core data - Predicate subquery for products associated by tag -

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i have datamodel in core data such:

store <--->> product <<--->> tag

i'm looking create query matches products based on associated tags. typical use scenario choose search storea , output storeb. selecting storea list of storea products presented. let's pick producta list brings second viewcontroller. second viewcontroller lists relating productb's (because earlier set storeb output). i'm following this: predicate subquery return items matching tags want added store filter of products. subquery way go? how include filter selected store?


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