Swagger-codegen: [Swift] Get Status code from error

[jannhendrik]

Description

I wasn't able to get the status code after making a request. My approach was:

let request = UserdetailcontrollerAPI.createUsingPOST2WithRequestBuilder(userInfo: userInfo);
      request.execute {response, error in
            if(error != nil){
                let err = error as! ErrorResponse
                print(err)

                switch(error!){
                    case (409,_,_): print("409");
                }
}

Since error is of type Error? I get a "Tuple pattern cannot match values of the non-tuple type: Error"

Swagger-codegen version

I am using the current master branch of swagger 2.0. (Code is generated from a spring server.)

Swagger declaration file content or url

```yaml
swagger: '2.0'
info:
description: Api Documentation
version: '1.0'
title: Api Documentation
termsOfService: 'urn:tos'
contact: {}
license:
name: Apache 2.0
url: 'http://www.apache.org/licenses/LICENSE-2.0'
host: 'localhost:8080'
basePath: /

...
```

Command line used for generation

java -jar swagger-codegen-cli.jar generate -i project.json -l swift3 -o ../project_swagger

Steps to reproduce

Related issues

Suggest a Fix

I needed this immediately so I changed the type of ErrorResponse to in Models.mustache. I don't understand the idea of the original code anyhow. Maybe someone can explain it?

```swift
public typealias ErrorResponse = (Int, Data?, Error?);

/*
public enum ErrorResponse : Error {
case Error(Int, Data?, Error)
}
*/

[wing328]

@jannhendrik can you please confirm you're using the latest master to generate the Swift API client?

cc @jaz-ah @Edubits

[jannhendrik]

@wing328 Yes I was using the current master branch. Sorry for late answer.

[jaz-ah]

@jannhendrik looks like you want switch(err) not switch(error)

[jannhendrik]

That would not make a difference... ErrorResponse still inherits Error, which is not a tuple and thus can not be switched in that form.

[btaitelb]

This works in v2.2.2 in swift3:

if let err = error as? ErrorResponse {
    switch(err){
        case .Error(409, _, _): print("409");
    }
}

[jaz-ah]

@btaitelb what's the error you get then at this point in master with that same code?

[btaitelb]

@jaz-ah sorry, I wasn't clear in my comment. I meant that this compiles and runs correctly without error on master. I found this thread by googling how to deal with the ErrorResponse, so figured it could use a working example.