RestKit primary key attribute

7
votes

I load data from a json file, I save it. I do it twice ... I got two entries in my Core Data sqlite database. Even if I set in the mapping the primaryKeyAttribute.

 mapping.primaryKeyAttribute = @"code";
    [mapping mapAttributesFromArray :mappedFields];
    [[RKObjectManager sharedManager].mappingProvider setMapping:mapping forKeyPath:entityName];

My Json

{ "MyEntity": [ { "code" : "axv2","data" : "content"}]};

Here the callback :

- (void)objectLoader:(RKObjectLoader*)objectLoader didLoadObjects:(NSArray*)objects {

    NSLog(@"Entries loaded %d",[objects count]);
    lastResult = objects;

    for(MyEntity * myEntity in lastResult) {       
        [self saveContext];       
    }
}

My entity is correctly mapped ... But Restkit allow one to save duplicate entries with the same primary key?

It's weird, I understood that this primary key attribute would avoid this problem.

2
iosjsoncocoacore-datarestkit

2 Answers

1
votes

No, that is not the case, as Core Data keeps its own keys. You can easily solve this problem by checking if your primary key exists and before saving the entity instance in question.

0
votes

As of the latest RESTKit version (0.23.2) you can define the primary key like this:

[_mapping addAttributeMappingsFromDictionary:@{ @"id" : @"objectId", @"name" : @"name" }];
[_mapping setIdentificationAttributes:@[ @"objectId" ]];

Whereas objectId is you primary key on the core data object.