title: Adding two request descriptors for a given class in Restkit 0.2
body: <p>I need to make two different types of POST coming from the User class.</p>
  
  <pre><code>//JSON Type A
  {
      "password":"12345",
      "email":"test@gmail.com"
  }
  
  //JSON Type B
  {
     "user":{
        "Password":"12345",
        "Email":"sample@gmail.com"
     }
  }
  </code></pre>
  
  <p>I've tried to make two request descriptors and adding them to my object manager however I get the error</p>
  
  <blockquote>
    <p>"Cannot add a request descriptor for the same object class as an
    existing request descriptor."</p>
  </blockquote>
  
  <p>My code</p>
  
  <pre><code>@interface User : NSObject
  
  @property (nonatomic, retain) NSString * userID;
  @property (nonatomic, retain) NSString * email;
  @property (nonatomic, retain) NSString * password;
  @property (nonatomic, retain) NSString * firstName;
  @property (nonatomic, retain) NSString * lastName;
  
  @end
  
  - (void)setupUserMapping:(RKObjectManager *)objectManager {
  
      // Setup user response mappings
      RKObjectMapping *userMapping = [RKObjectMapping mappingForClass:[User class]];
      [userMapping addAttributeMappingsFromDictionary:@{
       @"ID" :@"userID",
       @"Email" : @"email",
       @"Password" : @"password",
       @"FirstName" : @"firstName",
       @"LastName" : @"lastName",
       }];
  
  
      RKResponseDescriptor *responseDescriptorAuthenticate = [RKResponseDescriptor responseDescriptorWithMapping:userMapping
                                                                                         pathPattern:@"/Authenticate"
                                                                                             keyPath:nil
                                                                                         statusCodes:[NSIndexSet indexSetWithIndex:200]];
  
  
      RKResponseDescriptor *responseDescriptorRegister = [RKResponseDescriptor responseDescriptorWithMapping:userMapping
                                                                                                     pathPattern:@"/Register"
                                                                                                         keyPath:nil
                                                                                                     statusCodes:[NSIndexSet indexSetWithIndex:200]];
      [objectManager addResponseDescriptor:responseDescriptorRegister];
      [objectManager addResponseDescriptor:responseDescriptorAuthenticate];
  
      // Setup user request mappings
      RKObjectMapping* userRequestMappingForRegister = [RKObjectMapping requestMapping];
      [userRequestMappingForRegister addAttributeMappingsFromDictionary:@{
       @"email" : @"Email",
       @"password" : @"Password",
       @"firstName" : @"FirstName",
       @"lastName" : @"LastName",
       }];
      RKRequestDescriptor *requestDescriptorForRegister = [RKRequestDescriptor requestDescriptorWithMapping:userRequestMappingForRegister objectClass:[User class] rootKeyPath:@"user"];
  
  
      RKObjectMapping* userRequestMappingForAuthenticate = [RKObjectMapping requestMapping];
      [userRequestMappingForAuthenticate addAttributeMappingsFromDictionary:@{
       @"userID" :@"ID",
       @"email" : @"email",
       @"password": @"password"
       }];
      RKRequestDescriptor *requestDescriptorForAuthenticate = [RKRequestDescriptor requestDescriptorWithMapping:userRequestMappingForAuthenticate objectClass:[User class] rootKeyPath:nil];
  
      [objectManager addRequestDescriptor:requestDescriptorForRegister];
      [objectManager addRequestDescriptor:requestDescriptorForAuthenticate];
  }
  </code></pre>
  
  <p>Does anyone know how I can solve this problem without creating a separate class for these requests? </p>
  
  <p>Any help is appreciated. </p>
  
  <p>Thanks.</p>