RestKit mapping array of string and a keyPath value at same Object

Question

I've looking for an answer for hours, I have no ideia what to do.

I have a JSON that I need to map, which has an array of string with no keyPath, but also has an attribute that needed to be mapped which has a keyPath. I was using RestKit 0.21.0, and had the same error when I updated to RestKit 0.22.0.

JSON:

{
  "content": {
    "site": "www.inf.ufsc.br/~fcdocil",
    "modulos": [
      "noticias",
      "fotos",
      "conteudo"
    ]
  }
}

RKResponseDescriptor:

RKEntityMapping *moduleMapping = [RKEntityMapping mappingForEntityForName:@"Module" inManagedObjectStore:store];
    [moduleMapping addPropertyMapping:[RKAttributeMapping attributeMappingFromKeyPath:nil toKeyPath:@"type"]];
    [moduleMapping addAttributeMappingsFromDictionary:@{@"@parent.site" : @"site"}];

    RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:moduleMapping method:RKRequestMethodAny pathPattern:nil keyPath:@"content.modulos" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

When I run this, it successful map the array in 3 different element, as you can see here:

SUCCESS (
    "<Module: 0x8e54280> (entity: Module; id: 0x8cd31f0 <x-coredata://B31664A2-091E-43B8-9B36-EB7AF6C27292/Module/p4> ; data: {\n    site = nil;\n    type = noticias;\n})",
    "<Module: 0x8e666b0> (entity: Module; id: 0x8cd3180 <x-coredata://B31664A2-091E-43B8-9B36-EB7AF6C27292/Module/p2> ; data: {\n    site = nil;\n    type = fotos;\n})",
    "<Module: 0x8e66a60> (entity: Module; id: 0x8cd3170 <x-coredata://B31664A2-091E-43B8-9B36-EB7AF6C27292/Module/p3> ; data: {\n    site = nil;\n    type = conteudo;\n})"
)

But It didn't do the @parent.site, which I desire is:

SUCCESS (
    "<Module: 0x8e54280> (entity: Module; id: 0x8cd31f0 <x-coredata://B31664A2-091E-43B8-9B36-EB7AF6C27292/Module/p4> ; data: {\n    site = www.inf.ufsc.br/~fcdocil;\n    type = noticias;\n})",
    "<Module: 0x8e666b0> (entity: Module; id: 0x8cd3180 <x-coredata://B31664A2-091E-43B8-9B36-EB7AF6C27292/Module/p2> ; data: {\n    site = www.inf.ufsc.br/~fcdocil;\n    type = fotos;\n})",
    "<Module: 0x8e66a60> (entity: Module; id: 0x8cd3170 <x-coredata://B31664A2-091E-43B8-9B36-EB7AF6C27292/Module/p3> ; data: {\n    site = www.inf.ufsc.br/~fcdocil;\n    type = conteudo;\n})"
)

I'm using CoreData to save the data, and my ManagedObject is like that,

Module.h

@interface Module : NSManagedObject

@property (nonatomic, retain) NSString * type;
@property (nonatomic, retain) NSString * site;

@end

Module.m

@implementation Module

@dynamic type;
@dynamic site;

@end

I really have no ideia what I'm doing wrong, so any suggestions would be appreciated. Thanks

Wain · Accepted Answer · 2013-11-25 08:49:38Z

1

When you set the response descriptor key path to @"content.modulos" you are asking RestKit to throw away all of the higher and sibling information from the JSON (during the mapping process). So the @parent information doesn't exist.

You can't really map into your current desired structure. RestKit expects that you will map the site to one object and then map the modulos to another object (using a nested mapping connected with RKRelationshipMapping) and use a relationship to connect them. In this way you could use @parent, but you would no longer need to. Your single response descriptor would use the site mapping and a key path of @"content".

answered Nov 25, 2013 at 8:49

Wain

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2 Comments

Felipe Docil Over a year ago

Thank you, I didn't want use relationship because this data is going to fill a TableView, so it's much easier when you fetch the table Module and then use a predicate to select the site which you desire. Well but if it's the RestKit design I only have to follow. And I won't choose your answer since wasn't what I was looking for, although it was helpful. Thank you again.

Wain Over a year ago

Predicates can traverse relationships so you can do your table and filter. The only thing to keep in mind is that if you use an FRC then it won't update for changes in the relationships content.

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