javascript - graphql查询到json查询

Question

鉴于此 GraphQL example ，我如何在 Javascript 中用 JSON 做类似的请求？

示例中使用 GraphQL 的查询是:

{
  trip(
    from: {place: "NSR:StopPlace:5533" },
    to: {place:"NSR:StopPlace:5532"}
  ) 
    {
    tripPatterns{duration}
  } 
}

根据文档，要查询的 URL 是 https://api.entur.io/journey-planner/v2/graphql .

这是我在 Javascript 中尝试过的:

var url = "https://api.entur.io/journey-planner/v2/graphql";

var tripquery = 
{
    trip: 
    {
        __args: {
            from : {place :"NSR:StopPlace:5533" },
            to : {place :"NSR:StopPlace:5532" }                     
        },
        tripPatterns: {
            duration : true             
        }
    }
};

function jsonQuery(){

    var qry = JSON.stringify(tripquery);
    var url_qry = url + "?query=" + qry;

    var xhttp = new XMLHttpRequest();
    xhttp.open("POST", url_qry, true);
    xhttp.setRequestHeader("Content-Type", "application/json");

    xhttp.onreadystatechange = function(){
        console.log("onreadystatechange");
        if(xhttp.readyState === 4 && xhttp.status === 200){
            console.log("json-query-OK");
            console.log(xhttp.responseText);
        }
        else{
            console.log("xhttp.status      : " + xhttp.status);
            console.log("xhttp.statusText  : " + xhttp.statusText);
            console.log("xhttp.readyState  : " + xhttp.readyState);
            console.log("xhttp.responseType: " + xhttp.responseType);
            console.log("xhttp.responseText: " + xhttp.responseText);
            console.log("xhttp.responseURL : " + xhttp.responseURL);
            console.log("json-not-ok");
        }
    };



    xhttp.send();
    console.log("query sent");
}

上面的代码将在控制台中产生以下输出:

query sent
api.entur.io/journey-planner/v2/graphql?query={%22trip%22:{%22__args%22:{%22from%22:{%22place%22:%22NSR:StopPlace:5533%22},%22to%22:{%22place%22:%22NSR:StopPlace:5532%22}},%22tripPatterns%22:{%22duration%22:true}}}:1 POST https://api.entur.io/journey-planner/v2/graphql?query={%22trip%22:{%22__args%22:{%22from%22:{%22place%22:%22NSR:StopPlace:5533%22},%22to%22:{%22place%22:%22NSR:StopPlace:5532%22}},%22tripPatterns%22:{%22duration%22:true}}} 400 (Bad Request)
query.js:29 onreadystatechange
query.js:35 xhttp.status      : 400
query.js:36 xhttp.statusText  : Bad Request
query.js:37 xhttp.readyState  : 2
query.js:38 xhttp.responseType: 
query.js:39 xhttp.responseText: 
query.js:40 xhttp.responseURL : https://api.entur.io/journey-planner/v2/graphql?query={%22trip%22:{%22__args%22:{%22from%22:{%22place%22:%22NSR:StopPlace:5533%22},%22to%22:{%22place%22:%22NSR:StopPlace:5532%22}},%22tripPatterns%22:{%22duration%22:true}}}
query.js:41 json-not-ok
query.js:29 onreadystatechange
query.js:35 xhttp.status      : 400
query.js:36 xhttp.statusText  : Bad Request
query.js:37 xhttp.readyState  : 3
query.js:38 xhttp.responseType: 
query.js:39 xhttp.responseText: No query found in body
query.js:40 xhttp.responseURL : https://api.entur.io/journey-planner/v2/graphql?query={%22trip%22:{%22__args%22:{%22from%22:{%22place%22:%22NSR:StopPlace:5533%22},%22to%22:{%22place%22:%22NSR:StopPlace:5532%22}},%22tripPatterns%22:{%22duration%22:true}}}
query.js:41 json-not-ok
query.js:29 onreadystatechange
query.js:35 xhttp.status      : 400
query.js:36 xhttp.statusText  : Bad Request
query.js:37 xhttp.readyState  : 4
query.js:38 xhttp.responseType: 
query.js:39 xhttp.responseText: No query found in body
query.js:40 xhttp.responseURL : https://api.entur.io/journey-planner/v2/graphql?query={%22trip%22:{%22__args%22:{%22from%22:{%22place%22:%22NSR:StopPlace:5533%22},%22to%22:{%22place%22:%22NSR:StopPlace:5532%22}},%22tripPatterns%22:{%22duration%22:true}}}
query.js:41 json-not-ok

Json对象中的__args是我从网上的例子中得到的，但我并没有真正理解它。

也许我不确定到底要搜索什么，但我找不到关于如何将此 GraphQL 查询转换为 JSON 对象的一些很好的解释。

Answer 1

我遇到了同样的问题，我是这样做的:

{
  c_con_tic_PTF(dz: CR, docmanId: 123) {
    docmanId
    dz
    data
  }
}

我尝试在 OS X 中将此请求作为 curl 命令发送 How to use CURL in OS X :

curl \
      -X POST \
      -H "Content-Type: application/json" \
      --data '{ "query": "{  c_con_tic_PTF(docmanId: 123, dz: CR) { docmanId, dz, data }}" }' \

   *my-graphicQL endpoint url*

我得到了我想要的回应。

所以你想从你的 graphQL 查询中做这样的事情:

{ "query": "{  cz_atlascon_etic_PTF(docmanId: 123, dz: CR) { docmanId, dz, data }}" }

现在只需使用 JS 发送请求。如果它以任何方式帮助你，这就是我的请求在 Java 中的样子:

HttpRequest mainRequest =
HttpRequest.newBuilder()
.uri(URI.create("my graphQL endpoint"))
.POST(HttpRequest.BodyPublishers.ofString("{ \"query\": \"{  c_con_tic_PTF(docmanId: 123, dz: CR) { docmanId, dz, data }}\" }"))
.build();