Pradip Kumar Pradip Kumar - 4 months ago 22
JSON Question

How to create the model class for the following JSON data and parse it?

My JSON data

{
"addon_items" : [
{
"aname" : "",
"id" : "2588",
"name" : "Plain Nan",
"order" : "1",
"aid" : "259",
"Sub_Add_Items" : "",
"icon" : "",
"status" : "1",
"next" : "0",
"price" : "0.60"
},
{
"aname" : "",
"id" : "2589",
"name" : "Pitta Bread",
"order" : "2",
"aid" : "259",
"Sub_Add_Items" : "",
"icon" : "",
"status" : "1",
"next" : "0",
"price" : "0.00"
}

],

"addon" : {
"description" : "Please choose your Nan bread",
"aname" : "",
"id" : "259",
"icon" : "",
"limit" : "1",
"special_addon" : "",
"next" : "165"
}
}


I created three class models named AddOnResponse, AddOn, AddOnItems like this:

AddOnResponse class model

class AddOnResponse {

var addon: Array<String>?
var addonitems: Array<AnyObject>?

init(addon:Array<String>?,addonitems: Array<AnyObject>?){
self.addon = addon
self.addonitems = addonitems
}
}


AddOn class model

class AddOn {


var id: Int?
var icon: String?
var desc: String?
var limit: Int?
var next: Int?
var aname: String?
var specialaddon: Int?

init(id: Int?,icon: String?,desc: String?,limit: Int?,next: Int?,aname: String?,specialaddon: Int?){

self.id = id
self.icon = icon
self.desc = desc
self.limit = limit
self.next = next
self.aname = aname
self.specialaddon = specialaddon

}
}


AddOnItems class model

class AddOnItems {


var id: Int?
var aid: Int?
var name: String?
var price: Int?
var order: Int?
var status: Int?
var next: Int?
var aname: String?
var subaddItems: Int?
var icon: String?

init(id: Int?,aid: Int?,name: String?,price: Int?,order: Int?,status: Int?,next: Int?,aname: String?,subaddItems: Int?,icon: String?){
self.id = id
self.aid = aid
self.name = name
self.price = price
self.order = order
self.status = status
self.next = next
self.aname = aname
self.subaddItems = subaddItems
self.icon = icon
}
}


Now I am fetching my JSON data using Alamofire but when accepting dat into class model using object I am getting nil value.

var addonResponses = [AddOnResponse]()

Alamofire.request(.GET, myAddOnUrl)
.validate()
.responseJSON
{ response in
switch response.result
{
case .Success:
if let value = response.result.value{
let json = JSON(value)
print(json)
print(json["addon"].arrayValue)


for(_,content) in json{
let addOnRes = AddOnResponse(addon:content["addon"].arrayValue,
addonitems:content["addon_items"].Arrayobject)

print(self.addonResponses.count)
print(addOnRes.addon)
print(addOnRes.addonitems)
}
}


The addon and addonitems data are coming nil, why?

Answer

After going through your JSON response, what I see is that you are getting an object which has two nodes(or properties). First- "addon_items" which has as array and for which you have created a class AddOnItems which is correct. Second- "addon": this key over here is reference to a 'Dictionary' rather than to an array.

So to store the response in your AddOnResponse object, try the following code.

Alamofire.request(.GET, myAddOnUrl).validate().reponseJSON { response in
    switch resonse.result {
    case .Success:
       if let value = response.result.value {
           let json = JSON(value)
           let responseDictionary = json.dictionaryValue as? [String: AnyObject]
           let addOnRes = AddOnResponse(addon:responseDictionary["addon"].dictionaryValue, addonitems:responseDictionary["addon_items"].arrayValue)
       }
    case .Failure:
       break
    } 
}

Also make change to your AddOnResponse class

class AddOnResponse {
    var addon: [String: AnyObject]?
    var addonitems: Array<AnyObject>?

    init(addon:[String: AnyObject]?,addonitems: Array<AnyObject>?){
        self.addon = addon
        self.addonitems = addonitems
    }
}

TL;DR Your JSON response doesn't properly correspond to the model you've made in your app. Double check the "addon" key of your json response which has a dictionary object to it and NOT AN ARRAY and accordingly make your model classes.

Edit: Rectifying the mistake to point the casting error. What I would now suggest is that pass the JSON object for `add_on' key. In the AddOn class change the initialiser so that it takes a JSON object. Then initialising them using. AddOn Class Initialiser

init(json: JSON) {
    id = json["id"].intValue
    name = json["name"].stringValue
    // and so on
}

Similarly do the same for AddOnItems. And in the AddOnResponse initialiser iterate in a loop the JSON object for AddOnItems. Initialise it and append to the addOnItems array property. Sorry cannot write the code for it right now. Got a time constraint.

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