CODEWITHSUNDEEP
iosswiftcore-data
Christos Chadjikyriacou
Christos Chadjikyriacou

Reputation: 3759

NSPredicate for many - to - many relationship

I have two entities Offers and Categories which are connected via a many - to - many relationship.

In the entity Offers there is a boolean attribute called played and hasCategories which is the relationship with Categories.

Also in the entity Categories there is a boolean attribute called following.

I want to fetch all Offers which played = true and all its categories has following = true

How can I do this ?

Upvotes: 0

Views: 165

Answers (1)

Martin R
Martin R

Reputation: 540065

Something like this should work:

NSPredicate(format:"played = TRUE AND SUBQUERY(hasCategories, $c, $c.following = FALSE).@count = 0")

The subquery checks that none of the related categories has following == false.

Upvotes: 3

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