Hello everyone. I'm having some issue querying the root entity for its
child entities. Here is a sample of my code
@Test
public void inviteUserToEvent() throws EntityNotFoundException {
Person host = new Person("John");
Person guest = new Person("Adam");
Entity firstEvent = new Entity("Event", host.getName());
firstEvent.setProperty("description", "Party tonight");
firstEvent.setProperty("location", "New York");
Entity firstInvitation = new Entity("Event", guest.getName(),
firstEvent.getKey());
firstInvitation.setProperty("username", guest.getName());
firstInvitation.setProperty("attending", true);
Entity secondEvent = new Entity("Event", host.getName());
secondEvent.setProperty("description", "Going for a walk");
secondEvent.setProperty("location", "California");
Entity secondInvitation = new Entity("Event", guest.getName(),
secondEvent.getKey());
secondInvitation.setProperty("username", guest.getName());
secondInvitation.setProperty("attending", false);
datastore.put(firstEvent);
datastore.put(secondEvent);
datastore.put(firstInvitation);
datastore.put(secondInvitation);
Query query = new Query("Event");
query.setFilter(new Query.FilterPredicate("username",
Query.FilterOperator.EQUAL, guest.getName()));
List<Entity> entityList =
datastore.prepare(query).asList(FetchOptions.Builder.withDefaults());
for (Entity entity : entityList) {
System.out.println("Key: " + entity.getKey().toString());
System.out.println("Guest: " + entity.getProperty("username"));
System.out.println("Attending: " + entity.getProperty("attending"));
System.out.println("Location: " +
datastore.get(entity.getParent()).getProperty("location"));
System.out.println("Description: " +
datastore.get(entity.getParent()).getProperty("description"));
}
}
class Person {
private String username;
public Person(String username) {
this.username = username;
}
public String getName() {
return username;
}
}
And I can only get on of the invitations depending on whether or not I save
the first or the second one.
I can't get both of them. I think that the problem is in the keys of the
child entities.
I tried to make the key of the child entities like this without specifying
the guest's username.
Entity firstInvitation = new Entity("Event", firstEvent.getKey());
But the result was the same.
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