ios - NSPredicate complex query -


i've got complex nspredicate problem cannot solve.

my data structure follows:

category - has many titles

title - has many products

title - has latestproduct property (title.latestproduct)

titles can excluded via excluded property (title.excluded = yes) products can excluded via excluded property (product.excluded = yes)

the result looking for: need fetch list of categories in system, want exclude categories where:

  • all category titles excluded (category.titles.excluded == yes)

or

  • all latest products excluded (category.titles.latestproduct.excluded == yes)

or (and tough part me)

  • the sum of count of (category.titles.excluded == yes) , count of (category.titles.latestproduct.excluded == yes) equal count of category titles (category.titles.count)

i can describe problem in plain english cannot work out proper way format predicate. appreciated thanks!

so worked out way using combination of clause subquery. predicate follows:

any producttitles.excluded == nil && subquery(producttitles, $x, subquery($x.products, $y, $y.excluded == nil).@count != 0 ).@count != 0

i think subquery how "any" clause works anyway not figure out how clause subquery of subquery.


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