Titanium file upload

var currentMedia = false;

// Get photo
Ti.Media.showCamera({
  mediaTypes: [Ti.Media.MEDIA_TYPE_PHOTO],
  success: function(event) {
    var cropRect = event.cropRect;
    currentMedia = event.media;
  },
  error:function(error) {
    Ti.UI.createAlertDialog({title:'Camera problem', message:'Camera problem or device has no camera.'}).show();
  },
  allowImageEditing:true,
  saveToPhotoGallery:false
});


// Send photo
var xhr = Titanium.Network.createHTTPClient();
xhr.onerror = xhrOnError;

xhr.onload = function() {
  var json = JSON.parse(this.responseText);
  
  if (json.status === "ok") {
    showSuccess();
  } else {
    showError(json);
  }
};

var data = {"_method": "PUT", "photo": currentMedia};

xhr.open('PUT', apiEndpoint + options.problem_id);
xhr.send(data);

Titanium file upload Rails backend

# Rails backend
def update
  @problem = Problem.find(params[:id])
  @problem.photo = params[:photo]
  @problem.save
end