--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/thingfish/metastore/pggraph/edge.rb	Thu Nov 05 10:34:15 2015 -0800
@@ -0,0 +1,52 @@
+# -*- ruby -*-
+#encoding: utf-8
+
+require 'sequel/model'
+
+require 'thingfish/mixins'
+require 'thingfish/metastore/pggraph' unless defined?( Thingfish::Metastore::PgGraph )
+
+
+### A row representing a relationship between two node objects.
+###
+class Thingfish::Metastore::PgGraph::Edge < Sequel::Model( :edges )
+
+	# Related resource associations
+	many_to_one :node, :key => :id_p
+
+	# Dataset methods
+	#
+	dataset_module do
+		#########
+		protected
+		#########
+
+		### Returns a Sequel expression suitable for use as the key of a query against
+		### the specified property field.
+		###
+		def prop_expr( field )
+			return Sequel.pg_jsonb( :prop ).get_text( field.to_s )
+		end
+	end
+
+
+	### Do some initial attribute setup for new objects.
+	###
+	def initialize( * )
+		super
+		self[ :prop ] ||= Sequel.pg_jsonb({})
+	end
+
+
+	#########
+	protected
+	#########
+
+	### Proxy method -- fetch a value from the edge property hash if it exists.
+	###
+	def method_missing( sym, *args, &block )
+		return self.prop[ sym.to_s ] || super
+	end
+
+end # Thingfish::Metastore::PgGraph::Edge
+