Hi all,
I have a Core Data object model that I'm trying to write a fetch predicate for
(to use for search). Quick explanation of the model:
We'll call the main entity "Book". There's also a "Keyword" entity. The Book
entity has a to-many relationship with the Keyword entity called "keywords". In
turn, the Keyword entity has an inverse relationship with the Book entity
called "book". The Keyword entity has a single attribute called "name". So
basically, each Book has Keywords that describe it.
For my search, I have an array of search terms. I need a predicate that I can
use on fetch requests for the Book entity that will evaluate to TRUE if ALL of
the search terms have a corresponding Keyword in that the "name" property
begins with the search term.
For example:
There are three books:
Book1 - keywords: {"fiction", "scifi"}
Book2 - keywords: {"nonfiction"}
If the search terms were {"fic", "nonfic", "sci"} the resulting fetched array
would contain NOTHING because none of the books have keywords that begin with
all 3 of those search terms..
However, if the search terms were {"fic", "sci"}, the resulting fetched array
would contain Book1 since its keywords "fiction" and "scifi" begin with the two
search terms "fic" and "sci". The key part here is that ALL of the search
terms have to have a corresponding keyword as demonstrated above for the
predicate to evaluate to true.
I hope I've explained this problem well enough, it's hard to put this stuff
into words ;-)
Any help is appreciated,
Indragie_______________________________________________
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