How to find an object with a specific property which is in the array of an array, by using NSPredicate?

Question

Suppose I have the following objects

class A { 

NSArray *arrayOfB;
}

class B {

NSString *name;

}

Now, I have an array of As like below and each A contains 10 objects of B within its property arrayOfB.

NSArray *arrayOfAs; //contains objects of A

How can I get the objects of A depending upon specific match of name property of Bs inside of A, by using NSPredicate ?

I've tried googling, etc. and even writing various style of NSPredicate but did not succeed. Can anyone enlighten me how to do it?

This is what I tried so far:

NSPredicate *p = [NSPredicate predicateWithFormat:@"(SELF.name BEGINSWITH[c] %@ IN SELF.arrayOfB)",myText];

NSArray *mySearchedArrayOfAs = [arrayOfAs filteredArrayUsingPredicate:p];

But I run into error which says "Unable to parse the predicate".

Sergey Kalinichenko · Accepted Answer · 2014-03-01 14:28:43Z

4

I think you need to use ANY operator, like this:

NSPredicate *p = [NSPredicate predicateWithFormat:@"ANY arrayOfB.name BEGINSWITH[c] %@", myText];

answered Mar 1, 2014 at 14:28

Sergey Kalinichenko

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1 Comment

Sergey Kalinichenko Over a year ago

I do not have a setup to check this at the moment. Let me know if this does not work, and I'll delete the answer.

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