How to create a JSON from Dictionary with an array - json

Question

I have an object "itensList", it has the fields "name", "createdAt" and an array of "itens".
I want to be able to build JSON that looks like this:
{
"name": "List name"
"CreatedAt": "12:12 12/12/2016"
"itens": [
{
"title": "Item title"
"CreatedAt": "12:13 12/12/2016"
"isDone": false
},
{
"title": "Another item title"
"CreatedAt": "12:14 12/12/2016"
"isDone": true
}
]
}
I have tried a few different approaches with no success.
Item Object
class Item: Object {
dynamic var name = ""
dynamic var createdAt = NSDate()
dynamic var isDone = false
}
Item List Object
class ItemList: Object {
dynamic var name = ""
dynamic var createdAt = NSDate()
let itens = List<Item>()
}

Answer 1

For the example, let's make an object similar to what you must have:
class Iten {
let title:String
let createdAt:String
let isDone:Bool
init(title: String, createdAt: String, isDone: Bool) {
self.title = title
self.createdAt = createdAt
self.isDone = isDone
}
}
The trick I suggest is to add a computed value that will return a dictionary:
class Iten {
let title:String
let createdAt:String
let isDone:Bool
init(title: String, createdAt: String, isDone: Bool) {
self.title = title
self.createdAt = createdAt
self.isDone = isDone
}
var toDictionary: [String:AnyObject] {
return ["title": title, "createdAt": createdAt, "isDone": isDone]
}
}
Let's use it:
let iten1Dict = Iten(title: "title1", createdAt: "date1", isDone: false).toDictionary
let iten2Dict = Iten(title: "title2", createdAt: "date2", isDone: true).toDictionary
We now make the encapsulating dictionary:
let dict: [String:AnyObject] = ["name": "List name", "createdAt": "dateX", "itens": [iten1Dict, iten2Dict]]
To finish, we encode this dictionary to JSON data then we decode it as a String:
do {
let jsonData = try NSJSONSerialization.dataWithJSONObject(dict, options: .PrettyPrinted)
if let jsonString = String(data: jsonData, encoding: NSUTF8StringEncoding) {
print(jsonString)
}
} catch let error as NSError {
print(error)
}
And voilà:
{
"createdAt" : "dateX",
"itens" : [
{
"title" : "title1",
"createdAt" : "date1",
"isDone" : false
},
{
"title" : "title2",
"createdAt" : "date2",
"isDone" : true
}
],
"name" : "List name"
}

Answer 2

Raphael,
This piece of code builds a JSON query. It should get you started, just keep hacking and you'll find a way! That's the fun of programming!
func JSONquery()
let request = NSMutableURLRequest(URL: NSURL(string: "https://api.dropboxapi.com/2/files/get_metadata")!)
let session = NSURLSession.sharedSession()
request.HTTPMethod = "POST"
request.addValue("application/json",forHTTPHeaderField: "Content-Type")
request.addValue("path", forHTTPHeaderField: lePath)
let cursor:NSDictionary? = ["path":lePath]
do {
let jsonData = try NSJSONSerialization.dataWithJSONObject(cursor!, options: [])
request.HTTPBody = jsonData
print("json ",jsonData)
} catch {
print("snafoo alert")
}
let task = session.dataTaskWithRequest(request, completionHandler: {data, response, error -> Void in
if let error = error {
completion(string: nil, error: error)
return
}
let strData = NSString(data: data!, encoding: NSUTF8StringEncoding)
//print("Body: \(strData)\n\n")
do {
let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options:NSJSONReadingOptions.MutableContainers);
self.jsonPParser(jsonResult,field2file: "ignore")
/*for (key, value) in self.parsedJson {
print("key2 \(key) value2 \(value)")
}*/
completion(string: "", error: nil)
} catch {
completion(string: nil, error: error)
}
})
task.resume()
}

Answer 3

Like this:
var item = [
"title": "Item title",
"CreatedAt": "12:13 12/12/2016",
"isDone": false
]
var mainDictionary = [
"name": "List name",
"CreatedAt": "12:12 12/12/2016",
"items": [item]
]
And the just convert to json with NSJSONSerialization like this:
do {
let json = try NSJSONSerialization.dataWithJSONObject(mainDictionary, options: [])
} catch {
print(error)
}
UPDATE:
If you need to add values to array in dictionary you can do that like this:
if var items = mainDictionary["items"] as? NSMutableArray {
items.addObject(newItem)
mainDictionary["items"] = items
}