Check if property value exists

Question

i'm looking for a way to check if a value does already exists. My current way is:

store.createQuery(MyClass.class).field(property).equal(value).countAll() > 0;

Is this the most efficient way or is there a better way to do this? I don't need count all, the first match is enough.

Answer 1

You seem to be really looking for the "createIfMissing" or general MongoDB "upsert" behavior. What this does is id the query condition does not find a document to update then a new document is created:

ops = store.createUpdateOperations(MyClass.class).set("name", "This Value");
store.updateFirst(MyClass.class).field(property).equal(value), ops, true)

Also look at the $set operator and .update() method from the core MongoDB documentation.