如何遍历 JSON 数组并记录具有特定值的属性

Question

我有一个看起来像这样的响应正文

{
   "data_sets":[
    { 
           "author": {
               "name": "foo"
           },
           "category": "zip",
           "client": true,
           "data_type": "zip",
           "index": "completed",
           "id": 200,
           "params": {}
    },
    {
           "author": {
               "name": "foo2"
           },
           "category": "zip",
           "client": true,
           "data_type": "zip",
           "index": "completed",
           "id": 190,
           "params": {}
    }]}

我试图在我的邮递员测试中迭代我的数千个数据集，并且只是简单地 console.log 等于我的环境变量中的 id 的 id。对于这种情况，假设是 190。我正在尝试这样的事情，但它不起作用。它没有失败，但没有给我预期的输出。

这是我在邮递员中的代码

    pm.test("the response has the right id", () => {
    id_dataset = pm.environment.get("id");
    var jsonData = pm.response.json();
    for(var i = 0; i < jsonData.data_sets.length; i++)
   if(jsonData.data_sets[i].id == id_dataset)
     console.log(jsonData.data_sets[i].id);
    });

有人可以帮忙吗？

Answer 1

你忘记了 .length 在你的 for

  const jsonData = {data_sets: [ { "author": { "name": "foo" }, "category": "zip", "client": true, "data_type": "zip", "index": "completed", "id": 200, "params": {} },{ "author": { "name": "foo" }, "category": "zip", "client": true, "data_type": "zip", "index": "completed", "id": 200, "params": {} },{ "author": { "name": "foo" }, "category": "zip", "client": false, "data_type": "zip", "index": "completed", "id": 200, "params": {} }, { "author": { "name": "foo2" }, "category": "zip", "client": true, "data_type": "zip", "index": "completed", "id": 190, "params": {} }]};

 const id_dataset = 200;
 for(var i = 0; i < jsonData.data_sets.length; i++)
   if(jsonData.data_sets[i].id == id_dataset)
     console.log(jsonData.data_sets[i].id);
  

你也可以使用map：

const jsonData = {data_sets: [ { "author": { "name": "foo" }, "category": "zip", "client": true, "data_type": "zip", "index": "completed", "id": 200, "params": {} },{ "author": { "name": "foo" }, "category": "zip", "client": true, "data_type": "zip", "index": "completed", "id": 200, "params": {} },{ "author": { "name": "foo" }, "category": "zip", "client": false, "data_type": "zip", "index": "completed", "id": 200, "params": {} }, { "author": { "name": "foo2" }, "category": "zip", "client": true, "data_type": "zip", "index": "completed", "id": 190, "params": {} }]};

const id_dataset = 200;

 jsonData.data_sets.map(item=>item.id==id_dataset && console.log(item.id))

Answer 2

我们应该可以使用find()快速搜索所有记录，找到匹配id为190的记录。试试这个：

pm.test("the response has the right id", () => {
    id_dataset = pm.environment.get("id"); // 190
    var jsonData = pm.response.json();
    console.log(jsonData.data_sets.find(set => set.id === id_dataset)?.id);
});

这里是原版 JS 中的相同逻辑：

let id_dataset = 190;

let data_sets = [ { "author": { "name": "foo" }, "category": "zip", "client": true, "data_type": "zip", "index": "completed", "id": 200, "params": {} }, { "author": { "name": "foo2" }, "category": "zip", "client": true, "data_type": "zip", "index": "completed", "id": 190, "params": {} }];

console.log(data_sets.find(set => set.id === id_dataset)?.id);