using_edges.diviner
1d9d2d066e22legacy-2019

using_edges.diviner
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			@title Using Edges
			@group developer

			Guide to the Edges infrastructure.

			= Overview =

			Edges are a generic way of storing a relationship between two objects (like a
			Task and its attached files). If you are familiar with the Facebook associations
			framework, Phabricator Edges are substantially similar.

			An edge is defined by a source PHID (the edge origin), a destination PHID
			(the edge destination) and an edge type (which describes the relationship,
			like "is subscribed to" or "has attached file").

			Every edge is directional, and stored alongside the source object. Some edges
			are configured to automatically write an inverse edge, effectively building
			a bidirectional relationship. The strength of storing relationships like this
			is that they work when databases are partitioned or sharded.

			= Reading Edges =

			You can load edges with @{class:PhabricatorEdgeQuery}.

			= Writing Edges =

			You can edit edges with @{class:PhabricatorEdgeEditor}.

			= Edges and Lisk =

			@{class:PhabricatorLiskDAO} includes some builtin support for edges.