Edges are documents with special
_to attributes to reference other documents by their ID to form a graph
Edges are used in graphs to link vertices together.
They are documents with two additional system attributes that you set, a
_from and a
_to attribute. They need to be stored in edge collections.
Together with vertex documents stored in document collections (also called vertex collections in this context), edges form graphs.
- An edge collection stores the information that a company’s reception is a
sub-unit to the services unit and the services unit is sub-unit to the
CEO. You would express this relationship with the
- A vertex collection stores all the properties about the reception, for example, that 20 people are working there, the room number, and so on.
_fromattribute of an edge is the document ID of the linked vertex (incoming relation).
_toattribute of an edge is the document ID of the linked vertex (outgoing relation).
Edges are normal documents but additionally have a
_from and a
that you need to set.
You can update the
_to attributes like any other document attribute
using the Documents API.
For methods you can call on edge collections, see the edge document methods of the collection object.