How to send a photo as parameter

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• Visualizing MySQL data using D3js and JSON format in Django

  This is my first post here so please ignore any naive errors please.

  I have successfully retrieved my data from database in JSON format. The database has several fields of which I require only timestamp and value. Now, I tried using .values("timestamp", "readings") but on serialization it popped an error as - no attribute _meta. Had to resort to .only("timestamp", "readings") but it returned all the attributes.

  Can you please tell me how to go about filtering the attributes and also visualizing it using D3js or any other library.

  Some relevant details - Model -

  **class Readings(models.Model):
      meter_id = models.CharField(max_length=100)
      timestamp = models.DateTimeField(default=datetime.now)
      readings = models.DecimalField(max_digits=20, decimal_places= 10, default=Decimal('0.0000'))**
  

  The result returned is of the form -

  [{"model": "log.readings", "pk": 4093, "fields": {"meter_id": "c30d4d9a-48b7-56fa-b714-c36247ee7aa8", "timestamp": "2017-04-01T00:00:00Z", "readings": "0E-10"}}

  From this I only need the timestamp and readings field

  Views.py -

  def current(request):
      user = Details.objects.filter(user_id=request.user.id)
      data = Readings.objects.filter(meter_id=user[0].meter_id).only('timestamp', 'readings')
      temp = serializers.serialize('json', data)
      return render_to_response("current.html", {'for_graph': temp})
  
• How to handle specific json error

  When I try to create a json string out of an array I get the following error: "Error = 5 Malformed UTF-8 characters, possibly incorrectly encoded" Though my table contains only strings with utf8_unicode_ci attributes or integers. Also, when I var_dump the array there is nothing to complain about.

  Also I tried mysqli_set_charset("utf8",$con); right after I created my connection. It did not help though.

  How should I fix this error?
• Unable to fetch the data from server using JSON

  Data is coming in JSONObject jsonObj and in JSONArray referalCode1. But when I am creating an object for fetching data from my JSONArray the object is always giving value "null".The problem is with JSONObject c. Because of this, my string referweb is giving null value.

  JSONObject jsonObj = new JSONObject(response);
  
  JSONArray referalCode1 = jsonObj.getJSONArray("group");
  
  for (int i=0;i<4;i++)
  
  {
      JSONObject c = referalCode1.getJSONObject(i);
  
      String referWeb = c.getString("referal_code");
  }
  
• I have been making conformation email for car boooking

  I have been making conformation email for car booking i have code and i am trying to do on localhost not live server i am not getting errors but not reciving an emails too.Any help i have been using xampp and tried emailrelay-setup and test-mail-server-tool didn work

  <?php
  $conn='';
  if ((isset($_POST["MM_insert"])) && ($_POST["MM_insert"] == "form6")) {
  $email=$_POST['email'];
  $first_name=$_POST['first_name'];
  $Last_name=$_POST['Last_name'];
  $City=$_POST['City'];
  $Phone=$_POST['Phone'];
  
  
  $formcontent="
  first_name:  Your name is  $first_name \n
  Prezime: Your last name is $Last_name \n
  Grad:  You live u  $City \n
  Phone:  Your is  $Phone \n
  email:  Your email address is  $email\n
  $Reservation  your reservation has been completed successfully.$num 
  
  
  
  email: $email" ;
  $recipient =$email=$_POST['email'];
  $subject = "Contact Form";
  $mailheader = "From: $email \r\n";
  mail($recipient, $subject, $formcontent, $mailheader) or die("Error!");
  echo "";
  
   } 
  ?>  
  
• Can A Form Method Be Post And Get?

  I am learning PHP and have a situation where I want the method to be POST to pass variables to my php and

  1) Connect to Server
  2) store results in a variable
  3) Display an HTML Table

  However, I later on in my syntax want to use GET to "recall" that variable and output the results to a CSV file. This is what I have, but when I click the button Generate nothing happens. Is this possible? If not, how should I re-write the syntax to make ithappen?

  <body>
      <form method="POST">
          End Date:<input type="date" name="end" value="<?= $_POST['end'] ?>">
          <input type="submit" name="submit" value="Go">
      </form>
  </body>
  <?php
     if (isset($_POST['submit'])) 
     {
         //Connect To Server
         //Store Result Set in Variable
         //Display HTML Table
     }
  ?>
  
  <form method="get">
      <button type="submit" name="csv" value="1">Generate CSV</button>
  </form>
  
• Php post file upload not working

  I am trying to create a mini-chat page.I am tryig to submit a form with some text and a file to go through another php page than where the form is at. The text inputs work but the FILES[] become blank. I tried testing what the error could be but my attempts were unsuccessful. Any help would be very much appreciated. The HTML:

  <div class="inp">
  <form id="dacform" name="chatf" method="post" enctype="multipart/form-data">
  <div class="datpad">
  
  <label id="txtcht"><h2>Title</h2></label>
  <input onfocus="inputchf(this)" onblur="inputchb(this)" type="text" 
  name="chat_title" />
  
  
  <label><h2>Description </h2><p  style="display:inline-block;">(Max 140 
  characters)</p></label>
  <!--<input onfocus="inputchf(this)" onblur="inputchb(this)" type="text" 
  name="chat_title" />-->
  <!--<input type="textarea" name="chat_desc"/>-->
  <textarea name="chat_desc" onfocus="textfoc(this)" onblur="textblur(this)">
  </textarea>
  
  
  <label><h2>Background Image</h2></label>
  <input type="file" id="upload" class="custom-file-input" name="chat_back">
  
  <!--<input type="submit" name="subm_chat" class="btn-style" value="Create 
  Chat">-->
  <div class="btn-style">Create Chat</div>
  </form>
  </div>
  </div>
  </div>
  

  The Javascript:

  if($.post('chatcre.php', $('#dacform').serialize())){alert("sent");}
  

  The chatcre.php file:

  <?php
  
  
  session_start();
  include 'dbconnect.php';
  
  $username = $_SESSION['username'];
  
  //start chat
  function slugify($text)
  {
  $text = str_replace(' ', '_', $text);
  $text = trim($text, '_');
  
  
  if (empty($text)) {
  return 'n-a';
  }
  
  return $text;
  }
  
  if(isset($_POST['chat_title']) ? $_POST['chat_title'] : null){
  $chat_title = $_POST['chat_title'];
  $chat_titleEnc = md5($chat_title);
  $chat_desc = $_POST['chat_desc'];
  $chat_date = date("Y/m/d h:i:sa");
  
  $chat_index = $chat_title.$username.$chat_date;
  $chat_index = md5($chat_index);
  $chat_index = $chat_index.".html";
  
  
  
  $errors= array();
        $file_name = $_FILES['chat_back']['name'];
        $file_size = $_FILES['chat_back']['size'];    
        $file_tmp = $_FILES['chat_back']['tmp_name'];
        $file_type = $_FILES['chat_back']['type'];
        $file_ext= explode('.',$_FILES['chat_back']['name']);
        $file_ext = end($file_ext);
        $file_ext= strtolower($file_ext);
        $expensions= array("jpeg","jpg","png");
  
        if(in_array($file_ext,$expensions)=== false){
           $errors[]="extension not allowed, please choose a JPEG or PNG file.";
        }
        if(in_array($file_ext,$expensions) == ".jpg"){
        $file_name = "1";
        $file_name .=$username;
        $file_name .= $chat_titleEnc;
        $file_name=$file_name.time().".jpg";
        $file_name = slugify($file_name);
  }else if(in_array($file_ext,$expensions) == "jpeg"){
        $file_name = "1";
        $file_name .=$username;
   $file_name .= $chat_titleEnc;
        $file_name=$file_name.time().".jpeg";
        $file_name = slugify($file_name);
  }else{
         $file_name = "1";
        $file_name .=$username;
   $file_name .= $chat_titleEnc;
        $file_name=$file_name.time().".png";
        $file_name = slugify($file_name);
   }
        if($file_size > 2097152) {
           $errors[]='File size must be less than 2 MB';
        }
  
  
        if(empty($errors)==true) {
  
      if(move_uploaded_file($file_tmp,"cimages/".$file_name)){
  $chat_img = "cimages/".$file_name;
  $sql_chat = "INSERT INTO  `id1251041_udata`.`chats` (
  `id` ,
  `chat_title` ,
  `chat_desc` ,
  `chat_img` ,
  `chat_wall`,
  `chat_date` ,
  `chat_authr`,
  `chat_index`
  )
  VALUES (
  NULL ,  '$chat_title',  '$chat_desc',  '$chat_img',  'None' , '$chat_date','$username','$chat_index'
  )";
  
  $chat_create = mysqli_query($conn,$sql_chat);
  if($chat_create){echo "si"." ".$chat_date;}else{echo "nien".mysqli_error($chat_create);}
  
  }//file upload yes
  
  }
  //end img
  
  
  }
  //end ifset chat
  
• Swift 3: Consistent player movement along Joystick || Spritekit

  My question is how can i incorporate my sprite to have a continuous movement along with the joystick? I want the player to be moving at a certain speed the whole time, and then whenever the user moves the joystick a certain angle then the player will just follow along with it.

  ex: Sprite automatically moves a certain speed, ex; speed = CGFloat(100), then it will continue at this speed, by speed the sprite just automatically is moving in a direction, I don't have any idea on how to implement it so that my player is moving at a constant rate, and how to change the direction is moves with the joysticks.

  Currently with my code i'm able to rotate the sprite.

  I appreciate all the help you guys give, thank you in advance.

  override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
  
  
      for touch in touches {
          touchLocation = touch.location(in: self)
  
          if (ball.frame.contains(touchLocation)) {
  
              stickActive = true
  
          } else {
              stickActive = false
          }
      }
  
  
  
  }
  
  override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
      for touch in touches {
          touchLocation = touch.location(in: self)
  
          if isAlive == true{ 
              joyStickMoved()
  
          }
          if isAlive == false{
              player.position.x = -300
          }
  
      }
  }
  override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
          if (stickActive == true) {
              let move: SKAction = SKAction.move(to: base.position, duration: 0.2)
              move.timingMode = .easeOut
              ball.run(move)
      }
  }
  
  func joyStickMoved() {
  
      if (stickActive == true) {
  
  
  
          let v = CGVector(dx: touchLocation.x - base.position.x, dy: touchLocation.y - base.position.y)
          let angle = atan2(v.dy, v.dx)
  
          // let degree = angle * CGFloat( 180 / Double.pi)
  
          let length: CGFloat = base.frame.size.height / 2
  
          let xDist: CGFloat = sin(angle - 1.57079633) * length
          let yDist: CGFloat = cos(angle - 1.57079633) * length
          //   TODO   // xJoystick = touchLocation.x - base.position.x
          // yJoystick = touchLocation.y - base.position.y
  
          if (base.frame.contains(touchLocation)) {
              ball.position = touchLocation
  
          } else {
              ball.position = CGPoint(x: base.position.x - xDist, y: base.position.y + yDist)
  
          }
  
          player.zRotation = angle - 1.57079633
  
      }
  
  
  }
  
  override func update(_ currentTime: TimeInterval) {
  
  
  
      if isAlive == false && stickActive == false {
          lblMain.text = "Game Over"
          player.position.x = -300
          waitThenResetTheGame()
      }
  
      if stickActive == true {
          moveNodeToLocation()
      }
  }
  
• Sort Realm Objects Alphabetically in Swift 3

  i have a PhoneBook that want to Sort Realm Objects ( Contacts ) Alphabetically , i followed some Tutorials , but i have Some Problems that Showed in Picture :

  

  and my Codes are :

  MainVC.swift :

  import UIKit
  import RealmSwift
  
  class MainVC: UIViewController,UITableViewDelegate,UITableViewDataSource {
  
  @IBOutlet weak var contact_tableview: UITableView!
  
  var contactsWithSections = [[ContactItem]]()
  
  var sectionTitles = [String]()
  
  let realm = try! Realm()
  
  var ContactList: Results<ContactItem> {
      get {
          return realm.objects(ContactItem.self)
      }
  }
  
  override func viewDidLoad() {
      super.viewDidLoad()
      self.navigationController?.navigationBar.titleTextAttributes =
          [NSFontAttributeName: UIFont(name: "IRANSansWeb-Medium", size: 17)!]
      contact_tableview.delegate = self
      contact_tableview.dataSource = self
  
      let (arrayContacts, arrayTitles) = collation.partitionObjects(array: ContactList, collationStringSelector: #selector(getter: ContactItem.first_name))
  
  }
  
  
  
  
  
  func numberOfSections(in tableView: UITableView) -> Int {
  
      return 1
  
  }
  func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
  
  
  
      return ContactList.count
  
  }
  
  func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
  
  
      let cell = tableView.dequeueReusableCell(withIdentifier: "ContactCell") as! ContactCell
  
      let item = ContactList[indexPath.row]
  
      cell.lblName!.text = item.first_name
  
      return cell
  
  }
  
  func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
  
      let ContactV = storyboard?.instantiateViewController(withIdentifier: "ViewContact") as! ContactInfoVC
      navigationController?.pushViewController(ContactV, animated: true)
      ContactV.ContactID = ContactList[indexPath.row]
  }
  
  override func viewWillAppear(_ animated: Bool) {
      super.viewWillAppear(animated)
      contact_tableview.reloadData()
      // to reload selected cell
  }
  
  
  
  
  
  }
  
  
  
  let collation = UILocalizedIndexedCollation.current()
  
  extension UILocalizedIndexedCollation {
      //func for partition array in sections
      func partitionObjects(array:[AnyObject], collationStringSelector:Selector) -> ([AnyObject], [String]) {
          var unsortedSections = [[AnyObject]]()
          //1. Create a array to hold the data for each section
          for _ in self.sectionTitles {
              unsortedSections.append([]) //appending an empty array
          }
          //2. Put each objects into a section
          for item in array {
              let index:Int = self.section(for: item, collationStringSelector:collationStringSelector)
              unsortedSections[index].append(item)
          }
          //3. sorting the array of each sections
          var sectionTitles = [String]()
          var sections = [AnyObject]()
          for index in 0 ..< unsortedSections.count { if unsortedSections[index].count > 0 {
              sectionTitles.append(self.sectionTitles[index])
              sections.append(self.sortedArray(from: unsortedSections[index], collationStringSelector: collationStringSelector) as AnyObject)
              }
          }
          return (sections, sectionTitles)
      }
  }
  

  Contact.swift :

      import UIKit
  import RealmSwift
  
  
  
  class ContactItem : Object {
  
      dynamic var id:Int = 0
      dynamic var first_name = ""
      dynamic var last_name = ""
      dynamic var work_email = ""
      dynamic var personal_email = ""
      dynamic var contact_picture = ""
      dynamic var mobile_number = ""
      dynamic var home_number = ""
      dynamic var isFavorite = false
      dynamic var Notes = ""
  
  }
  

  and how i sort them of Last Contact Added to First ? Like Contact Tab in Phone Application in iPhone ...

  Regards <3
• Add Tap Recognizer to UIImage inside UITextView

  I have an UITextView which has a NSAttributedString which has some UIImages attached as NSAttachment

  The image(s) are attached as the following code:

  let att = NSTextAttachment()
  att.image = image
  let attrString = NSAttributedString(attachment: att)
  
  // Adding some line breaks before and after inserting the UIImage
  let mutable = NSMutableAttributedString(attributedString: NSAttributedString(string: "\n\n"))
  mutable.append(attrString)
  mutable.append(NSAttributedString(string: "\n\n"))
  
  // Get the desired location and inserts the image
  let location = self.inputTextView.selectedRange.location 
  self.inputTextView.textStorage.insert(mutable, at: location)
  

  Everything works perfectly, but now I'm trying to add a gesture recognizer to the inserted image, so I can prompt the user with some options, and here's where I'm having trouble.

  If the inserted image was a regular UIImageView I'd do it easily, but how can I add a gesture recognizer to the UIImage attached?

  UIImage doesn't have a addGestureRecognizer property as the UIImageView has; doesn't have a addTarget option to detect the touchUpInside.

  What's the best approach on this or there is something I'm missing ?

  Thanks :)
• How to parse the data from the JSON string in Swift 3

  I am getting the JSON response in this format The below is fetched from the response:

      {
          "messages": null,
          "data": [
              {
                  "id": 1,
                  "name": "Mirq",
                  "address": "Shop 8",
                  "phoneNumber": "",
                  "latitude": 29.370436225979461,
                  "longitude": 47.977884503337087,
                  "cashPointOperatingDays": [
                      {
                          "startTimeAm": "07:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "22:00",
                          "operatingDay": "Sun"
                      },
                      {
                          "startTimeAm": "07:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "22:00",
                          "operatingDay": "Mon"
                      },
                      {
                          "startTimeAm": "07:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "22:00",
                          "operatingDay": "Tue"
                      },
                      {
                          "startTimeAm": "07:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "22:00",
                          "operatingDay": "Wed"
                      },
                      {
                          "startTimeAm": "07:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "22:00",
                          "operatingDay": "Thu"
                      },
                      {
                          "startTimeAm": "07:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "22:00",
                          "operatingDay": "Fri"
                      },
                      {
                          "startTimeAm": "07:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "22:00",
                          "operatingDay": "Sat"
                      }
                  ]
              },
              {
                  "id": 2,
                  "name": "Mali",
                  "address": "Shop 18",
                  "phoneNumber": "",
                  "latitude": 29.362988769826469,
                  "longitude": 47.964750586760957,
                  "cashPointOperatingDays": [
                      {
                          "startTimeAm": "07:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "22:00",
                          "operatingDay": "Sun"
                      },
                      {
                          "startTimeAm": "07:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "22:00",
                          "operatingDay": "Mon"
                      },
                      {
                          "startTimeAm": "07:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "22:00",
                          "operatingDay": "Tue"
                      },
                      {
                          "startTimeAm": "07:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "22:00",
                          "operatingDay": "Wed"
                      },
                      {
                          "startTimeAm": "07:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "22:00",
                          "operatingDay": "Fri"
                      },
                      {
                          "startTimeAm": "07:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "22:00",
                          "operatingDay": "Sat"
                      },
                      {
                          "startTimeAm": "07:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "22:00",
                          "operatingDay": "Thu"
                      }
                  ]
              },
              {
                  "id": 3,
                  "name": "Mali",
                  "address": "Shop 10",
                  "phoneNumber": "",
                  "latitude": 29.36271060852382,
                  "longitude": 47.964779503398283,
                  "cashPointOperatingDays": [
                      {
                          "startTimeAm": "10:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "18:00",
                          "operatingDay": "Sun"
                      },
                      {
                          "startTimeAm": "10:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "18:00",
                          "operatingDay": "Mon"
                      },
                      {
                          "startTimeAm": "10:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "18:00",
                          "operatingDay": "Tue"
                      },
                      {
                          "startTimeAm": "10:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "18:00",
                          "operatingDay": "Wed"
                      },
                      {
                          "startTimeAm": "10:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "18:00",
                          "operatingDay": "Thu"
                      },
                      {
                          "startTimeAm": "10:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "18:00",
                          "operatingDay": "Fri"
                      },
                      {
                          "startTimeAm": "10:00",
                          "endTimeAm": "",
                          "startTimePm": "",
                          "endTimePm": "18:00",
                          "operatingDay": "Sat"
                      }
                  ]
               ],
      "status": 0
  }
  

  How to parse the value "operatingDay" for each address in swift3?

  The Alamofire code which i am using is

  :

      func getShopsApiCall(URL: URL) {
          Alamofire.request(URL, method: .get, parameters: nil, encoding: JSONEncoding.default, headers: nil)
              .responseObject { (response: DataResponse<GetTravelShopsResponse>) in
                  print(response.result.value!)
                  switch response.result {
                  case .success:
                      if !(response is NSNull) {
                          // optional is NOT NULL, neither NIL nor NSNull
                          guard let end = response.result.value else {
                              return
                          }
                          DispatchQueue.main.async {
                              //end = nullToNil(end.loginAuthenticationInfo?.accessToken)
                              self.yourArray = end.travelShopsData!
                              var dataArray = [Any]()
                              print(self.yourArray)
                              if let threeDayForecast = end.travelShopsData {
                                  for forecast in threeDayForecast {
                                      self.nameArray.append(forecast.name as Any)
                                      self.addressArray.append(forecast.address as Any)
                                      dataArray.append(forecast.cashPointOperatingDays as Any)
                                      print(forecast.name as Any)
                                      print(forecast.address as Any)
                                      print(forecast.phoneNumber as Any)
                                      print(forecast.latitude as Any)
                                      print(forecast.longitude as Any)
                                      print(forecast.cashPointOperatingDays as Any)
                                      print("count \(dataArray.count)")
                                      print("Element \(dataArray[0])")
                                      for i in 0..<dataArray.count {
                                         // self.cashPointOperatingDaysArray.append(dataArray[i]["operatingDay"] as? Any)
                                          print("RESULT TEST \(dataArray)")
                                      }
                                                                  }
                              }
  
  //                            if let cashCollectionsDateTime = end.cashCollectionsDateTimeData {
  //                                for operationDetails in cashCollectionsDateTime {
  //                                    self.cashPointOperatingDaysArray.append(operationDetails.day as Any)
  //                                    
  //                                }
  //                            }
  
                              self.travelShopsTableView.reloadData()
                          }
                      } else {
                          // null
                      }
                      break
                  case .failure:
                      if let error = response.result.error as? URLError {
                          print("URLError occurred: \(error)")
                      } else {
                          print("Unknown error: \(String(describing: response.result.error))")
                      }
                      break
                  }
          }
      }
  

  The mapping class which i use is:

      // MARK: Travel Shops Mapper
  class GetTravelShopsResponse: Mappable {
      var message: String?
      var status: Int?
      var travelShopsData: [TravelShopsResponse]?
      var cashCollectionsDateTimeData: [CashCollectionsDateTime]?
      // var threeDayForecast: [TravelShopsResponse]?
      required init?(map: Map) {
          mapping(map: map)
      }
      func mapping(map: Map) {
          message    <- map["messages"]
          status    <- map["status"]
          travelShopsData <- map["data"]
      }
  }
  
  class TravelShopsResponse: Mappable {
      var messages: String?
      var name: String?
      var address: String?
      var phoneNumber: String?
      var latitude: Float?
      var longitude: Float?
      var cashPointOperatingDays: [Any]?
      var locationid: String?
      required init?(map: Map) {
          mapping(map: map)
      }
      // Mappable
      func mapping(map: Map) {
          name  <- map["name"]
          address    <- map["address"]
          phoneNumber <- map["phoneNumber"]
          latitude       <- map["latitude"]
          longitude       <- map["longitude"]
          cashPointOperatingDays       <- map["cashPointOperatingDays"]
          locationid       <- map["id"]
      }
  }
  
  class CashCollectionsDateTime: Mappable {
      var day: String?
  
      required init?(map: Map){
          mapping(map: map)
      }
  
      func mapping(map: Map) {
          day <- map["operatingDay"]
  
      }
  }
  
• How do I cache a file download request using Alamofire?

  I have been trying to achieve caching of a file that I download from an url. File is about 5 MB in size. Below is the header that I obtain from that file url:

  Content-Type : application/x-zip-compressed
  Content-Length : 4088083
  Expires : Sun, 24 Jun 2018 20:10:51 GMT
  Etag : "1e2ec46bcg24f13"
  X-Powered-By : ASP.NET
  Last-Modified : Thu, 22 Jun 2017 11:21:48 GMT
  Accept-Ranges : bytes
  Server : Microsoft-IIS/8.0
  Date : Sat, 24 Jun 2017 20:10:48 GMT
  Cache-Control : public,max-age=31536000
  

  I am using following way to create download request:

  var request = URLRequest(url: URL(string: downloadUrl)!, cachePolicy: URLRequest.CachePolicy.returnCacheDataElseLoad, timeoutInterval: 120)
  request.addValue("public", forHTTPHeaderField: "Cache-Control")
  

  File downloads successfully but, it isn't cached. When I go offline and try to download, I get 'The Internet connection appears to be offline.' error.

  I tried changing URLCache like below from AppDelegate didFinishLaunch

  let urlCache = URLCache(memoryCapacity: 4 * 1024 * 1024, diskCapacity: 20 * 1024 * 1024, diskPath: nil)
  URLCache.shared = urlCache
  

  But no luck. Thanks in advance.
• How can I only require authentication once with Alamofire?

  I would like users of my app to be able to log in once, establish some kind of session, then be able to make requests to the backend without further authentication.

  Right now I'm having the user "login" on the frontend by entering their username and password into a UI which stores them in global variables and sends them with each request to authenticate individually. I have two problems with this:

  1. This feels like a hack, it doesn't seem clean.
  2. I'm not sure how secure this is.

  I've searched through tutorials, articles, and the Alamofire README, but can't seem to find anything on this. How can I only require authentication once with Alamofire on iOS?
• Take Pictures with custom numbering

  I am making a school management system, which allows students to be registered on the system along side with their photo. Every one know the pain of uploading single photo of 500 students.. So I wonder if I first register all the students and then I give every student an unique ID, after then I Take photos according to their ID

  EXAMPLE A student with an ID of 001, he will be the first to be captured, and that program will rename first photo with STD001,

  A student with an ID of 002, will be the second to be captured, and that program will rename second photo with STD002,

  A student with an ID of 003, will be the third to be captured, and that program will rename second photo with STD003,

  A student with an ID of 300, will be the 300th to be captured, and that program will rename the second photo with STD300,

  So i can upload all photos at once and the system will know where to upload to each student
• Why are my horizontal photos scaling with screen size but my vertical photos are not?

  I am working on a site that has both vertical and horizontal photos that are on an overflow:scroll. On a desktop screen the photos look great and line up, However, when the screen size decreases (tablet or mobile) my landscape pictures scale great, my portrait photos stay the same size! Why?!

  Edit: All photos are 300ppi

       @media only screen and (max-device-width: 540px) {
       h1 {width: 100%;}
       }
  
       @media screen and (max-height: 450px) {
       .sidenav {padding-top: 15px;}
       .sidenav a {font-size: 18px;}
       }
  
  
  
      .parent-container {
              width: 95%;
  
              height: auto;
  			      padding: auto;
              overflow: scroll;
              overflow-y: hidden;
              margin-top: 5px;
              white-space: nowrap;
              display: inline-block;
  
      }
  
      .container {
      position: relative;
      display: inline-block;
      padding-right: 15px;
      padding-left: 15px;
  
      }
  
      .image {
      opacity: 1;
      display: inline-block;
      width: 100%;
      height: auto;
      transition: .5s ease;
      backface-visibility: hidden;
      padding-right: 15px;
      object-fit: cover;
  
      }
  
  
      .parent-container .container .image {
      width: auto\9; /* IE8 */
      }

      <div class="parent-container">
      <div class="container">
      <img src="http://via.placeholder.com/750x500" alt="" class="image" 
      style="width:100%">
      </div>
  
      <div class="container">
      <img src="http://via.placeholder.com/323x485" alt="" class="image" 
      style="width:100%">
      </div>
  
      <div class="container">
      <img src="http://via.placeholder.com/323x485" alt="" class="image" 
      style="width:100%">
      </div>
   
  
       <div class="container">
       <img src="http://via.placeholder.com/323x485" alt="" class="image" 
       style="width:100%">
       </div>
  
       <div class="container">
       <img src="http://via.placeholder.com/750x500" alt="" class="image" 
       style="width:100%">
       </div>
  
       <div class="container">
       <img src="http://via.placeholder.com/323x485" alt="" class="image" 
       style="width:100%">
       </div>
  
       <div class="container">
       <img src="http://via.placeholder.com/750x500" alt="" class="image" 
       style="width:100%">
       </div>
  
       <div class="container">
       <img src="http://via.placeholder.com/750x500" alt="" class="image" 
       style="width:100%">
       </div>
  
  
       <div class="container">
       <img src="http://via.placeholder.com/323x485" alt="" class="image" 
       style="width:100%">
       </div>
  
       <div class="container">
       <img src="http://via.placeholder.com/323x485" alt="" class="image" 
       style="width:100%">
       </div>
  
       <div class="container">
      <img src="http://via.placeholder.com/750x500" alt="" class="image" 
      style="width:100%">
      </div>
  
  
      <div class="container">
      <img src="http://via.placeholder.com/323x485" alt="" class="image" 
      style="width:100%">
      </div>
  
      <div class="container">
      <img src="http://via.placeholder.com/323x485" alt="" class="image" 
      style="width:100%">
      </div>
  
  
      </div>