Filter by labels

Most patterns are composed with labels such as (m:Movie) to make filtering by labels easy. You can also use Label expressions to perform complex filtering by labels.

`.hasLabel`

It is possible to check for label existence in WHERE filters. Use the methods .hasLabel and .hasLabels for Node variables. For example, to match nodes with either the Movie or Film labels:

const movieNode = new Cypher.Node();

const matchQuery = new Cypher.Match(new Cypher.Pattern(movieNode))
    .where(Cypher.or(movieNode.hasLabel("Movie"), movieNode.hasLabel("Film")))
    .return(movieNode);

MATCH (this0)
WHERE (this0:Movie OR this0:Film)
RETURN this0

The method .hasLabels allows you to provide multiple labels that the node must have:

const movieNode = new Cypher.Node();

const matchQuery = new Cypher.Match(new Cypher.Pattern(movieNode))
    .where(movieNode.hasLabels("Movie", "Film"))
    .return(movieNode);

MATCH (this0)
WHERE this0:Movie:Film
RETURN this0

`.hasType`

Like labels, relationship types can be filtered in WHERE statements with the method .hasType:

const personNode = new Cypher.Node();
const actedIn = new Cypher.Relationship();

const actedInPattern = new Cypher.Pattern({ labels: ["Movie"] })
    .related(actedIn)
    .to(personNode, { labels: ["Person"] });

const matchQuery = new Cypher.Match(actedInPattern)
    .where(Cypher.or(actedIn.hasType("ACTED_IN"), actedIn.hasType("DIRECTED")))
    .return(personNode);

MATCH (:Movie)-[this0]->(this1:Person)
WHERE (this0:ACTED_IN OR this0:DIRECTED)
RETURN this