Question

I can get a predicate like

ANY alpha.prop LIKE $SEARCH_TERM

to work where alpha is a to-many relationship, but how do I get

ANY alpha.beta.prop LIKE $SEARCH_TERM

to work where alpha is a to-many relationship and beta is a to-many relationship on alpha, this throws the exception ‘multiple to-many keys not allowed here‘.

Answer 1

Ok the way to do this is to do the search on bottom child element instead so the query string becomes

prop LIKE $SEARCH_TERM

and then enumerate through the result and grab the parent of the parent and stick them in a set to remove duplicates, like

NSMutableSet  * mySet = [NSMutableSet set];
for( MyChild * c in [self.managedObjectContext executeFetchRequest:theFetchRequest error:&theError] )
{
    [mySet addObject:c.parent.parent];
}