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# This class models a vertex in a directed graph.
class Vertex < ActiveRecord::Base
has_many :sink_edges, :class_name => "Edge", :foreign_key => "source_id"
has_many :sinks, :through => :sink_edges
has_and_belongs_to_many :sources,
:class_name => "Vertex", :join_table => "edges",
:foreign_key => "sink_id", :association_foreign_key => "source_id"
end
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