Issues with eager loading

[aaronchi]

I'm having problems with this gem and nested fields. When rails queries the object that's loaded into a fields_for it comes back with the association class instead of the model class.

I think that this may be related to what the fields_for_nested_model function is getting back when it calls object.to_model on the association.

[ernie]

Can you provide sample code to reproduce the problem?

[ernie]

Additionally, can you confirm this issue is with metawhere, and not metasearch? The emphasis on the view makes it sound more like a metasearch ticket.

[aaronchi]

Yes. I had meta_search installed and the error only happens if I add meta_where. Additionally, the problem happens with just meta_where installed.

The issue is pretty simple to duplicate. Just create a form with nested_fields on a model that accepts_nested_attributes_for

class Contact < ActiveRecord::Base
    has_many :phone_numbers, :as => :owner, :dependent => :destroy
    accepts_nested_attributes_for :phone_numbers, :allow_destroy => true
end

<%= form_for @contact do |f| %>
    <%= f.fields_for :phone_numbers do |pf| %>
      <%= pf.text_field :number %>
    <% end %>
<% end %>

The error I get here is:
undefined method `persisted?' for #Class:0x6da6028

But the real problem is that it's returning the wrong class for the object.

The class returned is ActiveRecord::Associations::HasManyAssociation instead of the PhoneNumber model

[ernie]

Thanks for the clarification. I found the problem. There are two solutions at this point:

1. Remove the definition of Symbol#=~ in core_ext/symbol.rb
2. Apply the patch to Rails I just put in at https://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/4513

More details are there.