Submitting an array of dictionaries using alamofire

Question

I need to send an array of dictionaries via a POST request. For instance:

materials: [[String, String]] = [
  [
    "material_id": 1,
    "qty": 10
  ],
  [
    "material_id": 2,
    "qty": 5
  ]
]

Alamofire.request sends the following data:

materials => array(
  [0] => array("material_id" => 1),
  [1] => array("qty" => 10),
  [2] => array("material_id" => 2),
  [3] => array("qty" => 5),
)

I want to get this view:

materials => array(
  [0] => array(
    "material_id" => 1,
    "qty" => 10
  ),
  [1] => array(
    "material_id" => 2,
    "qty" => 5
  ),
)

Answer 1

The problem was the add method. I encoded in PHP for 5 years and forgot that in Swift indexes are not automatically assigned, as in PHP. So my first listened code:

func getParameters() -> [[String: AnyObject]] {
    var result = [[String: AnyObject]]()

    for mmap in mmaps {
        let material: [String: AnyObject] = [
            "material_id": mmap.material.id,
            "quantity": mmap.qty
        ]
        result.append(material)
    }

    return result
}

The answer rigidly assigns you the keys:

func getParameters() -> [String: [String: AnyObject]] {
    var result = [String: [String: AnyObject]]()

    let mmaps = self.mmaps.allObjects as [Mmap]
    for i in 0..<mmaps.count {
        let mmap = mmaps[i]
        let material: [String: AnyObject] = [
            "material_id": mmap.material.id,
            "quantity": mmap.qty
        ]
        result["\(i)"] = material
    }

    return result
}

Answer 2

A few thoughts:

• It would be easiest if you sent the answer in the form of a dictionary with one key and correctly encoded the array in the dictionary:

  let materials = [ "materials":
      [
          [
              "material_id": 1,
              "qty": 10
          ],
          [
              "material_id": 2,
              "qty": 5
          ]
      ]
  ]
  

  parameters of request(), Alamofire .

• , - JSON. JSON ( JSONSerialization JSONEncoder), .

• application/x-www-form-urlencoded , . Swift 3 :

  func encodeParameters(_ object: Any, prefix: String? = nil) -> String {
      if let dictionary = object as? [String: Any] {
          return dictionary.map { key, value -> String in
              self.encodeParameters(value, prefix: prefix != nil ? "\(prefix!)[\(key)]" : key)
              }.joined(separator: "&")
      } else if let array = object as? [Any] {
          return array.enumerated().map { (index, value) -> String in
              return self.encodeParameters(value, prefix: prefix != nil ? "\(prefix!)[\(index)]" : "\(index)")
          }.joined(separator: "&")
      } else {
          let escapedValue = "\(object)".addingPercentEncoding(withAllowedCharacters: .urlQueryValueAllowed)!
          return prefix != nil ? "\(prefix!)=\(escapedValue)" : "\(escapedValue)"
      }
  }
  

  extension CharacterSet {
  
      /// Returns the character set for characters allowed in the individual parameters within a query URL component.
      ///
      /// The query component of a URL is the component immediately following a question mark (?).
      /// For example, in the URL `http://www.example.com/index.php?key1=value1#jumpLink`, the query
      /// component is `key1=value1`. The individual parameters of that query would be the key `key1`
      /// and its associated value `value1`.
      ///
      /// According to RFC 3986, the set of unreserved characters includes
      ///
      /// `ALPHA / DIGIT / "-" / "." / "_" / "~"`
      ///
      /// In section 3.4 of the RFC, it further recommends adding `/` and `?` to the list of unescaped characters
      /// for the sake of compatibility with some erroneous implementations, so this routine also allows those
      /// to pass unescaped.
  
      static var urlQueryValueAllowed: CharacterSet = {
          let generalDelimitersToEncode = ":#[]@"    // does not include "?" or "/" due to RFC 3986 - Section 3.4
          let subDelimitersToEncode = "!$&'()*+,;="
  
          var allowed = CharacterSet.urlQueryAllowed
          allowed.remove(charactersIn: generalDelimitersToEncode + subDelimitersToEncode)
          return allowed
      }()
  }
  

  , response (, response vs. responseJSON vs....).

  , , :

  materials[0][material_id]=1&materials[0][qty]=10&materials[1][material_id]=2&materials[1][qty]=5
  

  , -, .

, application/x-www-form-urlencoded /, . , , , RFC, . JSON.

Swift . .

Answer 3

JSON , JSON , , lke this:

NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject: yourArry options:NSJSONWritingPrettyPrinted error:&error];
NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];

, ..:)