Swift Alamofire upload image in variable for rails API

Question

So here is my problem, I must upload an image in my swift application to a server that use rails. I got almost everything set up, except that the rails api must receive the file data in a variable document[:file]

here is the function I use to encode my image with alamofire:

static func getDocumentCreateUploadData(parameters: [String : AnyObject], imageData: NSData) -> (uploadData:NSMutableData, contentType:String) {
    let boundaryConstant = "NET-POST-boundary-\(arc4random())-\(arc4random())";
    let contentType = "multipart/form-data;boundary="+boundaryConstant

    let uploadData = NSMutableData()

    // add image
    uploadData.appendData("\r\n--\(boundaryConstant)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
    uploadData.appendData("Content-Disposition: form-data; name=\"file\"; filename=\"file.png\"\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
    uploadData.appendData("Content-Type: image/png\r\n\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
    uploadData.appendData(imageData)

    // add parameters
    for (key, value) in parameters {
        uploadData.appendData("\r\n--\(boundaryConstant)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
        uploadData.appendData("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n\(value)".dataUsingEncoding(NSUTF8StringEncoding)!)
    }
    uploadData.appendData("\r\n--\(boundaryConstant)--\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)

    return (uploadData, contentType)
}

And then I call my api with

var imageParameters = [
     "documents": [
          "documentable_type": "Profile",
          "documentable_id": user.profile.id!
     ]
]
let data = Router.getDocumentCreateUploadData(imageParameters, imageData: imageData)
let urlRequest = Router.CreateDocument(contentType: data.contentType)
Alamofire.upload(urlRequest, data.uploadData).validate().responseSwiftyJSON({ (request, response, json, error) in
    if error != nil {
       ...

What I would like to know is how can I encode the image so that it respect the api specification.

{
    "documents" : {
        "file": the_file,
        "documentable_type": the_documentable_type,
        "documentable_id": the_documentable_id
    }
}

Is there a way to achieve this?

Thank in advance.

Incognito · Accepted Answer · 2015-10-15 16:34:44Z

1

I simply misundertood the api, I didn't needed the root document in my upload call

All I needed to do was remove the document root but here is the way I did it :

    let imageParameters = [
        "documentable_type": "Comment",
        "organization_id": organizationId,
        "member_id": memberId,
        "user_id": user.id
    ]

    let uuid = NSUUID().UUIDString

    composeBarView.enabled = false
    ProgressHUDManager.uploadingStatus()

    Alamofire.upload(
        Router.CreateDocument,
        multipartFormData: { multipartFormData in
            multipartFormData.appendBodyPart(data: imageData!, name: "file", fileName: "\(uuid).jpg", mimeType: "image/jpeg")
            for (key, value) in imageParameters {
                multipartFormData.appendBodyPart(data: value.dataUsingEncoding(NSUTF8StringEncoding)!, name: key)
            }
        },
        encodingCompletion: { encodingResult in
            // Handle result
        }
    )

The API Evolved so the code is new but I hope it can help

edited Oct 15, 2015 at 16:34

answered May 27, 2015 at 20:44

Incognito

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2 Comments

Nagendra Rao Over a year ago

Could you upload the final code which worked for you?

Incognito Over a year ago

@Rao here you go, I modified my answer so that you can see :)

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