Hello everybody!
I've come across an issue with cross-model inheritance (single-table in this
case). For a minimal test setup I added an EOModel FrameworkUser to
ERMoviesLogic, containing an abstract parent entity AbstractUser and a concrete
child entity FrameworkUser. I added a second EOModel AppUser with a concrete
child of AbstractUser called AppUser to the ERModernMoviesTest app.
Fetching for all AbstractUser EOs does return all concrete child EOs, i.e. both
FrameworkUser and AppUser. Accessing attributes that are available on
AbstractUser is fine, but deleting an AppUser EO causes an exception:
java.lang.IllegalStateException: Unable to find entity for object
It turns out that the EOModel AppUser is not being added to the EODatabase when
the fetch is carried out.
Deletion with concrete child entity in FrameworkUser:
ERXDatabase.addModel: FrameworkUser
Feb 12 12:09:07 ERModernMoviesTest[9876] DEBUG NSLog - Using JDBCPlugIn
'H2PlugIn' for ERCompositeAdaptor@1026056307
Feb 12 12:09:07 ERModernMoviesTest[9876] DEBUG NSLog - connecting with
dictionary: {driver = "org.h2.Driver"; plugin = "H2PlugIn"; password =
"<password deleted for log>"; URL = "jdbc:h2:mem:ERModernMoviesTest"; }
Feb 12 12:09:07 ERModernMoviesTest[9876] DEBUG NSLog - === Begin Internal
Transaction
Feb 12 12:09:07 ERModernMoviesTest[9876] DEBUG NSLog - evaluateExpression:
<com.webobjects.jdbcadaptor._H2PlugIn$H2Expression: "SELECT t0.ACCESS_LEVEL,
t0.CUSTOMER_ID, RTRIM(t0.PASSWORD), RTRIM(t0.TYPE), t0.USER_ID, RTRIM(t0.LOGIN)
FROM rentalsuser t0 WHERE (t0.TYPE = ? OR t0.TYPE = ?)" withBindings:
1:"app"(type), 2:"framework"(type)>
Feb 12 12:09:07 ERModernMoviesTest[9876] DEBUG NSLog - 4 row(s) processed
Feb 12 12:09:07 ERModernMoviesTest[9876] DEBUG NSLog - === Commit Internal
Transaction
FetchTask._call: ringle: app
FetchTask._call: jboyles: app
FetchTask._call: lstark: app
FetchTask._call: jjeffers: framework
=> java.lang.IllegalStateException: Unable to find entity for object
<webobjectsexamples.businesslogic.common.AppUser pk:"4">
Deletion with only abstract parent entity AbstractUser in FrameworkUser:
ERXDatabase.addModel: FrameworkUser
Feb 12 12:11:36 ERModernMoviesTest[9876] DEBUG NSLog - Using JDBCPlugIn
'H2PlugIn' for ERCompositeAdaptor@22939787
Feb 12 12:11:36 ERModernMoviesTest[9876] DEBUG NSLog - connecting with
dictionary: {driver = "org.h2.Driver"; plugin = "H2PlugIn"; password =
"<password deleted for log>"; URL = "jdbc:h2:mem:ERModernMoviesTest"; }
Feb 12 12:11:36 ERModernMoviesTest[9876] DEBUG NSLog - === Begin Internal
Transaction
Feb 12 12:11:36 ERModernMoviesTest[9876] DEBUG NSLog - evaluateExpression:
<com.webobjects.jdbcadaptor._H2PlugIn$H2Expression: "SELECT t0.ACCESS_LEVEL,
t0.CUSTOMER_ID, RTRIM(t0.PASSWORD), RTRIM(t0.TYPE), t0.USER_ID, RTRIM(t0.LOGIN)
FROM rentalsuser t0 WHERE t0.TYPE = ?" withBindings: 1:"app"(type)>
Feb 12 12:11:36 ERModernMoviesTest[9876] DEBUG NSLog - 3 row(s) processed
Feb 12 12:11:36 ERModernMoviesTest[9876] DEBUG NSLog - === Commit Internal
Transaction
FetchTask._call: ringle: app
FetchTask._call: jboyles: app
FetchTask._call: lstark: app
=> java.lang.IllegalStateException: Unable to find entity for object
<webobjectsexamples.businesslogic.common.AppUser pk:"4">
Interestingly, the restricting qualifier is being correctly generated, i.e. it
contains the type for "app" and for "framework" EOs.
As a workaround, I add the following before the fetch
EODatabaseContext.registeredDatabaseContextForModel(ERXModelGroup.defaultGroup().modelNamed("AppUser"),
ec);
which forces the model to be loaded.
Now, my question is where can this be fixed in a generic manner? The fetch
causes an EOCooperatingObjectStoreNeededNotification notification to be sent,
which gets handled by EODatabaseContext._cooperatingObjectStoreNeeded(). But
that's a static method…
Fabian
P.S.: The fetch in question takes place in an EC created with an
EOObjectStoreCoordinator from the ERXTaskObjectStoreCoordinatorPool. AFAICT
this is only relevant in that the EOModel is more likely to not having been
added, compared to using an EOObjectStoreCoordinator that is shared among
sessions.
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