receiving the error response with AFHTTPClient calls - json

Question

I'm implementing AFHTTPClient as a singleton class, as recommended in the docs, and calling that with JSON data in a post, and receiving JSON data in return:
[[BMNetworkCalls sharedInstance] postPath:theURL parameters:theDict success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(#"my return is: %#", [responseObject valueForKeyPath:#"Result"]);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"error in network call: %#", [error localizedDescription]);
}];
All fine and good, but if I receive an error, ("error in HTTPRequestOperation: Expected status code in (200-299), got 400"), I actually want to read the responseObject here as well (this is the way the API I am using tells me what class of error I caused).
I could do that using AFJSONRequestOperation:
AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
NSLog(#"my return is: %#", [JSON valueForKeyPath:#"Result"]);
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
NSLog(#"exception code: %#", [JSON valueForKeyPath:#"ExceptionCode"]);
NSLog(#"exception message: %#", [JSON valueForKeyPath:#"ExceptionMessage"]);
}];
[operation start];
How can I (and can I?) do it using AFHTTPClient?

Answer 1

The operation variable has everything that you need:
[[BMNetworkCalls sharedInstance] postPath:theURL parameters:theDict success:^(AFHTTPRequestOperation *operation, id responseObject) {
// ...
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
if ([operation isKindOfClass:[AFJSONRequestOperation class]]) {
id JSON = [(AFJSONRequestOperation *)operation responseJSON];
NSLog(#"JSON: %#", JSON)
}
}];

Answer 2

All credit goes to #phix23, who pointed me in the correct direction!
Here is the custom method I wrote in my subclassed AFHTTPClient that allows me to see the JSON response after receiving a 400 error:
- (void) myPostPath:(NSString *)path
parameters:(NSDictionary *)parameters
success:(void (^)(NSURLRequest *request, NSHTTPURLResponse *response, id JSON))success
failure:(void (^)(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON))failure
{
NSURLRequest *request = [self requestWithMethod:#"POST" path:path parameters:parameters];
AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:success failure:failure];
[self enqueueHTTPRequestOperation:operation];
}
I call it by:
[[BMNetworkCalls sharedInstance] myPostPath:theURL parameters:theDict success:^(NSURLRequest *request, NSHTTPURLResponse *response, id responseObject) {
NSLog(#"my return is: %#", [responseObject valueForKeyPath:#"Result"]);
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
NSLog(#"exception code: %#", [JSON valueForKeyPath:#"ExceptionCode"]);
}];