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Google App Engine Objectify - load single objects or list of keys?


Google App Engine Objectify - load single objects or list of keys?

By : Matt Steele
Date : November 18 2020, 01:01 AM
will help you Method A loads entities one by one while method B does a bulk load, which is cheaper, since you're making just 1 network roundtrip to Google's datacenter. You can observe this by measuring time taken by both methods while loading a bunch of keys multiple times.
While doing a bulk load, you need to be cautious about loaded entities, if datastore operation throws exception. Operation might succeed even when some of the entities are not loaded.
code :


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Google App Engine Objectify querying big objects VS separated objects (head and body)

Google App Engine Objectify querying big objects VS separated objects (head and body)


By : mdsitest3 mdsitest3
Date : March 29 2020, 07:55 AM
Hope this helps It is fine to have the details on the same kind, it will save you from needing additional trips to the datastore. As you noted, it is a good idea to mark any properties you do not need to query or order by as unindexed since it improves write performance and reduces storage space.
You might find the articles on mastering the datastore useful. They explain more of the details about how entities and indexes are built and stored.
Objectify GAE/J Google App Engine: Understanding asynchronous load

Objectify GAE/J Google App Engine: Understanding asynchronous load


By : mtes92
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , This was answered here:
https://groups.google.com/forum/?fromgroups=#!topic/objectify-appengine/8dLAbSWJVB4
Google App Engine: Fastest way to get a large collection of objects from Keys using objectify

Google App Engine: Fastest way to get a large collection of objects from Keys using objectify


By : Ken Springhetti
Date : March 29 2020, 07:55 AM
should help you out I have a large (about 20000) objects that I want to retrieve based on user IDs contained in AlertSubscription. This takes 20+ seconds on GAE and I wonder if it is possible to get this faster? I have already retrieved 20000 AlertSubscriptions objects in 5 seconds using a standard Query so I think it's strange that the DeviceInfo objects should take 20+ seconds. , This resolved it for me:
code :
ObjectifyOpts opts = new ObjectifyOpts();
opts.setConsistency(Consistency.EVENTUAL);
Objectify ofy = ObjectifyService.begin(opts);
foreign keys in objectify / google app engine

foreign keys in objectify / google app engine


By : Jadav Ramesh
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , What you can do is have a property Ref on the Message entity and annotate it with '@Parent'. This means that each Message entity will become part of the user's entity group. The Ref works like a key but allows you to directly access the actual entity object; that way you can easily get the forename, surname etc.
Change your class as follows:
code :
@Entity
@Cache
public class Message
{
    @Id Long id;
    @Load @Parent private Ref<User> user;

    public User getUser() { return this.user.get(); }
    public void setUser(User value) { this.user = Ref.Create(value); }
}
public static List<Message> getSentMessages(long userId) 
{
    User parent = ofy().load().type(User.class).id(userId).now();
    List<Message> results = ofy().load().type(Message.class).ancestor(parent).limit(1000).list();   
    return results;
}
Objectify List<Ref<T>> not serialized by Google App Engine endpoints

Objectify List<Ref<T>> not serialized by Google App Engine endpoints


By : Danie Heath
Date : March 29 2020, 07:55 AM
around this issue The solution was pretty simple... Just hide the Ref field. It does now provide any value to the API consumer and it just create trouble to the parser:
I replaced the List> getter and setter by:
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