Nested polymorphic

[Tuckie]

I'm attempting to have a nested polymorphic has_many with:

class Promotion < ActiveRecord::Base
  belongs_to :promotable, :polymorphic => true, :inverse_of => :promotions
  attr_accessible :promotable_id, :promotable_type 
end
class Page < ActiveRecord::Base
  has_many :promotions, :as => :promotable, :inverse_of => :promotable, :dependent => :destroy
  accepts_nested_attributes_for :promotions, :allow_destroy => true
  attr_accessible :promotions_attributes, :allow_destroy => true
end
class Offering < ActiveRecord::Base
  has_many :promotions, :as => :promotable, :inverse_of => :promotable, :dependent => :destroy
  accepts_nested_attributes_for :promotions, :allow_destroy => true
  attr_accessible :promotions_attributes, :allow_destroy => true
end

I would like to have a nested form within each page or offering, but I'm getting

undefined method `abstract_model' for #<Array:0x00000004c6e130>
...
/usr/local/rvm/gems/ruby-1.9.3-p0/bundler/gems/rails_admin-f20879f82ea0/app/helpers/rails_admin/form_builder.rb:47:in `field_wrapper_for'
/usr/local/rvm/gems/ruby-1.9.3-p0/bundler/gems/rails_admin-f20879f82ea0/app/helpers/rails_admin/form_builder.rb:37:in `block (2 levels) in fieldset_for'
/usr/local/rvm/gems/ruby-1.9.3-p0/bundler/gems/rails_admin-f20879f82ea0/app/helpers/rails_admin/form_builder.rb:37:in `map'
/usr/local/rvm/gems/ruby-1.9.3-p0/bundler/gems/rails_admin-f20879f82ea0/app/helpers/rails_admin/form_builder.rb:37:in `block in fieldset_for'
actionpack (3.2.3) lib/action_view/helpers/capture_helper.rb:40:in `block in capture'
actionpack (3.2.3) lib/action_view/helpers/capture_helper.rb:187:in `with_output_buffer'
haml (3.1.7) lib/haml/helpers/xss_mods.rb:109:in `with_output_buffer_with_haml_xss'
actionpack (3.2.3) lib/action_view/helpers/capture_helper.rb:40:in `capture'
haml (3.1.7) lib/haml/helpers/action_view_mods.rb:105:in `capture_with_haml'
actionpack (3.2.3) lib/action_view/helpers/tag_helper.rb:95:in `content_tag'
haml (3.1.7) lib/haml/helpers/action_view_mods.rb:123:in `content_tag_with_haml'

[bbenezech]

There is no support for nested polymorphics at the moment. I am not sure what it would involve. I'll investigate.

[Tuckie]

Much thanks!

[brett-bender]

+1 This was working as of v0.0.5 and is a must-have feature for us. I was sad to see this error on upgrading my installed version.

[michaek]

I've looked at this a little, and it seems like there's been a slight regression that's causing this error for me.

When nesting an associated model, :inverse_of is meant to hide the field that represents the current association (that the nested model will be saved into). That seems to not be the case for the polymorphic association that I'm testing with - when I exclude that field in the nested block, I no longer get the above error and my models persist correctly.

Hope that helps in tracking down the issue!

[billguy]

@michaek is correct. This fixed my issue.

config.model Document do
    include_all_fields
    nested do
      field :documentable do
        visible false
      end
    end
  end

[chrisbloom7]

This setup worked for me.

class Note < ActiveRecord::Base
  belongs_to :notable, polymorphic: true # do not specify inverse_of, else rails_admin borks

  rails_admin do
    nested do
      field :text

      field :user do
        visible false
      end

      field :notable do
        visible false
      end

      field :user_id, :hidden do
        visible true
        help ""
        default_value do
          bindings[:view]._current_user.id
        end
      end
    end
  end
end


class Material < ActiveRecord::Base
  has_many :notes, :as => :notable, inverse_of: :notable
  accepts_nested_attributes_for :notes, 
    reject_if: proc { |attributes| attributes['text'].blank? },
    allow_destroy: true

  rails_admin do
    edit do
      group "Form" do
        field :notes
      end
    end
  end
end

[pencilcheck]

What I see is that in nested_field_association method in file form_builder.rb
field.associated_model_config returns an array instead, so getting this error

undefined method `abstract_model' for #<Array:0x007fadec5b7da8>

This only happens if I add inverse_of to the children model. Using @chrisbloom7 example, it is the Note model.

Using 0.6.5

[pencilcheck]

Actually, if you use my fork

gem 'rails_admin', github: 'pencilcheck/rails_admin', branch: 'master'

In the time being, you can add inverse_of to both sides and it will work like a charm :)
Let's hope this is merged asap.

[victorbv]

@pencilcheck, thank you for your fork, it's working fine for me. I strongly recommend the merge.

[voyera]

This fork is working fine for me as well. I'm not sure what the merge would entail but it would be worth investigating.

[vedant1811]

Hello, what is the status of this. Will this patch be merged, or we already have a better implementation?