ruby-on-rails - 解析从 Unity 发送到 Ruby On Rails 的 JSON POST 数据

Question

我正在为 Unity 前端构建 Rails 服务。其中一个 Controller 在解析来 self 的 UnityWebRequest 的 JSON blob 时遇到问题.以下是 Unity 所说的发送内容:

[StoryPost] Sending request to localhost:3000/stories/new with post data [words, {"_array":[{"_text":"mailing"}]}]

这是 Rails 在收到 JSON 时记录的内容:

Started POST "/stories/new" for 127.0.0.1 at 2017-08-26 20:08:40 -0400
    Error occurred while parsing request parameters.
    Contents:

    words=%7B%22_array%22%3A%5B%7B%22_text%22%3A%22mailing%22%7D%5D%7D

    ActionDispatch::Http::Parameters::ParseError (743: unexpected token at 'words=%7B%22_array%22%3A%5B%7B%22_text%22%3A%22mailing%22%7D%5D%7D'):

    actionpack (5.1.3) lib/action_dispatch/http/parameters.rb:113:in `rescue in parse_formatted_parameters'
    actionpack (5.1.3) lib/action_dispatch/http/parameters.rb:107:in `parse_formatted_parameters'

看起来我有某种编码错误。一旦我将以下代码添加到我的网络请求中，这种情况就开始发生:

_request.SetRequestHeader("Content-Type", "application/json");
_request.SetRequestHeader("Accept", "application/json");

如果我注释掉这两个 SetRequestHeader上面提到的调用，那么这里是 Rails 记录的内容:

Started POST "/stories/new" for 127.0.0.1 at 2017-08-26 23:13:14 -0400
Processing by StoriesController#new as */*
Parameters: {"words"=>"{\"_array\":[{\"_text\":\"inspectors\"}]}"}

我添加了这段代码，以便 Rails 自动知道将我的 POST 数据解析为 JSON。有人以前见过这种类型的问题吗？ Rails 和 HTTP 的新手，但不是 Unity 的新手。

相关代码

作为引用，这是我的 Rails Controller :

class StoriesController < ApplicationController      

    def new
      post_data = params["words"]
      words_array = post_data["_array"];
      puts "words " + words_array
      story = Story.new(words_array)
      story.save()
    end    
end

这是我的 Unity 代码。注:_PostData是 Dictionary<string, string> .

protected ServiceCall()
        {
            switch (_Type)
            {
                case RequestType.Get:
                    _request = UnityWebRequest.Get(_URL);
                    break;
                case RequestType.Post:
                    _request = UnityWebRequest.Post(_URL, _PostData);
                    break;
                default:
                    throw new NullReferenceException("Unknown request type " + _Type);
            }

            _request.SetRequestHeader("Content-Type", "application/json");
            _request.SetRequestHeader("Accept", "application/json");

            _request.downloadHandler = new DownloadHandlerBuffer();

            Diag.Crumb(this, $"Sending request to {_URL} with post data {_PostData.Pretty()}");

            _requestOperation = _request.Send();
        }

这是我正在构建的方式 _PostData

    protected override Dictionary<string, string> _PostData 
    {
        get
        {
            var asArray = new JsonArray<Word>(Luke.GuessWords);
            string json = JsonUtility.ToJson(asArray);
            return new Dictionary<string, string>{{"words", json}};
        }
    }

JSONArray只是一个简单的类，它有一个 _array字段，因为 Unity 的 JsonUtility无法序列化顶级数组。

Answer 1

为了响应反馈，我的整个 POST 正文未格式化为 JSON，我改为将 _PostData 更改为返回字符串，并在我的派生类中将 _PostData 序列化为JSON。然后在基类中，我将 JSON 编码为字节并将其作为 POST 正文发送。这是我更改后的代码:

在 Rails 中:

def new
  words_array = params["_array"]
  puts "words " + words_array.to_s
  story = Story.new(words_array)
  puts "story is " + story.to_s
end

在 Unity 中:

protected override string _PostData 
{
    get
    {
        var asArray = new JsonArray<Word>(Luke.GuessWords);
        string json = JsonUtility.ToJson(asArray);
        return json;
    }
}

还有……

case RequestType.Post:
    _request = UnityWebRequest.Post(_URL, new Dictionary<string, string>());
    _request.uploadHandler = new UploadHandlerRaw
    (
        Encoding.UTF8.GetBytes(_PostData)
    );
    break;