Rails - May 2011 - [Form Helpers] Collection_select multiple and accepts_nested_attributes_for

Hello, I''m triying to set a form but I''m having problems.These
are my
models:

class Post < ActiveRecord::Base
  has_many :taggings, :dependent => :destroy
  has_many :tags, :through => :taggings
  accepts_nested_attributes_for :taggings, :limit => 3
end

class Tag < ActiveRecord::Base
  has_many :taggings, :dependent => :destroy
  has_many :posts, :through => :taggings
end

class Tagging < ActiveRecord::Base
  belongs_to :advert
  belongs_to :tag
end

In my view posts/_form.html.erb:
<%= form_for @post do |f| %>
  <%= f.fields_for :taggings do |t| %>
    <% t.collection_select :tag_id, Tag.all, :id, :name, { :selected
=> @post.tag_ids }, { :multiple => true } %>
  <% end %>
<% end %>

The problem is that I want a MULTIPLE select control for this
application but that seems incompatible with the
accepts_nested_attributes_for is expected. This control return an
array of options selected, like this:
- One option selected ==>
"post"=>{"taggings_attributes"=>{"0"=>{"tag_id"=>["1"]}}}
- Two options selected ==>
"post"=>{"taggings_attributes"=>{"0"=>{"tag_id"=>["1","2"]}}}

Instead, the accepts_nested_attributes_for is expected something like
this:
- One option selected ==>
"post"=>{"taggings_attributes"=>{"0"=>{"tag_id"=>"1"}}}
- Two options selected ==>
"post"=>{"taggings_attributes"=>{"0"=>{"tag_id"=>"1"},"1"=>{"tag_id"=>"2"}}}

I''m already clouded with this. One solution is to use a
collection_select control without multiple but I hope may have other
better solution.

Thanks very much. Daniel.

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Other solution is change the params hash for setup like
accepts_nested_attributes_for is expecting. I don''t know which is the
best solution for do it. In short, I want to create multiple nested
objects by selecting from a list.

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How about using ryanb''s nested_form gem? Should work well for your
case.

-cpr


On May 15, 3:18 am, danimashu
<daniel.madrid.re...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Other solution is change the params hash for setup like
> accepts_nested_attributes_for is expecting. I don''t know which is
the
> best solution for do it. In short, I want to create multiple nested
> objects by selecting from a list.
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Thanks cpr. It isn''t work for multiple select control but It''s
okey
for a classic select.

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Try this:

<%= collection_select(:taggings, :tag_ids, Tag.find(:all), :id, :name, 
{}, {:multiple => true}) %>

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