loop in nested loop inside json response swift

Question

I have this JSON respone:

{
    "success": false,
    "message": {
       "gender": [
           "The gender field is required."
       ],
       "sms_token": [
           "The sms token field is required."
       ]
   }
}

note that the message object could have more than two elements...

and I'm trying to get the array inside message object... I have tried this:

guard let messages = receivedTodo["message"] as? String, let message = receivedTodo["sms_token"] as? String else {
                    print("Could not get messages from JSON")
                    return
                }
                print("The error is:" + message)
            }

but this didn't work and i will always get "could not get messages from JSON"...

I want to loop and get all of the elements inside message object and print them out.. how to archive this?

Salman Ghumsani · Accepted Answer · 2018-04-11 07:00:57Z

4

guard let messages = receivedTodo["message"] as? [String:Any],let tokens = messages["sms_token"] as? [String], let genders = messages["gender"] as? [String] else {  
    return
} 
for token in tokens {
      print(token)
}
for gender in genders {
      print(gender)
}

edited Apr 11, 2018 at 7:00

answered Apr 11, 2018 at 6:43

Salman Ghumsani

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10 Comments

Nitish Over a year ago

He clearly said that wrong. From the structure it is clear that it is a dictionary.

Salman Ghumsani Over a year ago

He said: note that the message object could have more than two elements...

Nitish Over a year ago

Yes, as in key values, not an array.

Nitish Over a year ago

Why are you keeping Any as the value ? In the current JSON, both values are String.

Salman Ghumsani Over a year ago

Can you see message doesn't have the string value ??

|

vadian · Accepted Answer · 2018-04-11 07:07:05Z

2

Please read the JSON, it's pretty easy, there are only two different collection types, array ([]) and dictionary ({}).

The value for key message is a dictionary.

The value for key sms_token is an array of String.

guard let messages = receivedTodo["message"] as? [String:Any], 
      let message = messages["sms_token"] as? [String],
      !message.isEmpty else {
            print("Could not get messages from JSON")
            return
        }
        print("The error is:" + message.joined(separator:", "))
    }

or even

...
guard let messages = receivedTodo["message"] as? [String:[String]],
    let message = messages["sms_token"], !message.isEmpty else { ...

To get all error messages – regardless of the dictionary keys – write

guard let messages = receivedTodo["message"] as? [String:[String]] else {
        print("Could not get messages from JSON")
        return
}
for (key, value) in messages {
    print("The \(key) error is: " + value.joined(separator:", "))
}

edited Apr 11, 2018 at 7:07

answered Apr 11, 2018 at 6:50

vadian

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3 Comments

Lama Over a year ago

Now its working, but how about the other messages? it could have another error messages for example name, gender,... how to add them all?

vadian Over a year ago

I updated the answer to print all error messages regardless of the dictionary keys.

Lama Over a year ago

It's working perfectly now! Thank you so much for the help!

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