> 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>
