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latortuga/gist:1871299

Created February 20, 2012 20:43
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gistfile1.rb
has_many :child_connections, :class_name => 'Connection', :foreign_key => 'from_id'
has_many :parent_connections, :class_name => 'Connection', :foreign_key => 'to_id', :dependent => :destroy
has_many :children, :through => :child_connections, :source => :to
has_many :parents, :through => :parent_connections, :source => :from
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