How best to extract raw dictionaries?

[dcaunt]

I have some JSON where one key path returns an Array<Dictionary<String,Any>>, that is an array of [String:Any] and I want to pass this to a Transformer for manipulation into a different structure.

The issue I have is that Extractor's array and arrayOptional methods expect to return an array of Decodable T. I can see why this works for Transformer<String, URL> and the like thanks to the extensions in StandardLib.swift, but [String:Any] does not conform to Decodable.

The only way I can get this to work is by adding an extension on Dictionary as follows:

extension Dictionary: Decodable {
    public static func decode(_ e: Extractor) throws -> Dictionary<Key, Value> {
        return try castOrFail(e.rawValue)
    }
}

Is this correct? Should this be part of StandardLib.swift, or am I approaching this in the wrong way?

[danielmhanover]

+1

[dcaunt]

I figured this out with a little help from #149 (comment). As Extractor implements Decodable, we can retrieve a collection and map as described:

let extractors: [String:Extractor] = e <|-| "some_key"