apoc.convert.toRelationship
Function

Details
Syntax	`apoc.convert.toRelationship(rel)`
Description	Converts the given value into a `RELATIONSHIP`.
Arguments	Name	Type	Description
	`rel`	`ANY`	The value to convert into a relationship.
Returns	`RELATIONSHIP`

Example

Given this dataset:

CREATE (:Person {name: 'Alice'})-[:KNOWS {since: 2020}]->(:Person {name: 'Bob'})

The following query uses apoc.convert.toRelationship to cast a value extracted from a generic list back to a RELATIONSHIP:

MATCH ()-[r:KNOWS]->()
WITH collect(r) AS rels
RETURN apoc.convert.toRelationship(rels[0]) AS rel

Results
rel
[:KNOWS {since: 2020}]

The function returns null when passed null or a value that is not a RELATIONSHIP:

RETURN apoc.convert.toRelationship(null) AS nullInput,
     apoc.convert.toRelationship('not a rel') AS wrongType

Results
nullInput	wrongType
null	null