Google App Engine数据查询返回0个结果

Question

I'm attempting login using google app engine with objectify but since the Google User object doesn't have enough information I created a local Entity that looks like so :

@Cache
@Entity
public abstract class UserData extends RoleUser implements UserDetails {

    protected String firstName;
    protected String middleName;
    protected String lastName;


    protected boolean enabled;
    protected String phoneNumber;

    @Index
    protected String email;

    @Index
    protected String userName;

and I have a subclass for a GoogleUser like so :

@Subclass
public class GoogleUser extends UserData {

    private String googleUserId;
    private String authDomain;

Finally the query that I run to see if my custom entity was created for a specific email is like so :

public boolean isNewUser(String email){
    int count = ofy().load().type(GoogleUser.class).filter("userName =", email).count();
    logger.debug("Total accounts for email: |" + email + "| \t Count: " + count);
    return count == 0;
} 

The problem I'm having is that the query returns 0 results even though I see the entity when I look at datastore through admin on my local appengine server. I'm at the end of my rope here so I would appreciate any help.

Answer 1

objectify does not index subclasses by default. You have to explicitly enable this for each subclass, like so:

@Subclass(index=true)
public class GoogleUser extends UserData {

    private String googleUserId;
    private String authDomain;

Note that if you have changed the polymorphic hierarchy of your class you will need to re-save your entity for indexing to work.

Little tip: Having no operator in the filter means == Your query can be written like this

int count = ofy().load().type(GoogleUser.class).filter("userName", email).list();

Answer 2

I'm wondering if

.filter("userName =", email)

should have been

.filter("email =", email)