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 the 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 a JSON array ["Yes", "What", "Abc"] for the .someAPI endpoint.