OrientDB Query by edge property

问题:

I have two vertex classes: Location and User and I have two edges also: Friend and GoingTo. A User can be 'Friend' with another User and a User can also 'GoingTo' a Location. The edge GoingTo has a datetime property called going_date with the date the user is going to the Location.

I want to return every ‘Location’ that has a in(“GoingTo”) edge from an ‘User’ that is a (“Friend”) of a specific starting ‘User’ (#12:11 as example).

What I have here is all locations but without the date property of goingTo...

SELECT expand(both('Friend').out('goingTo')) FROM #12:11

How can I query by this edge property?

回答1:

You can filter on edge's property:

SELECT expand(both('Friend').outE('goingTo')[going_date='2015-01-01'].inV()) FROM #12:11

回答2:

Little late but since this was a high result for my google search, thought I'd link the answer I found on another question.

My use case, and I believe a wide category of use cases leaning on recursion, has to store data in edge properties.

For OP, it should be

SELECT expand(both('Friend').out('goingTo')) FROM #12:11 
WHERE out_goingTo[0].going_date = '2015-01-01'

This seems like a case where you'd have 1-many "going to" edges, so it could be

WHERE out_goingTo[0-100] for a range or

WHERE out_goingTo[0,5,10] for a set.

HTH!