1 # -*- ruby -*-

     2 #encoding: utf-8

     3 

     4 require 'sequel/model'

     5 

     6 require 'thingfish/mixins'

     7 require 'thingfish/metastore/pggraph' unless defined?( Thingfish::Metastore::PgGraph )

     8 

     9 

    10 ### A row representing a relationship between two node objects.

    11 ###

    12 class Thingfish::Metastore::PgGraph::Edge < Sequel::Model( :edges )

    13 

    14 	# Related resource associations

    15 	many_to_one :node, :key => :id_p

    16 

    17 	# Dataset methods

    18 	#

    19 	dataset_module do

    20 		#########

    21 		protected

    22 		#########

    23 

    24 		### Returns a Sequel expression suitable for use as the key of a query against

    25 		### the specified property field.

    26 		###

    27 		def prop_expr( field )

    28 			return Sequel.pg_jsonb( :prop ).get_text( field.to_s )

    29 		end

    30 	end

    31 

    32 

    33 	### Do some initial attribute setup for new objects.

    34 	###

    35 	def initialize( * )

    36 		super

    37 		self[ :prop ] ||= Sequel.pg_jsonb({})

    38 	end

    39 

    40 

    41 	#########

    42 	protected

    43 	#########

    44 

    45 	### Proxy method -- fetch a value from the edge property hash if it exists.

    46 	###

    47 	def method_missing( sym, *args, &block )

    48 		return self.prop[ sym.to_s ] || super

    49 	end

    50 

    51 end # Thingfish::Metastore::PgGraph::Edge

    52