Recreating this custom query using has_many?

You can do this with the :through option has_many :pages, :through => :component_instances, :source => :parent, :source_type => 'Page.

You can do this with the :through option. Has_many :pages, :through => :component_instances, :source => :parent, :source_type => 'Page.

Thanks for the lead Michael, in the end this worked: has_one :page_set, :foreign_key => :parent_id belongs_to :instance, :polymorphic => true, :dependent => :destroy has_many :pages, :through => :page_set, :source => :instance, :source_type => 'Page', :extend => LearningCaveFilterExtension but it's a little bit sketchy as the :page_set method actually returns something completely wrong. Ideally it should return self but I needed to put :parent_id as the foreign key so that the SQL generated from the has_many pages declaration was correct (using :id would be the correct way but then that screws up the :pages method. :) My mind hasn't quite gotten around what's going on here, but at least it works and scoping works too :) Thanks for the help, and if you have any explanations as to why that works, please let me know :).

Lol, sleeping on it gave me the answer: class PageSet :parent_id, :class_name => 'PageSet' belongs_to :instance, :polymorphic => true, :dependent => :destroy has_many :pages, :through => :children, :source => :instance, :source_type => 'Page' end The entities with the link through parent_id are rightly children, I was just referring to them in the wrong way, but AR didn't raise any errors :).

Thanks for the lead Michael, in the end this worked.

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