Question

anyone can help me to find a solution in this problem, i have this Core data model:

EDIT:
i formulate better my question, i want retrieve all taskes for a specifc name of the entity MyDate that have taskes.isView = NO and task date = today..

Answer 1

I would fetch on the Task entity with the predicate

[NSPredicate predicateWithFormat:@"taskDate.name == %@ && isView == NO", taskName]

to find Tasks whose taskDate has name taskName and isView is NO.

If, instead you need to find Tasks that hava a taskDate with the given name and any of the taskDate‘s taskes [sic] have isView==NO, then you need (fetching on MyDate entity):

[NSPredicate predicateWithFormat:@"name == %@ && ANY taskes.isView == NO"]

From the result resultSet of the fetch, you can get all of the Tasks using Key-Value Coding Collection Operators:

[resultSet valueForKeyPath:@"@distinctUnionOfSets.taskes"];