -%>    
   </div>
 <% end %>

When i tried this on rails console i got this stack

2.0.0p247 :007 > Refinery::Papers::Question.create({"content"=>"
jhsdacnlkS
","correct_answers"=>"a", :refinery_papers_options => {"content"=>"
sjdfgczdj
"}}) ActiveModel::MassAssignmentSecurity::Error: Can't mass-assign protected attributes: refinery_papers_options from /home/vivek/.rvm/gems/ruby-2.0.0-p247@refinery/gems/activemodel-3.2.14/lib/active_model/mass_assignment_security/sanitizer.rb:48:in process_removed_attributes' from /home/vivek/.rvm/gems/ruby-2.0.0-p247@refinery/gems/activemodel-3.2.14/lib/active_model/mass_assignment_security/sanitizer.rb:20:indebug_protected_attribute_removal' from /home/vivek/.rvm/gems/ruby-2.0.0-p247@refinery/gems/activemodel-3.2.14/lib/active_model/mass_assignment_security/sanitizer.rb:12:in sanitize' from /home/vivek/.rvm/gems/ruby-2.0.0-p247@refinery/gems/activemodel-3.2.14/lib/active_model/mass_assignment_security.rb:230:insanitize_for_mass_assignment' from /home/vivek/.rvm/gems/ruby-2.0.0-p247@refinery/gems/activerecord-3.2.14/lib/active_record/attribute_assignment.rb:75:in assign_attributes' from /home/vivek/.rvm/gems/ruby-2.0.0-p247@refinery/gems/activerecord-3.2.14/lib/active_record/base.rb:498:ininitialize' from /home/vivek/.rvm/gems/ruby-2.0.0-p247@refinery/gems/activerecord-3.2.14/lib/active_record/persistence.rb:44:in new' from /home/vivek/.rvm/gems/ruby-2.0.0-p247@refinery/gems/activerecord-3.2.14/lib/active_record/persistence.rb:44:increate' from (irb):7 from /home/vivek/.rvm/gems/ruby-2.0.0-p247@refinery/gems/railties-3.2.14/lib/rails/commands/console.rb:47:in start' from /home/vivek/.rvm/gems/ruby-2.0.0-p247@refinery/gems/railties-3.2.14/lib/rails/commands/console.rb:8:instart' from /home/vivek/.rvm/gems/ruby-2.0.0-p247@refinery/gems/railties-3.2.14/lib/rails/commands.rb:41:in <top (required)>' from script/rails:6:inrequire' from script/rails:6:in `'

i dint got any error.It was working as fine and same as it was before but was not ale to see the nested attributes. — vivekporwal04
@RajarshiDas hey now i am able to see the fields in views but after submitting the form its giving me mass assignment error for options can help with that. — vivekporwal04
sorry for late reply .....if you use rails 4 use strong_parameter or if rails 3.2 use attr_accessible :name #all fields in your model which are assigned by also another solution config.active_record.whitelist_attributes = true see the link whitelist — Rajarshi Das
@RajarshiDas thanks for reply,i have already done what you are advising, you can check the models code and views code which i have posted above,but instead of that i am getting the mass assignment problem. — vivekporwal04

Ahmad hamza Ahmad hamza · Accepted Answer · 2013-09-04T11:14:34

May be this link can help.

 has_many :parts,
         :foreign_key => :refinery_page_id,
         :class_name => '::Refinery::PagePart',
         :order => 'position ASC',
         :inverse_of => :page,
         :dependent => :destroy,
         :include => ((:translations) if ::Refinery::PagePart.respond_to?(:translation_class))

accepts_nested_attributes_for :parts, :allow_destroy => true

There may be confusion regarding the class names of different models you have created in the engine. This above code is just a piece of example how the refinery core team have done the nested attributes concept.

How do i work with nested model attributes in refinerycms?

1 Answers