Rails - Dec 2011 - problema has_many + accepts_nested_attributes_for

Hi, I have one relationship ONE to N and need to populate the N in the
same form that have "Ad" model.
Below is my code from this problem...
I need to create a few checkbox populated using model "Options" and
what was selected by user need to save into model "OptionAnswer" that
is related with "Ad" model.
If I was too much confusing please say it and I''ll try to explain in
another way.

Thanks

--- models
class Ad < ActiveRecord::Base
	has_many :optionanswers, :class_name => "OptionAnswer",
:foreign_key
=> "ad_id", :dependent => :destroy

	accepts_nested_attributes_for :optionanswers
end

class OptionAnswer < ActiveRecord::Base
  belongs_to :ad
  belongs_to :option
end

class Option < ActiveRecord::Base
  has_many :optionanswer
end

--- controller
  def new
    @ad = Ad.new
    @ad.optionanswers.build
  end

--- view
<%= form_for(@ad, :url => { :action => "create" }) do |f|
%>

  <% f.fields_for :optionanswers do |build_answer| %>

	<% for option_a in Option.find(:all, :conditions => {:option_type_id
=> 2}) %>

	  <div>
		<%= build_answer.check_box :option_id option_a.id
%>&nbsp;<%option_a.text %>
	  </div>

    <% end %>

  <% end %>

<% end %>

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On Dec 11, 1:19 am, Sp4wnX
<celestinor...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hi, I have one relationship ONE to N and need to populate the N in the
> same form that have "Ad" model.
> Below is my code from this problem...
> I need to create a few checkbox populated using model "Options"
and
> what was selected by user need to save into model "OptionAnswer"
that
> is related with "Ad" model.
> If I was too much confusing please say it and I''ll try to explain
in
> another way.
So Ad has_many options, :through => :optionanswers?
If you want the user to pick only from existing options, then you
don''t actually need nested_attributes - create checkboxes with a name
of ad[option_ids][] and whose values are the ids of the options.

This works because with a has many through, you get an option_idsmethod

Fred
>
> Thanks
>
> --- models
> class Ad < ActiveRecord::Base
>         has_many :optionanswers, :class_name =>
"OptionAnswer", :foreign_key
> => "ad_id", :dependent => :destroy
>
>         accepts_nested_attributes_for :optionanswers
> end
>
> class OptionAnswer < ActiveRecord::Base
>   belongs_to :ad
>   belongs_to :option
> end
>
> class Option < ActiveRecord::Base
>   has_many :optionanswer
> end
>
> --- controller
>   def new
>     @ad = Ad.new
>     @ad.optionanswers.build
>   end
>
> --- view
> <%= form_for(@ad, :url => { :action => "create" }) do
|f| %>
>
>   <% f.fields_for :optionanswers do |build_answer| %>
>
>         <% for option_a in Option.find(:all, :conditions =>
{:option_type_id
> => 2}) %>
>
>           <div>
>                 <%= build_answer.check_box :option_id option_a.id
%>&nbsp;<%> option_a.text %>
>           </div>
>
>     <% end %>
>
>   <% end %>
>
> <% end %>
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--- MODELS
class Ad < ActiveRecord::Base
	belongs_to :user
	has_many :options, :through => :optionanswers
end

class OptionAnswer < ActiveRecord::Base
  belongs_to :ad
  belongs_to :option
end

class Option < ActiveRecord::Base
  belongs_to :optiontype
  has_many :ads, :through => :optionanswers
end

--- CONTROLLER
  def create
    @ad = Ad.new(params[:ad])

    if @ad.save
      flash[:success] = "Ads saved with success!"
      redirect_to @ad
    else
      render ''new''
    end
  end

--- VIEW (parts important)
  <% for option_a in Option.find(:all, :conditions => {:option_type_id
=> 2}) %>
	<div>
	  <%= check_box_tag "ad[option_ids][]", option_a.id
%>&nbsp;<%option_a.text %>
	</div>
<% end %>



---- ERROR
ActiveRecord::HasManyThroughAssociationNotFoundError in
EscortController#create

Could not find the association :optionanswers in model Ad
Rails.root: /Users/celestinoruas/Documents/Dropbox/railsprojects/
clasisex3

Application Trace | Framework Trace | Full Trace
app/controllers/escort_controller.rb:27:in `new''
app/controllers/escort_controller.rb:27:in `create''


If you can help me I''ll be great full.

Regards



On Dec 11, 12:35 pm, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On Dec 11, 1:19 am, Sp4wnX
<celestinor...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > Hi, I have one relationship ONE to N and need to populate the N in the
> > same form that have "Ad" model.
> > Below is my code from this problem...
> > I need to create a few checkbox populated using model
"Options" and
> > what was selected by user need to save into model
"OptionAnswer" that
> > is related with "Ad" model.
> > If I was too much confusing please say it and I''ll try to
explain in
> > another way.
>
> So Ad has_many options, :through => :optionanswers?
> If you want the user to pick only from existing options, then you
> don''t actually need nested_attributes - create checkboxes with a
name
> of ad[option_ids][] and whose values are the ids of the options.
>
> This works because with a has many through, you get an option_ids>
method
>
> Fred
>
>
>
>
>
>
>
>
>
> > Thanks
>
> > --- models
> > class Ad < ActiveRecord::Base
> >         has_many :optionanswers, :class_name =>
"OptionAnswer", :foreign_key
> > => "ad_id", :dependent => :destroy
>
> >         accepts_nested_attributes_for :optionanswers
> > end
>
> > class OptionAnswer < ActiveRecord::Base
> >   belongs_to :ad
> >   belongs_to :option
> > end
>
> > class Option < ActiveRecord::Base
> >   has_many :optionanswer
> > end
>
> > --- controller
> >   def new
> >     @ad = Ad.new
> >     @ad.optionanswers.build
> >   end
>
> > --- view
> > <%= form_for(@ad, :url => { :action => "create" })
do |f| %>
>
> >   <% f.fields_for :optionanswers do |build_answer| %>
>
> >         <% for option_a in Option.find(:all, :conditions =>
{:option_type_id
> > => 2}) %>
>
> >           <div>
> >                 <%= build_answer.check_box :option_id option_a.id
%>&nbsp;<%> > option_a.text %>
> >           </div>
>
> >     <% end %>
>
> >   <% end %>
>
> > <% end %>
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On Dec 11, 11:38 pm, Sp4wnX
<celestinor...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> ---- ERROR
> ActiveRecord::HasManyThroughAssociationNotFoundError in
> EscortController#create
>
> Could not find the association :optionanswers in model Ad
> Rails.root: /Users/celestinoruas/Documents/Dropbox/railsprojects/
> clasisex3
Like the error message says, you still need the optionanswers
association.

Fred

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Hi, worked, thanks a lot.

Regards

On Dec 12, 2011, at 8:31 AM, Frederick Cheung wrote:
> 
> 
> On Dec 11, 11:38 pm, Sp4wnX
<celestinor...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> 
>> 
>> ---- ERROR
>> ActiveRecord::HasManyThroughAssociationNotFoundError in
>> EscortController#create
>> 
>> Could not find the association :optionanswers in model Ad
>> Rails.root: /Users/celestinoruas/Documents/Dropbox/railsprojects/
>> clasisex3
> 
> Like the error message says, you still need the optionanswers
> association.
> 
> Fred
> 
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> 
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