Hi Andrus, Yes, superclass/subclass. We are using Cayenne.objectForQuery(...);
Specifically, Cayenne.*objectForQuery*(dataContext, *new* ObjectIdQuery(oid, *false*, ObjectIdQuery.*CACHE*)); On Wed, May 18, 2016 at 10:11 AM, Andrus Adamchik <and...@objectstyle.org> wrote: > > I have a question and an observation. While reading some of the Cayenne > > code, we've noticed reference to a snapshot cache. Is this the object > > cache, or something different? > > Correct. This is shared object cache. > > > The issue we are seeing has to do with cayenne objects that are > > parents/children of other cayenne objects. For instance, we have a User > > object, we also have Staff and Patient objects that are children of the > > User object. > > By parent/child you mean superclass/subclass? > > > > > What we have seen is that if a developer does a query for a User object > by > > id, the object is retrieved. Cayenne sees that this object is a Staff > > object and then stores it in the object cache as a Staff object. The next > > time the user goes to retrieve the User object (by the same id), Cayenne > > does another call to the database, because it cannot find the User object > > in the cache (because it stored it as a Staff object). > > Could be a bug. Which API are you using? Cayenne.objectForPK(..) ? > > Andrus > > > > > On May 18, 2016, at 4:31 PM, Frank Herrmann < > frank.herrm...@modernizingmedicine.com> wrote: > > > > Hello all, > > > > I have a question and an observation. While reading some of the Cayenne > > code, we've noticed reference to a snapshot cache. Is this the object > > cache, or something different? > > > > The issue we are seeing has to do with cayenne objects that are > > parents/children of other cayenne objects. For instance, we have a User > > object, we also have Staff and Patient objects that are children of the > > User object. > > > > What we have seen is that if a developer does a query for a User object > by > > id, the object is retrieved. Cayenne sees that this object is a Staff > > object and then stores it in the object cache as a Staff object. The next > > time the user goes to retrieve the User object (by the same id), Cayenne > > does another call to the database, because it cannot find the User object > > in the cache (because it stored it as a Staff object). > > > > Thanks again for the help. > > > > -Frank > > > > -- > > FRANK HERRMANN > > SOFTWARE ENGINEER > > > > T: 561-880-2998 x1563 > > > > E: frank.herrm...@modmed.com > > > > > > > > [image: [ Modernizing Medicine ]] <http://www.modmed.com/> > > [image: [ Facebook ]] <http://www.facebook.com/modernizingmedicine> > [image: > > [ LinkedIn ]] <http://www.linkedin.com/company/modernizing-medicine/> > [image: > > [ YouTube ]] <http://www.youtube.com/user/modernizingmedicine> [image: [ > > Twitter ]] <https://twitter.com/modmed_EMA> [image: [ Blog ]] > > <http://www.modmed.com/BlogBeyondEMR> [image: [ Instagram ]] > > <http://instagram.com/modernizing_medicine> > > -- FRANK HERRMANN SOFTWARE ENGINEER T: 561-880-2998 x1563 E: frank.herrm...@modmed.com [image: [ Modernizing Medicine ]] <http://www.modmed.com/> [image: [ Facebook ]] <http://www.facebook.com/modernizingmedicine> [image: [ LinkedIn ]] <http://www.linkedin.com/company/modernizing-medicine/> [image: [ YouTube ]] <http://www.youtube.com/user/modernizingmedicine> [image: [ Twitter ]] <https://twitter.com/modmed_EMA> [image: [ Blog ]] <http://www.modmed.com/BlogBeyondEMR> [image: [ Instagram ]] <http://instagram.com/modernizing_medicine>
