neo4jphp: creation of unique nodes

[samar uppal]

Am using the neo4jphp library in order to create my graph. But the
below code is duplicating my codes. I don't see the REST API providing
any of enforcing uniqueness of a node during node creation.

$batch = new Everyman\Neo4j\Batch($client);
while ($row = mysql_fetch_array($user_rels, MYSQL_NUM)) {
$usernode = $client->makeNode();
$usernode->setProperty('name', $row[1])
->setProperty('guid', $row[0])
->setProperty('type', 'user')
->save();
}
$batch-commit()



Thanks,
Samar

[Josh Adell]

Samar,

The REST API does not do any uniqueness checking when you ask it to create a node. If you want to create a unique node, you need to add it to an index and specify that the node should only be created in the index if it does not already exist.

neo4jphp does not currently support this, but there is active discussion about how best to go about it. It should be in the library soon. If you have immediate need for it, you can always query for a node with the unique properties and see if it exists before creating it.

Also, in your code, just creating a new Batch object doesn't do anything. You should use $client->startBatch() and $client->commitBatch()

-- Josh

[Tatham Oddie]

Alternatively, if neo4jphp supports Cypher, you could use the CREATE UNIQUE clause there.

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[Josh Adell]

Good point, Tatham, thanks.

Yes, neo4jphp does support Cypher, but not in Batch operations. However, you can use Cypher to create multiple nodes at once, and they will all be created in a single transaction.

-- Josh

[Michael Hunger]

There is a create unique node REST api call at least

http://docs.neo4j.org/chunked/milestone/rest-api-unique-indexes.html

Sent from mobile device

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[unixx]

Thanks for the tips folks! For now, am checking on the client side for duplicates. Will look into implementing the unique indexes rest api call for neo4jphp.

We have a great forum going on here. 

;)

[Michael Hunger]

Create unique doesn't create unique nodes

Sent from mobile device

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[Krishna Shetty]

Can create uniqueness using lables? 

Like:

CREATE CONSTRAINT ON (n:user) ASSERT n.guid IS UNIQUE;

Thanks,Krishna

[Peter Neubauer]

Yes,

see http://docs.neo4j.org/chunked/snapshot/query-constraints.html#constraints-create-uniqueness-constraint

/peter

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