How to fetch JSON data in chain of links and put it to the same model?

Question

I don't know how to put it correctly so I will show in pictures.

I create first URLSession, fetch data from JSON, including links to data I want to use in the same Model.

first link:

SchreenShot

From first request I got links to other info I want to use in the same table:

links from first link:

ScreenShot

I'm trying to fetch data from both first and second link and put it together in one data model/table/cell.

I need to make another URLSession, but I can't understood how put info together. Is it possible to fire one URLSession inside another? Any suggestions how to make it?

please add your code also as text. select the code and press the button `{}` then it gets an indention of 4 spaces and is displayed as code. (you can leave the images) — muescha, Feb 02 '17 at 00:05
Send a notice to delete this question since I want describe problem with code. — odvan, Feb 02 '17 at 14:49

score 0 · Answer 1 · answered Feb 01 '17 at 23:55

I would recommend using some libraries to abstract some complexity - Alamofire/SwiftyJSON

Alamofire.request(url, method: .get).responseJSON { response in
switch response.result {
case .success(let value):
    let json = JSON(value)
    //pull your links out of the json and make another request here
    Alamofire.request(json["fixtures"]["competition"]["href"], method: .get).responseJSON { response in
       switch response.result {
          case .success(let value): 
          let json2 = JSON(value)
          //handle the json from your second request
        }
   }
}

Keep in mind that this is pseudo code. Don't try to cut and paste - but it should get you in the general direction.

Its something i thought about, put second URLSession into another. But app crashed with findind null unwrapping some variable. — odvan, Feb 02 '17 at 02:04
SwiftyJSON will help with parsing JSON and safely unwrapping null. But, without your actual code, its impossible to help you out more. — dmorrow, Feb 02 '17 at 12:16

score 0 · Answer 2 · answered Feb 02 '17 at 00:40

0

create a job queue where you place your task (=Retrieve Data) into.

start the queue with your root url call. when it comes back from async call, parse the JSON data - populate your local structs as data holder. and the next 1 or 2 links to follow you put in the queue.

maybe remember the already retrieved URL in a Array so you can check that you don't read some data twice.

NOTE: there is a call rate limit on the api site. if you create an public app then you should think how to serverside cache all the calls to be under 50/24h or 50/1min

answered Feb 02 '17 at 00:40

muescha

1,544
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Its not public, just for training. – odvan Feb 02 '17 at 02:05
So the logic is: start first session, put task into custom created queue, retrieve data, put it in struct, then i create another task to retrieve more deep level data. Where should i reload table and how populate cells? Just put some data from one struct and some data from other? But the problem is i need to do something like array of tasks. For example today its 8 games, 16 teams, i need 16 tasks? – odvan Feb 02 '17 at 02:13

score 0 · Answer 3 · answered Feb 02 '17 at 10:53

0

I think i found the solution, should use 'dispatch group'.

answered Feb 02 '17 at 10:53

odvan

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How to fetch JSON data in chain of links and put it to the same model?

3 Answers3