Implicit Conversion of 'BOOL'(aka 'bool') to 'id' is disallowed by ARC

Question

I am trying to transform a value of Pending/Completed to a boolean True/False value

Here is the code for that:

RKValueTransformer *transformer = [RKBlockValueTransformer valueTransformerWithValidationBlock:^BOOL(__unsafe_unretained Class sourceClass, __unsafe_unretained Class destinationClass) {
        return ([sourceClass isSubclassOfClass:[NSNumber class]]);
    } transformationBlock:^BOOL(NSNumber *inputValue, __autoreleasing id *outputValue, __unsafe_unretained Class outputClass, NSError *__autoreleasing *error) {
        // validate the input
        RKValueTransformerTestInputValueIsKindOfClass(inputValue, [NSNumber class], error);
        if([inputValue isEqualToNumber:@(Completed)]) {
            *outputValue = YES;
        } else if([inputValue isEqualToNumber:@(Pending)]){
            *outputValue = FALSE;
        }
        return YES;
    }];

However, I get the error: Implicit Conversion of 'BOOL'(aka 'bool') to 'id' is disallowed by ARC

When i try to set the outputValue to be YES...

What's going on here?

It should match this output:

{ 
   “IsCompleted”: true (nullable),
   “Desc”: null (“new description” on edit) 
}

BOOL is not a class - you will need to return an NSNumber that wraps your BOOL value — Paulw11, Aug 03 '15 at 21:48
I did use google and nothing useful showed up. Let me know if you can actually answer my question — Varun Varahabotla, Aug 03 '15 at 22:21

score 21 · Answer 1 · answered Aug 03 '15 at 21:57

21

The transformationBlock accepts an input object and needs to output a different object, but BOOL is an intrinsic type, not an object type, so you can't set *output to a straight boolean value.

You can set it to an NSNumber object that wraps the Boolean value -

*output=[NSNumber numberWithBool:YES];

Or use the shorthand

*output=@YES;

answered Aug 03 '15 at 21:57

Paulw11

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Isn't this just setting the value to 0 or 1? – Varun Varahabotla Aug 03 '15 at 22:03
Basically, yes. I don't know the context of your code, but if you want a bool you should probably just use an if statement instead of the transformer. – Paulw11 Aug 03 '15 at 22:04
This is a rest kit call – Varun Varahabotla Aug 03 '15 at 22:07
Depending on the value of `Pending` and `Completed` your transformer code probably isn't doing anything – Paulw11 Aug 03 '15 at 22:20
Its part of the Restkit framework, in order to transform values you need to go through the transformation block – Varun Varahabotla Aug 04 '15 at 16:24
Yes, but you are transforming an NSNumber into an NSNumber, so you probably don't need to transform this value – Paulw11 Aug 04 '15 at 21:17
I need a BOOl value, as in the JSON i'm going to be outputting needs to have a true/false value.. – Varun Varahabotla Aug 05 '15 at 02:08
That is what you have, effectively. You can't have a bool because that isn't an object. An object equivalent to a bool is an NSNumber with a value of 0 or 1. You could also transform to the strings "true" and "false" - it really depends on what your JSON needs to look like. – Paulw11 Aug 05 '15 at 03:43
Check the updated question for the expected JSON output – Varun Varahabotla Aug 05 '15 at 15:45
That looks to me that you need to transform it to a string – Paulw11 Aug 05 '15 at 20:55

Implicit Conversion of 'BOOL'(aka 'bool') to 'id' is disallowed by ARC

1 Answers1