CBLJSONEncoding - (instancetype)initWithJSON:(id)jsonObject not called when [CBLModelSubclass modelForDocument: doc]

[SeanDev]

Hi Guys,

I've been experimenting on CBLJSONEncoding which needs implementation of the CBLJSONEncoding protocol:

- (id)encodeAsJSON

- (instancetype)initWithJSON:(id)jsonObject

When saving the nesting CBLModel subclass, encodeAsJSON worked as expected. But when reading, I can only get a __NSCFDictionary, not the NSObject<CBLJSONEncoding> one. And the break point for - (instancetype)initWithJSON:(id)jsonObject is not reached.

Following are the code I tought might be useful, I think I must had missed something:

The Nesting CBLModel

@interface NestingModel : CBLModel
@property (readwrite) NSArray *nestedObjectArray; //An array of the following NestedObject
@end

@implementation NestingModel
@dynamic nestedObjectArray
@end

The Nested NSObject <CBLJSONEncoding>

@interface NestedObject : NSObject <CBLJSONEncoding>
@property (readwrite) NSString  *nestedObjectName;
- (instancetype)initWithJSON:(id)jsonObject;
- (id)encodeAsJSON;
@end

@implementation NestedObject
- (id)initWithJSON:(id)jsonObject {
    self = [self init];
    if(self) {
        self. nestedObjectName = jsonObject[@"nestedObjectName"];
    }    
    return self;
}

- (id)encodeAsJSON {
    return @{@"nestedObjectName" : self. nestedObjectName};
}
@end

[Nicolas Lapomarda]

You need to tell CBL that nestedObjectArray is an array of NestedObject objects.

You do that by adding this piece of code to your NestingModel implementation:

+ (Class)nestedObjectArrayItemClass

{

return [NestedObject class];

}

 Nico

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[SeanDev]

Thanks Nico for quick reply.

That solved my problem! Thanks again!

-Sean

[Jens Alfke]

You haven’t declared what type of objects are in nestedObjectArray. All the model class can tell is that the property is an NSArray, but it doesn’t know what’s in it. By default it just decodes the JSON objects in it normally, so in your case you get NSDictionaries.

To declare what the objects in the array should get decoded as, you need to add a method to your implementation like this:
+ (Class) nestedObjectArrayItemClass {
return [NestedObject class];
}

(This should be described in the CBLModel documentation. If it isn’t, let me know and I’ll get it added.)

—Jens

[lu...@lumobodytech.com]

How can I tell the NestedObject class, to return [NestedObject class]? I mean how to call + (Class)nestedObjectArrayItemClass this method?

[Jens Alfke]

> On Sep 13, 2015, at 10:38 AM, lu...@lumobodytech.com wrote:
>
> How can I tell the NestedObject class, to return [NestedObject class]? I mean how to call + (Class)nestedObjectArrayItemClass this method?

You don’t call +nestedObjectArrayItemClass. You just implement that method in your model subclass as a clue to tell CBLModel what class the array items should be. (It will call that method while getting the property value.)

—Jens