ActiveRecord::InverseOfAssociationNotFoundError with self join

[vala]

Hi,

I've been stuck with a ActiveRecord::InverseOfAssociationNotFoundError while trying to make a self join in some model.

The model relevant code :

class Category < ActiveRecord::Base
  belongs_to :parent_category, :class_name => 'Category', :foreign_key => 'parent_id', :inverse_of => 'children_categories'
  has_many :children_categories, :class_name => 'Category', :foreign_key => 'parent_id', :inverse_of => 'parent_category'
end

Rails recognize my association and everything is working fine.
If I avoid :inverse_of param I can get to make RA work but the parent_category field is a text_field instead of the desired dropdown and children_categories is not shown.
The field children_categories appears if I force it from the rails_admin.rb initializer but shows me a dropdown select instead of multiple select.

EDIT : Like my previous issue, I'm on Rails 3.2 ... if it matters

I don't know if it's a known issue or if I'm making something wrong, but I'll try to figure it out.

[vala]

Well, avoiding the :inverse_of finally worked. I admit I can't tell why it didn't worked before since I don't remember doing any action between the time it failed and now that it works apart from modifying the way I declare my relations.

So the working self-join relation :

class Category < ActiveRecord::Base
  belongs_to :parent_category, :class_name => 'Category', :foreign_key => 'parent_id'
  has_many :children_categories, :class_name => 'Category', :foreign_key => 'parent_id'
end

I think I'm misunderstanding something, but well, if it can be helpful.

Have a good day

[narokir]

There are a few limitations to inverse_of support:

They do not work with :through associations.
They do not work with :polymorphic associations.
They do not work with :as associations.
For belongs_to associations, has_many inverse associations are ignored.