Append Json Data To Array - Firebase/Swift

Question

I am trying to append data from Firebase to a variable called var itemNumbers: [[String: AnyObject]]! that belongs to an NSObject. This is how the fetch looks like:

        let orderItems = snapDict["itemNumbers"] as! [String:String]
        self.NSOBJECT.itemNumbers.append(orderItems as [String : AnyObject]) 
        print(orderItems)

When I do this the app breaks exactly where I try to append orderItems to the array. This is my error:

fatal error: unexpectedly found nil while unwrapping an Optional value

JSON:

{ "order": {
      "itemNumbers" : {
         "1": "Item Description",
         "2": "Item Description"
                      }
           }   
}

Do I need to convert orderItems into something else before I try to append it?

Thanks for the help!

try this . self.NSOBJECT.itemNumbers.append(orderItems as [String : String]) — Nazmul Hasan
– Nazmul Hasan, Commented Nov 8, 2016 at 6:27
Maybe changing the var itemNumbers: [[String: AnyObject]]! to var itemNumbers: [[String: String]]! ??? — cosmos
– cosmos, Commented Nov 8, 2016 at 6:28

LC 웃 · Accepted Answer · 2016-11-08 07:11:50Z

1

Correct your json as whole lot of fields are incorrect.

Make your variable itemNumbers from

var itemNumbers: [[String:AnyObject]]!

to

 var itemNumbers: [[String:AnyObject]] = [] //if nil instantiate

as itemsNumbers is optional.

And append as

 let order = jsonDictionary["order"] as! [String:AnyObject]
 let tempItemNumbers = order["itemNumbers"] as! [String:AnyObject]
 self.NSOBJECT.itemNumbers.append(tempItemNumbers)
 print( self.NSOBJECT.itemNumbers)

edited Nov 8, 2016 at 7:11

answered Nov 8, 2016 at 7:01

LC 웃

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4 Comments

cosmos Over a year ago

could not cast value of nsdictionary to nsarray. Also, I am accessing cart through the database reference so I do not need to use it to access tempItemNumbers right?

cosmos Over a year ago

now the problem is how should I send it to firebase? let cartVal = ["item":"1"]["item2":"2"] like that???

cosmos Over a year ago

I am not sure how to create this when I set the value on the database reference. Never done this , any clues? This will help me greatly.

LC 웃 Over a year ago

@cosmos Your can make your hierarchy as

{   "order": {     "itemNumbers": {       {         "1": "Item Description"       },       {         "2": "Item Description"       }     }   } }

..For reference how to strucuture see here or here

Nazmul Hasan · Accepted Answer · 2016-11-08 07:19:33Z

1

mention comment

well if you want to append order then use [[String: AnyObject]] on the other hand append itemNumbers for [String:String]

      guard  let  itemNumbers= snapDict["itemNumbers"] as? [String:String]  else{
         return
     }

      self.NSOBJECT.itemNumbers.append(itemNumbers)

or

      guard  let  orderItems = snapDict["order"] as? [[String: AnyObject]]  else{
         return
     }

      self.NSOBJECT.itemNumbers.append(orderItems)

Note : avoid the problematic implicit conversion [[String: AnyObject]]!

edited Nov 8, 2016 at 7:19

answered Nov 8, 2016 at 6:20

Nazmul Hasan

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3 Comments

cosmos Over a year ago

I added ` self.NSOBJECT.itemNumbers.append(orderItems! as [String : AnyObject])` and this was the output: [["item": 1]]

cosmos Over a year ago

Is this how I should send the data to Firbase? let ordertems = ["item":"1"]["item2":"2"] in order to receive it like your example? I assign this to the key orderItems.

cosmos Over a year ago

(ill keep working on this tomorrow) thanks for the help.

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