json - 来自 `[String: Any]` 字典的 Vapor JSON

Question

如果我构建一个 Swift 字典，即 [String: Any] 我如何将其作为 JSON 返回？我试过了，但它给了我错误:Argument labels '(node:)' do not match any available overloads。

drop.get("test") { request in
    var data: [String: Any] = [:]

    data["name"] = "David"
    data["state"] = "CA"

    return try JSON(node: data)
}

Answer 1

非常复杂，但这允许您使用 [String:Any].makeNode()，只要内部是 NodeRepresentable、NSNumber based 或 NSNull :) --

import Node

enum NodeConversionError : LocalizedError {
    case invalidValue(String,Any)
    var errorDescription: String? {
        switch self {
        case .invalidValue(let key, let value): return "Value for \(key) is not NodeRepresentable - " + String(describing: type(of: value))
        }
    }
}

extension NSNumber : NodeRepresentable {
    public func makeNode(context: Context = EmptyNode) throws -> Node {
        return Node.number(.double(Double(self)))
    }
}

extension NSString : NodeRepresentable {
    public func makeNode(context: Context = EmptyNode) throws -> Node {
        return Node.string(String(self))
    }
}

extension KeyAccessible where Key == String, Value == Any {
    public func makeNode(context: Context = EmptyNode) throws -> Node {
        var mutable: [String : Node] = [:]
        try allItems.forEach { key, value in
            if let _ = value as? NSNull {
                mutable[key] = Node.null
            } else {
                guard let nodeable = value as? NodeRepresentable else { throw NodeConversionError.invalidValue(key, value) }
                mutable[key] = try nodeable.makeNode()
            }
        }
        return .object(mutable)
    }

    public func converted<T: NodeInitializable>(to type: T.Type = T.self) throws -> T {
        return try makeNode().converted()
    }
}

使用该 header ，您可以:

return try JSON(node: data.makeNode())