Re: Error loading Entity containing Collection of @Embed objects that contain a Collection

[Andy DeWolfe]

Sorry for the double post - first time using Google Groups

On Sunday, October 14, 2012 7:45:52 PM UTC-4, Andy DeWolfe wrote:

Hello all.   Newbie ( to Objectify4 ) here.  Objectify4 rocks!

Trying to do a 1-to-many using Colleciton of @Embed's.  Got the general idea from another post in this group.

However, my @Embed class contains it's own collection.  ( using Objectify4.0a4 )

  @Entity

  class Group {

      @Id

      Long id;

      @Embed

      static class GroupPerson {

        @Index

        @Load

        public Ref<Person> person;

        

        public Set<String> roles;         // <---- collection inside @Embed object

      }

      static class GroupPersonMapper implements Mapper< Key<Person> , GroupPerson > {

        @Override

        public Key<Person> getKey(GroupPerson value) {

          return value.person.getKey();

        }

      }

      

      @Mapify(GroupPersonMapper.class)

      @Load

      Map< Key<Person> , GroupPerson > groupMembers;      // <-- collection of @Embed objects

  }

    

    

I can persist this to the dataStore fine, and it even looks "right" in the GAE console.

   groupMembers.roles = [role1,role2] (unindexed)

When i tried to load a Group entity (from a Query), I get the following exception

com.googlecode.objectify.LoadException: Error loading Group(2155): groupMembers.roles: Expected list structure but found {role1,role2}

at com.googlecode.objectify.impl.Transmog.load(Transmog.java:76)

at com.googlecode.objectify.impl.ConcreteEntityMetadata.load(ConcreteEntityMetadata.java:121)

at com.googlecode.objectify.impl.cmd.ObjectifyImpl.load(ObjectifyImpl.java:386)

at com.googlecode.objectify.impl.engine.LoadEngine$Round$2.now(LoadEngine.java:102)

at com.googlecode.objectify.impl.ref.StdRef.get(StdRef.java:57)

at com.googlecode.objectify.impl.cmd.QueryImpl$3.translate(QueryImpl.java:381)

at com.googlecode.objectify.impl.cmd.QueryImpl$3.translate(QueryImpl.java:1)

at com.googlecode.objectify.util.TranslatingQueryResultIterable$1.translate(TranslatingQueryResultIterable.java:31)

at com.googlecode.objectify.util.TranslatingIterator.next(TranslatingIterator.java:35)

Changing Collection from Set<String> to List<String> had no effect.  Should this work?  Am I doing something wrong?

Thanks in advance,

Andy

[Alex]

Unfortunately Objectify doesn't like multi-levelled list embedding (assuming it's the error I think it is).
Unless you have the need to query/search it, using @Serialized instead of @Embed will "fix" it.

Alex.

[Alex]

Oh lol, Jeff answered your other post w.r.t. @Mapify
In any case - I usually just use @Serialized when I get an error like that - usually fixes it.

Alex.

[Andy DeWolfe]

Hi Alex,

In my example, I do want to query for groupPerson.person, but not for groupPerson.roles.  I got my code working by adding @Serialize to the Set<String> roles parameter inside the @Embed GroupPerson class.

Andy