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!)
--
Paul Hoadley
http://logicsquad.net/
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