CODEWITHSUNDEEP
arangodb
LongkerDandy
LongkerDandy

Reputation: 135

How to create or replace a edge

In ArangoDB, I'have a graph with two Vertexs(Users and Devices) one Edge(User Device Relation). With one User and one Device there can only be one Relation, so the Edge's key is fixed like "{User Key}_{Device Key}". My questions are:

Upvotes: 0

Views: 407

Answers (1)

florian
florian

Reputation: 263

Is there a single command can create a new edge if not exist and replace one if already exist?

No unfortunately not, you would first have to look up the edge and update/create if needed.

With Java driver, what is the equal method of "collection.exists(document)"?

Which Java driver are you using ? If you are using this one (the one we recommend) you could use

checkDocument

but you have to surround it with a try catch and check if you receive a 404 error code :

try {
      driver.checkDocument(collectionName, documentKey);
      fail();
    } catch (ArangoException e) {
      assertThat(e.getCode(), is(0));
      assertThat(e.getErrorNumber(), is(404));
    }

Upvotes: 1

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