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diff --git a/vendor/rails/activerecord/test/models/edge.rb b/vendor/rails/activerecord/test/models/edge.rb
new file mode 100644
index 0000000..55e0c31
--- /dev/null
+++ b/vendor/rails/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