Objectify with Cloud Endpoints

Question

I am using appengine cloud endpoints and objectify. I have previously deployed these endpoints before and now I am updating them and it is not working with Objectify. I have m

Answer 1

At first, I did not understand the answer given by Flori, and how useful it really is. Because others may benefit, I will give a short explanation.

As explained earlier, you can use @ApiTransformer to define a transformer for your class. This would transform an unserializable field, like those of type Key into something else, like a Long.

It turns out that when a class is processed by GCE, methods called get{fieldName} and set{FieldName} are automatically used to transform the field {fieldName}. I have not been able to find this anywhere in Google's documentation.

Here is how I use it for the Key{Machine} property in my Exercise class:

public class Exercise {
  @ApiResourceProperty(ignored = AnnotationBoolean.TRUE)
  public Key machine;
  // ... more properties

  public Long getMachineId() {
    return this.machine.getId();
  }

  public void setMachineId(Long machineId) {
    this.machine = new Key(Machine.class, machineId);
  }

  // ...
}