Add Restkit relationship mapping with key path different than relationship name

Question

I'm attempting to add a relationship mapping to one of my request mappings.

The POST request should send body content as such:

{"account":{"key":"the_key_goes_here","terms_of_service":1,"person_attributes":{"email":"test@example.com"}}}

I have setup the account mapping to be:

NSMutableDictionary *accountAttributes = [NSMutableDictionary dictionaryWithDictionary: @{@"key":@"key",@"terms_of_service":@"terms_of_service",@"source":@"source"}];
RKObjectMapping *requestMapping = [RKObjectMapping requestMapping];
[requestMapping addAttributeMappingsFromDictionary:accountAttributes];

Now, in an attempt to add the person_attributes to the request, I do the following:

NSMutableDictionary *userAttributes = [NSMutableDictionary dictionaryWithDictionary: @{@"first_name":@"first_name",@"last_name":@"last_name",@"email":@"email"}];
RKObjectMapping *userMapping = [RKObjectMapping requestMapping];
[userMapping addAttributeMappingsFromDictionary:userAttributes];
[requestMapping addRelationshipMappingWithSourceKeyPath:@"person" mapping:userMapping];

However, this always sends as:

{"account":{"key":"the_key_goes_here","terms_of_service":1,"person":{"email":"test@example.com"}}}

In an attempt to change person to person_attributes I modify the relationshipmappingwithsourcekeypath to:

[requestMapping addRelationshipMappingWithSourceKeyPath:@"person_attributes" mapping:userMapping];

But, it fails with an error every time, stating: the entity Account is not key value coding-compliant for the key "person_attributes"

I understand this is because the Account doesn't have a person_attributes value. Is there a way to add the keypath as person but have it send as person_attributes?

Thanks for your help in advance!

Answer 1

You need to use the RKRelationshipMapping class and the relationshipMappingFromKeyPath:toKeyPath:withMapping: method to create the relationship and then set it with addPropertyMapping:.