How to Get JSON array which will be later stored in Realm table?

Question

This is part of JSON my API returns, I don't know how to get that and store in Realm table?

 "images": {
                "image1": {
                    "url": "http://www.example.com/900150983cd24fb0d6963f7d28e17f72.gif",
"path": "data/2clb91218/900150983aassfb0d6963f7d28e17f72.gif",
                "alt": "YWJj"
                },
                "image2": {
                    "url": "http://example/tex/fbce4a1ebe576539394e9493e30c7e5e.gif",
"path": "data/2clb91218/900150983cd24fb0d6963f7d28e332g22.gif",
                "alt": "Yaaase22"
                },
                "image3": {
                    "url": "https://example.amazonaws.com/card/480_300/9/9jpul1218.jpg",
    "path": "data/2clb91218/ewfregwrgw6963f7d28e17f72.gif",
                "alt": "pic3"
                }
            }

NOTE : Don't test these urls, I didnt want to put real ones.
NOTE : In object 'Images', child-object's names are chaining so we have: 'image1' , 'image2' etc.

I have read on Stack Overflow that for storing arrays in RealmTable, we need to use non-dynamic List<>, so this is how I store image-urls in class:

var images = List<String>()

This is part of my responseJSON function where I am trying to Get images from API, continue is there just to Get another objects if images are unable to Get :

guard let images = data["images"] as? [String: Any?],
                     let image = images["image1"] as? [String: String], 
                     let imageUrl = image["url"] as?  String
                 else { print("error") ; continue }

This above works for 'image1', but what about other image names, how to handle them? And one more problem - Images object can return NIL if there are no images which can aslo happen. If it's nil, I want to put "null" in RealmTable's column 'images' of the type I mentioned above.
I hope you can fully understand me, if not, comment and I will try to explain better.

Answer 1

You need

guard let images = data["images"] as? [String:[String:Any]] else { return }
let res = Array(images.values)
let urls = res.compactMap { $0["url"] as? String }
print("All urls : ",urls)