The more I use Codable, the less suited to networking it becomes. In
reading a variety of blog posts about implementing custom Decodable support
from JSON, I kept running across the same pattern. Basically, users had started
implementing their own decoding protocols which wrap Decodable types, and have
a type that represents the JSON representation and then their real type, with
an initializer connecting the two. But apparently this is Apple’s official
solution, which is rather terrible since it would be completely unnecessary if
the Decodable APIs were more flexible or we could access keys by key path
rather than nesting full containers. I can’t image how much code I would have
to add to decode the nasty JSON APIs I’ve used Argo to parse before. Every type
would need an underlying raw representation that, at the very least, would need
custom keys, lest I pollute even those models with the terrible keys the JSON
actually has. Not to mention the various transforms I needed. Once I hit any
reasonably complex API, Argo is far far simpler to implement in fewer lines of
code.
In trying to make Argo’s JSON enum Decodable itself, I can’t seem to
find a way to access the Any representation of the raw JSON. In fact, it
appears there’s no way to represent an Any value in Codable at all, which makes
Codable rather useless for the scenarios like the one that prompted this
thread. Without such an ability it’s impossible to actually use Codable with
all of the JSON out there, where other solutions work just fine. Argo’s JSON
type is decodable by Argo, so you can use it to represent a blob of JSON just
fine. Other existing JSON frameworks have similar solutions.
Jon
> On Jun 18, 2017, at 3:21 AM, Rien via swift-users <[email protected]>
> wrote:
>
> Dang, hit send too soon. Sorry.
>
> This does not address your question, so please ignore… (foot in mouth)!
>
> 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 09:19, Rien <[email protected]> wrote:
>>
>> 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
>>> <[email protected]> wrote:
>>>
>>> Say I have a JSON object such as:
>>>
>>> {
>>> "id": "4yq6txdpfadhbaqnwp3",
>>> "email": "[email protected]",
>>> "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
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> swift-users mailing list
>>> [email protected]
>>> https://lists.swift.org/mailman/listinfo/swift-users
>>
>
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