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-rw-r--r--activerecord/test/models/edge.rb5
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diff --git a/activerecord/test/models/edge.rb b/activerecord/test/models/edge.rb
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+# This class models an edge in a directed graph.
+class Edge < ActiveRecord::Base
+ belongs_to :source, :class_name => 'Vertex', :foreign_key => 'source_id'
+ belongs_to :sink, :class_name => 'Vertex', :foreign_key => 'sink_id'
+end