Dynamic relation creation

[deluca687]

How can we add properties to existing relationships dynamically? We are able to create them within Entity classes, but how can we create them on the fly?

This was from a previous answer with the same question

There is no direct way to do it through the API at this time. While there is some work in progress, it is quite far from completed.

You can register a callback on relation creation.

$em->registerEvent(HireVoice\Neo4j\EntityManager::RELATION_CREATE, function ($type, $relationName, $from, $to, $relation) {
    // $relation is the Everyman\Neo4j\Relationship
    if ($relationName === 'GOES_TO_MARKET') {
        $relation->setProperty('foobar', 'baz')->save();
    }
});

How exactly does this return a relation to modify? How do we use this?

[lphuberdeau]

It does not return a relation, it is provided as an argument in the callback.

This is related to a missing feature tracked as #38.

[deluca687]

Ah I missed that, this bundle is great, we just need a method of adding properties to relationships dynamically which your example callback seems to do, an example use case would be great as I along with others are unsure how to implement it.

Thanks for the reply

[lphuberdeau]

It's quite hard to do at this time. From the callback, you would need to figure out what the property needs to be given the from and to node.

It's quite a large chunk to add to the library to do it natively and I don't quite have enough time on my hands at this time.