Rails - Feb 2011 - has_many :through question

Hi,
I am having some difficulty getting has_many relationship setup
correctly.

def acts_as_markable
	has_many :marks, :as => :markable
        belongs_to :author, :class_name => "WebsiteUser"
end

class Video < ActiveRecord::Base
	set_table_name "markables"
	acts_as_markable
end

class Mark < ActiveRecord::Base
  acts_as_markable
  belongs_to :markable, :polymorphic => true
end

class WebsiteUser < ActiveRecord::Base
  has_many :marks
  has_many :videos_marked, :through => :marks, :source
=> :markable, :source_type => "Video", :class_name =>
"Video", :foreign_key => :author_id
end

running WebsiteUser.first.videos_marked I get this:
SQLite3::SQLException: no such column: marks.website_user_id: SELECT
"markables".* FROM "markables" INNER JOIN "marks"
ON "markables".id "marks".markable_id AND
"marks".markable_type = ''Video'' WHERE
(("marks".website_user_id = 1))

Correct query would be:
SELECT "markables".* FROM "markables" INNER JOIN
"marks" ON
"markables".id = "marks".markable_id AND
"marks".markable_type ''Video'' WHERE
(("marks".author_id = 1))

any ideas? thank you.

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found the problem :)

had to change WebsiteUser''s has_many :marks to include :foreign_key
=>
author_id

class WebsiteUser < ActiveRecord::Base
  has_many :marks, :foreign_key => :author_id
  has_many :videos_marked, :through => :marks, :source
=> :markable, :source_type => "Video", :class_name =>
"Video"
end

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