Hello,
I have two entities in a model: Teacher and School. There is a many-to-many relationship between Teacher and School, represented as Connection, a join entity. So, Teacher and School both have a 'connections' relationship, and Connection has both 'teacher' and 'school'. There are no flattened relationships. The Connection entity is modelled as a first class EO, as it contains other useful metadata.
Say I have a School S. I want a list of "unconnected Teachers" for S such that any Teacher T in that list has no Connection C in T.connections() such that C.school() returns S. This method in School produces the result I'm after:
public NSArray<Teacher> unconnectedTeachers() {
NSArray<Teacher> connectedTeachers = (NSArray<Teacher>) connections()
.valueForKey(Connection.TEACHER_KEY);
NSArray<Teacher> allTeachers = Teacher
.fetchAllTeachers(editingContext());
return ERXArrayUtilities
.arrayMinusArray(allTeachers, connectedTeachers);
}
But surely this is achievable with a single qualifier on Teacher? I tried this:
ERXQ.not(Teacher.CONNECTIONS.dot(Connection.SCHOOL).containsObject(this))
This looked promising in WOUnit testing, but fails to return the "unconnected Teachers" against an actual database. Does anyone have any suggestions? (Looking at you Dave A and Aaron!)
Do not post admin requests to the list. They will be ignored.
Webobjects-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden