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Force relationships from a node label X to a node label Y to have specific properties

create relationships between nodes in parallelHow to create and retrieve a node by its label in Neo4j 2.0.0M5Adding relationship to existing nodes with CypherClone nodes and relationships with Cypherneo4j - labels vs properties vs relationship + nodeHow to use relationship index in CypherFind Nodes with the same properties in Neo4JCreate relationships using Node csv and Relationship csvHow to validate an update cypher query against a schema?Neo4j: Query for a path between two nodes in a specific order of relationships and knowing only label of the last node

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I'm aware that using the "relationship property existence constraint" available in Neo4j Enterprise I can force relationships of a given label to have some properties, for example:

(Relationships of label "LIKED" always have a "day" property)

CREATE CONSTRAINT ON ()-[like:LIKED]-() ASSERT exists(like.day)

But is it possible to force relationships from a node label X to a node label Y to have specific properties? An example of what I would like to do would be:

(Relationships of label "BOUGHT" from/to nodes label "Person" to/from nodes label "Book" always have a "day" property)

CREATE CONSTRAINT ON (p:Person)-[bo:BOUGHT]-(b:Book) ASSERT exists(b.day)

But that isn't considered a valid Cypher command. Is there a way to achieve this effect at a schema level or would I need to implement it in the application layer? Thank you.

database graph neo4j cypher schema

share|improve this question

edited Mar 28 at 4:11

Telmo Trooper

asked Mar 28 at 3:43

Telmo TrooperTelmo Trooper

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add a comment | 

0

I'm aware that using the "relationship property existence constraint" available in Neo4j Enterprise I can force relationships of a given label to have some properties, for example:

(Relationships of label "LIKED" always have a "day" property)

CREATE CONSTRAINT ON ()-[like:LIKED]-() ASSERT exists(like.day)

But is it possible to force relationships from a node label X to a node label Y to have specific properties? An example of what I would like to do would be:

(Relationships of label "BOUGHT" from/to nodes label "Person" to/from nodes label "Book" always have a "day" property)

CREATE CONSTRAINT ON (p:Person)-[bo:BOUGHT]-(b:Book) ASSERT exists(b.day)

But that isn't considered a valid Cypher command. Is there a way to achieve this effect at a schema level or would I need to implement it in the application layer? Thank you.

database graph neo4j cypher schema

share|improve this question

edited Mar 28 at 4:11

Telmo Trooper

asked Mar 28 at 3:43

Telmo TrooperTelmo Trooper

1,04199 silver badges1919 bronze badges

add a comment | 

I'm aware that using the "relationship property existence constraint" available in Neo4j Enterprise I can force relationships of a given label to have some properties, for example:

(Relationships of label "LIKED" always have a "day" property)

CREATE CONSTRAINT ON ()-[like:LIKED]-() ASSERT exists(like.day)

But is it possible to force relationships from a node label X to a node label Y to have specific properties? An example of what I would like to do would be:

(Relationships of label "BOUGHT" from/to nodes label "Person" to/from nodes label "Book" always have a "day" property)

CREATE CONSTRAINT ON (p:Person)-[bo:BOUGHT]-(b:Book) ASSERT exists(b.day)

But that isn't considered a valid Cypher command. Is there a way to achieve this effect at a schema level or would I need to implement it in the application layer? Thank you.

database graph neo4j cypher schema

share|improve this question

edited Mar 28 at 4:11

Telmo Trooper

asked Mar 28 at 3:43

Telmo TrooperTelmo Trooper

1,04199 silver badges1919 bronze badges

CREATE CONSTRAINT ON ()-[like:LIKED]-() ASSERT exists(like.day)

CREATE CONSTRAINT ON (p:Person)-[bo:BOUGHT]-(b:Book) ASSERT exists(b.day)

share|improve this question

edited Mar 28 at 4:11

Telmo Trooper

asked Mar 28 at 3:43

Telmo TrooperTelmo Trooper

1,04199 silver badges1919 bronze badges

share|improve this question

edited Mar 28 at 4:11

Telmo Trooper

asked Mar 28 at 3:43

Telmo TrooperTelmo Trooper

1,04199 silver badges1919 bronze badges

asked Mar 28 at 3:43

Telmo TrooperTelmo Trooper

1,04199 silver badges1919 bronze badges

asked Mar 28 at 3:43

Telmo TrooperTelmo Trooper

1,04199 silver badges1919 bronze badges

1 Answer
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Unfortunately, It's not possible to achieve this effect at a schema level at the moment.

You need to figure it out, how to implement this in the application layer.

If this LIKED relationship is different from other LIKED
relationship( i.e. LIKED relationship between other node labels pair)
then you can name it anything else and create "relationship property
existence constraint" on it.

share|improve this answer

edited Mar 28 at 4:50

answered Mar 28 at 4:44

RajRaj

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Unfortunately, It's not possible to achieve this effect at a schema level at the moment.

You need to figure it out, how to implement this in the application layer.

If this LIKED relationship is different from other LIKED
relationship( i.e. LIKED relationship between other node labels pair)
then you can name it anything else and create "relationship property
existence constraint" on it.

share|improve this answer

edited Mar 28 at 4:50

answered Mar 28 at 4:44

RajRaj

2,70611 gold badge66 silver badges1919 bronze badges

add a comment | 

0

Unfortunately, It's not possible to achieve this effect at a schema level at the moment.

You need to figure it out, how to implement this in the application layer.

If this LIKED relationship is different from other LIKED
relationship( i.e. LIKED relationship between other node labels pair)
then you can name it anything else and create "relationship property
existence constraint" on it.

share|improve this answer

edited Mar 28 at 4:50

answered Mar 28 at 4:44

RajRaj

2,70611 gold badge66 silver badges1919 bronze badges

add a comment | 

Unfortunately, It's not possible to achieve this effect at a schema level at the moment.

You need to figure it out, how to implement this in the application layer.

If this LIKED relationship is different from other LIKED
relationship( i.e. LIKED relationship between other node labels pair)
then you can name it anything else and create "relationship property
existence constraint" on it.

share|improve this answer

edited Mar 28 at 4:50

answered Mar 28 at 4:44

RajRaj

2,70611 gold badge66 silver badges1919 bronze badges

share|improve this answer

edited Mar 28 at 4:50

answered Mar 28 at 4:44

RajRaj

2,70611 gold badge66 silver badges1919 bronze badges

answered Mar 28 at 4:44

RajRaj

2,70611 gold badge66 silver badges1919 bronze badges

answered Mar 28 at 4:44

RajRaj

2,70611 gold badge66 silver badges1919 bronze badges