CODEWITHSUNDEEP
google-app-engineobjectify
quarks
quarks

Reputation: 35282

Getting an Entity key

Based on the Q&A from here: Get an Objectify Entity's Key

For a persisted object, getting the entity key with: 

@Transient
Key<Categoria> getKey() {
   return new Key<Categoria>(Categoria.class, id);
}

Doensn't return the same key with:

Objectify ofy = ObjectifyService.begin();
Key<Categoria> key = ofy.getFactory().getKey(someobject);

Or should it?

My model looks like this:

@Entity
class Categoria{
  @Parent
  private Key<Someclass> parentKey;

  @Transient
  Key<Categoria> getKey() {
   return new Key<Categoria>(Categoria.class, id);
 }
 // Code omitted
}

Upvotes: 0

Views: 180

Answers (2)

user1258245
user1258245

Reputation: 3639

It should. I always get Objectify Entities via keys created from the a long id. You can also use the returned key to get the long id from the key if needed.

EDIT: You can't get the key the way you are trying.

You have to do.

Key<Car> rootKey = new Key<Car>(Car.class, 959);
Key<Car> keyWithParent = new Key<Car>(parent, Car.class, 959);

from the objectify wiki

So for this line: Key key = ofy.getFactory().getKey(someobject);

key will consist of both the parent key PLUS the Categoria key

that means you have to include the parent key when you do the lookup in your function

Key<Categoria> getKey() {
 return new Key<Categoria>(parentKey, Categoria.class, id);
}

Upvotes: 0

stickfigure
stickfigure

Reputation: 13556

It will only produce a different key if Categoria has a @Parent field. In that case, you need to pass the parent key into the Key constructor along with the class and id.

Upvotes: 2

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