[realm setBaseUrl:@"http://api.example.com" queuePersistance:RestRequestQueuePeristanceDatabase];

@interface User : RLMObject
@property NSString* username;
@property NSString* name;
@end

[User restInDefaultRealmWithRequestType:RestRequestTypePost
    parameters:@{
        RestRequestParameterStyleJSON : @{
            ”username”:”foo”,
            ”password”:”bar”
        }}
    headers:nil
    userInfo:@{@"action":@"login"}
    success:^(id primaryKey) {
        User *user = [User objectForPrimaryKey:primaryKey];
        //Use object
    }
    failure:^(NSError *error, NSDictionary *userInfo) {
        //Handle error
    }
];