apoc.refactor.extractNode

Procedure APOC Core

apoc.refactor.extractNode([rel1,rel2,…], [labels],'OUT','IN') extract node from relationships

Signature

apoc.refactor.extractNode(relationships :: ANY?, labels :: LIST? OF STRING?, outType :: STRING?, inType :: STRING?) :: (input :: INTEGER?, output :: NODE?, error :: STRING?)

Input parameters

Name	Type	Default
relationships	ANY?	null
labels	LIST? OF STRING?	null
outType	STRING?	null
inType	STRING?	null

Name

Type

Default

relationships

ANY?

null

labels

LIST? OF STRING?

null

outType

STRING?

null

inType

STRING?

null

Output parameters

Name	Type
input	INTEGER?
output	NODE?
error	STRING?

Name

Type

input

INTEGER?

output

NODE?

error

STRING?

Usage Examples

The examples in this section are based on the following sample graph:

CREATE (origin:Airport {code: "LHR"})
CREATE (destination:Airport {code: "AMS"})
CREATE (origin)-[:FLIGHT {number: "BA001"}]->(destination);

The following creates a Flight node with an IN relationship from LHR and an OUT relationship to AMS:

MATCH (:Airport)-[rel:FLIGHT]->(:Airport)
WITH collect(rel) AS rels
CALL apoc.refactor.extractNode(rels,['Flight'],'OUT','IN')
YIELD input, output
RETURN input, output;

Table 1. Results
input	output
0	(:Flight {number: "BA001"})

We can list all the Flight nodes by running the following query:

MATCH path = (origin)-[:IN]->(:Flight)-[:OUT]->(destination)
RETURN path;

Table 2. Results
path
(:Airport {code: "LHR"})-[:IN]→(:Flight {number: "BA001"})-[:OUT]→(:Airport {code: "AMS"})