| Hi Paul and everyone,
What you did is ok - not bad but since you are asking for more here you go.
It is probably a bad idea to model the back relationship from “Role -> Users” as one role could be used by thousands of users. You don’t want to fault all those people in when you “addToBothSidesOfRelationshipWithKey().” That said you *could* model it and be careful to not add to both sides and be careful never to trip that fault. You could also model it as a “non class” invisible property. If you had this relationship you could do the following.
EOQualifier noticeQualifierForUser = Notice.ROLES.dot(Role.USERS).containsAnyObjectSatisfying(loggedInUser.identityQualifier())
You can use that one qualifier to fetch all the Notices for your user.
The “identityQualifier()” could be defined in your EO like so:
public EOQualifier identityQualifier() {
final EOEntity entity = entity();
final NSDictionary<String, Object> primaryKeyDictionary = primaryKeyDictionary(false /* inTransaction */);
final EOQualifier thatAreThis = entity.qualifierForPrimaryKey(primaryKeyDictionary);
return thatAreThis;
}
Note: “containsAnyObjectSatisfying()” is a thin wrapper of “ERXExistsQualifier.” If you prefer, you could create that exists qualifier directly and specify if you want an “in” or exists syntax to be generated.
On May 10, 2016, at 6:22 PM, Paul Hoadley < email@hidden> wrote: Hello,
I have two entities, User and Notice, each of which has a to-many relationship to Role called roles. The business rule here works as follows. Say Notice.roles contains two Roles, R1 and R2. If User.roles contains either R1 or R2, then the Notice is applicable to that User—that is, Notice.roles says that for each Role, the Notice applies to any User that has that Role.
I have a static method on Notice to return an NSArray<Notice> applicable to some supplied User. (There are other matching criteria, but this is the part I want to try and simplify.) At the moment, I’m doing this:
NSMutableArray<EOQualifier> roleQuals = new NSMutableArray<EOQualifier>(); for (Role r : user.roles()) { roleQuals.add(Notice.ROLES.containsObject(r)); } EOQualifier roleQual = ERXQ.or(roleQuals);
While this works, it seems awkward. Is there a way to create this qualifier (which is essentially looking for any match between User.roles and Notice.roles) in one step?
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