7aaf4867d2
git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4776 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
10 lines
385 B
Ruby
10 lines
385 B
Ruby
# This class models a vertex in a directed graph.
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class Vertex < ActiveRecord::Base
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has_many :sink_edges, :class_name => 'Edge', :foreign_key => 'source_id'
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has_many :sinks, :through => :sink_edges, :source => :sink
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has_and_belongs_to_many :sources,
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:class_name => 'Vertex', :join_table => 'edges',
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:foreign_key => 'sink_id', :association_foreign_key => 'source_id'
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end
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