Implicit conversion of NSInteger error

Question

Using MagicalRecord, I am trying to get the record with a particular clientNumber which is a NSInteger (defined as int16 as the data type).

This is my line of code where I'm getting the error:

ClientInfo *clientSelected = [ClientInfo MR_findFirstByAttribute:@"aClientNumber" withValue: clientNumber inContext:localContext];

UPDATE: This is the definition of MR_findFirstByAtytribute:

MR_findFirstByAttribute:(NSString *) withValue:(id)

This is the error I'm getting:

Implicit conversion of NSInteger (aka int) is disallowed with ARC

For the life of me, I don't see what's wrong. ClientInfo is defined as

@interface ClientInfo : NSManagedObject

It's saying you're trying to use NSInteger -- a "scalar" -- where an object pointer is expected. — Hot Licks, Dec 19 '12 at 17:15
That makes absolutely no sense to me... then what's it supposed to be? — SpokaneDude, Dec 19 '12 at 17:19
We can't tell precisely what it's supposed to be without seeing the MR_findFirstAttribute method description, but it it's expecting an NSNumber you need to use `[NSNumber numberWithInt:clientNumber]` — Hot Licks, Dec 19 '12 at 17:22
(I agree that it's a stupid -- very unhelpful -- error message. Even those of us with decades in the biz were scratching our heads for a couple of minutes the first time we saw it.) — Hot Licks, Dec 19 '12 at 17:24
Updated the question... still not working with [NSNumber numberWithInt: clientNumber]... clientNumber is defined as NSInteger. The problem appears to be the conversion of NSInteger to id, which I can't seem to figure out. — SpokaneDude, Dec 19 '12 at 17:27
You should not still be getting the "Implicit conversion" message if you're passing an NSNumber as the second parameter on that call. (But note that you did not include the entire definition of that method -- you're missing the inContext parm.) — Hot Licks, Dec 19 '12 at 17:30
(Though you might get a different "Implicit conversion" message from numberWithInt, if passing an NSInteger. Try numberWithInteger.) — Hot Licks, Dec 19 '12 at 17:33
You could also use the new literals syntax: `ClientInfo *clientSelected = [ClientInfo MR_findFirstByAttribute:@"aClientNumber" withValue: @(clientNumber) inContext:localContext];` — Alladinian, Dec 19 '12 at 17:34
HotLicks: please take your comment and make an Answer with it (the one about using [NSNumber numberWithInteger:clientNumber])... it got rid of the error, and I now understand what to do. Thank you. — SpokaneDude, Dec 19 '12 at 17:36
You can check the answer by @mipadi -- it's essentially the same and he posted about the same time. — Hot Licks, Dec 19 '12 at 23:44

score 36 · Answer 1 · edited Jan 19 '22 at 18:06

36

The parameter type for withValue is an id (a pointer). NSInteger is a scalar value (not an object) and cannot be converted to a pointer value implicitly.

This is purely a guess, but creating an NSNumber from the NSInteger might work:

NSNumber *val = [NSNumber numberWithInteger:clientNumber];
ClientInfo *clientSelected = [ClientInfo MR_findFirstByAttribute:@"aClientNumber" withValue:val inContext:localContext];

edited Jan 19 '22 at 18:06

Maetschl

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answered Dec 19 '12 at 17:19

mipadi

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So how am I supposed to fix this? – SpokaneDude Dec 19 '12 at 17:20
XCode 4.5 now supports literal, with backward compatibility to iOS 4.3 so using `@(clientNumber)` looks more cleaner. – tia Dec 19 '12 at 17:57

score -1 · Answer 2 · answered Dec 19 '12 at 17:59

-1

As per your definition of method it's expecting and id and your are passing it a NSInteger aka int

answered Dec 19 '12 at 17:59

Inder Kumar Rathore

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Implicit conversion of NSInteger error

2 Answers2

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