NSPredicate case-insensitive matching on to-many relationship

Question

I am implementing a search field where the user can type in a string to filter the items displayed in a view. Each object being displayed has a keywords to-man

Answer 1

If you is trying to catch only the equals names but with insensitive case, I think it is the best solution

[NSPredicate predicateWithFormat:@"ANY keywords.name LIKE[c] %@", ...];

You helped me a lot. Thanks guys!!!

In my case I did:

[NSPredicate predicateWithFormat:@"ANY name LIKE[c] %@", @"teste"];

Answer 2

If I understand you correctly, you want your predicate to be true whenever any keywords name matches the search string. For this you need to test with the ANY keyword like this:

[NSPredicate predicateWithFormat:@"ANY keywords.name CONTAINS[c] %@", ...];

This will search the keywords and return true if any of those keywords name contains your search string.

Answer 3

If you want both case insensitive and wildcard, use this:

NSPredicate *predicate = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"(name like[c] '*%@*')",@"search"]];

Answer 4

I believe the answer is:

[NSPredicate predicateWithFormat:@"keywords.name CONTAINS[cd] %@", self.searchString];

String comparisons are by default case and diacritic sensitive. You can modify an operator using the key characters c and d within square braces to specify case and diacritic insensitivity respectively, for example firstName BEGINSWITH[cd] $FIRST_NAME.

Predicate Format String Syntax

Answer 5

If you must match the keyword but the search must be case-insensitive then you should use NSPredicate(format: "keywords.name =[c] %@", self.searchString)

LIKE does not work on string literals.