ArrayAsRootContainer.md

Use Array instead of Dictionary as JSON root container

Moya is using dictionary as a root container for JSON data. But sometimes you will need to send JSON array as a root element instead. Here is solution by using .custom parameter encoding (see discussion in #467):

Define JsonArrayEncoding closure:

    var req = request.URLRequest
let JsonArrayEncodingClosure: (URLRequestConvertible, [String: Any]?) -> (URLRequest, Error?) = { request, data in

    do {
        let json = try JSONSerialization.data(withJSONObject: data!["jsonArray"]!, options: .prettyPrinted)
        req.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")
        req.httpBody = json
    } catch {
        return (req, nil)
    }
    return (req, nil)
}

Configure target :

  var parameters: [String: Any]? {
        switch self {
        case .someAPI:
            return ["jsonArray": ["Yes", "What", "Abc"]]
        default:
            return nil
        }
    }

    var parameterEncoding: Moya.ParameterEncoding {
        switch self {
        case .someAPI:
            return ParameterEncoding.custom(JsonArrayEncodingClosure)
        default:
            return ParameterEncoding.json
        }
    }

This will send data as JSON array ["Yes", "What", "Abc"] for .someAPI endpoint.