[swift-users] Decode a JSON object of unknown format into a Dictionary with Decodable in Swift 4

[Rien]

Are you looking for a general purpose JSON interpreter / API ?

There are many of them around, and in fact I do have my own: https://github.com/Balancingrock/VJson

With VJson I would write:

let json = VJson.parse(… your json object…)

and then access the metadata as:

let buyCount = (json | ”metadata” | ”buy_count”)?.intValue

or:

var buyCount: Int &= json | “metadata” | “buy_count”

To loop over the content of metadata:

for item in (json | “metadata”) ?? [ ] {
	print (item.nameValue)
	switch item.type {
	case .object: …
	case .number: …
	case .string: …
	etc...
	}
}

Obviously I am plugging my own code here, but there are many others around, I understand that SwiftyJSON is quite popular but I have not used that myself.

Regards,
Rien

Site: http://balancingrock.nl
Blog: http://swiftrien.blogspot.com
Github: http://github.com/Balancingrock
Project: http://swiftfire.nl - An HTTP(S) web server framework in Swift







> On 18 Jun 2017, at 04:07, Chris Anderson via swift-users <swift-users at swift.org> wrote:
> 
> Say I have a JSON object such as:
> 
>   {
>     "id": "4yq6txdpfadhbaqnwp3",
>     "email": "john.doe at example.com",
>     "name":"John Doe",
>     "metadata": {
>       "link_id": "linked-id",
>       "buy_count": 4
>     }
>   }
> 
> And with a struct of:
> 
> struct User: Codable {
>   var id: String
>   var email: String
>   var name: String
> }
> 
> How can I decode the `metadata` field into a Dictionary?
> 
> I’ve tried doing things such as, in my struct,
> 
> var metadata: Dictionary
> 
> or
> 
> var metadata: [String: Any]
> 
> But I get the error 
> 
> MyPlayground.playground:3:7: note: cannot automatically synthesize 'Encodable' because '<<error type>>' does not conform to 'Encodable'
>   var metadata: Dictionary 
> 
> A meta or metadata field on many APIs (such as www.stripe.com) can contain whatever you want, and I still want to be able to process it on the Swift end. How can I store that meta data field into a Dictionary that I can parse apart manually after?
> 
> Thanks!
> 
> Chris Anderson
> 
> 	
> 
> 
> 
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