NSFetchRequest With NSPredicate in Core Data

Question

I have an attribute of type NSData and I want to search a string in this attribute how can I perform this search using NSPredicate?

I try to use NSPredicate with block but predicate with block not supported for Core Data SQlite based store.

score 3 · Answer 1 · answered Apr 28 '13 at 14:07

You can't do that easily. The reason for predicates with blocks do not work is that it is not implemented in the SQLite store because it would not be trivial to do so in an efficient manner.

You could have a second attribute which contains a string representation of that data or a condensed version of the string representation and use this attribute instead.

You have to make sure to keep those attributes in sync and make sure both attributes are not transient.

score 0 · Accepted Answer · answered Apr 28 '13 at 14:07

0

Why do you have an NSData attribute? Transform it to NSString when you store it and change your data model accordingly.

It is senseless to store a string in a data object.

answered Apr 28 '13 at 14:07

Mundi

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i have NSData Because this Is HTML PAGE Content – Tefa Apr 28 '13 at 14:09
Well, transform it to string when importing. My point exactly. – Mundi Apr 28 '13 at 14:11
Ok Thank you, Do you know Any answers ? – Tefa Apr 28 '13 at 14:14
Can i do this with NSEXPression – Tefa Apr 28 '13 at 14:14

NSFetchRequest With NSPredicate in Core Data

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