Defining ArangoDB Relationships

The following properties are applicable to an ArangoDB Relationship object.

Tab	Property	Description	Additional Information
	Parent	Specifies the parent collection or view of the relationship
	Child	Specifies the child collection or view of the relationship
	Physical Only	Specifies whether the relationship is generated in physical model only
	Generate	Specifies whether the relationship is generated
General	Edge Definitions	Specifies the list of relation definition objects
	Type	Specifies the relationship type	Identifying: Indicates that the child entity is dependent on the parent entity for its identity and cannot exist without it Non-Identifying: Indicates that one instance of the parent entity is related to multiple instances of the child entity
	Null Option	Specifies the null option in the Non-Identifying relationship fields	Null: Specifies that the foreign key within the child entity will accept nulls. This means that the child entity can exist without the existence of the parent and the relationship is optional. Not Null: Specifies that the foreign key within the child entity will not accept nulls. This means that the child entity is dependent upon the parent entity for its existence and the relationship is mandatory.
	Physical Name	Specifies the physical name of the relationship
	Database	Specifies the database of the relationship
	Cardinality	Specifies the cardinality of the relationship	Zero, One or More: Indicates that each parent in the relationship is connected to zero, one, or more instances of the child entity One or More (P): Indicates that each parent in the relationship is connected to one or more instances of the child entity Zero or One (Z): Indicates that each parent in the relationship is connected to zero or one instance of the child entity
	Cardinality Value	Specifies the cardinality value of the relationship

Relationship types, Identifying and Non-Identifying are only for representational purpose and not supported in ArangoDB database. Relationships in ArangoDB database is defined between two document collections via an edge collection.