Alamofire automatic validation

Sometimes, you will want to use Alamofire automatic validation for some requests. When a request is configured with Alamofire validation, Moya will internally call Alamofire's validate() method on the concerned DataRequest.

swift

// MARK: - TargetType Protocol Implementation
extension MyService: TargetType {
    var baseURL: URL { URL(string: "https://api.myservice.com")! }
    var path: String {
        switch self {
        case .zen:
            return "/zen"
        case .showUser(let id):
            return "/users/\(id)"
        case .createUser:
            return "/users"
        case .showAccounts:
              return "/accounts"
        }
    }
    
    // Other needed configurations
    // ...
    
    // Validate setup is not required; defaults to `.none`
    // for all requests unless specified otherwise.
    var validationType: ValidationType {
        switch self {
        case .zen, .showUser, .showAccounts:
            return .successCodes
        case .createUser(let firstName, let lastName):
            return .none
        }
    }
}

Moya allows you to configure the Alamofire validation behavior through the ValidationType enum.

You can choose from four cases:

.none which does not perform any validation.
.successCodes which validates requests with status codes 200 - 299.
.successAndRedirectCodes which validates requests with status codes 200 - 399.
.customCodes([Int]) which only validates the given status codes.

The default validation type for all requests is ValidationType.none.

Alamofire automatic validation can be useful, for example if you want to use the Alamofire's RequestRetrier and RequestAdapter, for an OAuth 2 ready Moya Client.

Also, if validation fails, you can get the response from the returned MoyaError.

swift

provider.request(target) { result in
    ...
    if case let .failure(error) = result {
        response = error.response
        // Do something with the response
    }
    ...
}