Question

我正在修改当前设置为从JSON文件中提取问题，提示和答案的闪存卡应用程序。我想从Mongo数据库中提取所有这些信息。

我有一个名为＆＃39; flashcards＆＃39;还有一个名为“卡片”的系列。已在MongoDB本地设置。卡片＆＃39;集合中已经有五个文件 - 每个文件都有一个问题，一个提示和一个答案。

我有一个这样的路线设置：localhost:5000/${id}?side=${question/answer}我希望用id和问题或答案填充它，根据我在＆＃39中相关文档的ID显示问题或答案;卡＆＃39;收集在Mongo。

从JSON中提取每个问题都很简单，您只需设置一个需要JSON文件的变量，然后您可以使用点表示法或括号表示法访问每个元素。即：

const cards = require('./data/flashcardData.json');

一般格式如下：

cards[id][side];

抓住第一张牌和问题方的具体例子：

cards[0][question];

JSON供参考：

{

"data": {

"title": "JavaScript Flashcards",
"cards": [
  {
    "question": "What language are Express apps written in?",
    "hint": "It starts with a \"J\"",
    "answer": "JavaScript"
  },
  {
    "question": "What is one way a website can store data in a user's browser?",
    "hint": "They are delicious with milk",
    "answer": "Cookies"
  },
  {
    "question": "What is a common way to shorten the response object's name inside middleware?",
    "hint": "It has the same abbreviation as \"resolution\"",
    "answer": "res"
  },
  {
    "question": "How many different values can booleans have?",
    "hint": "Think: binary",
    "answer": "2"
  },
  {
    "question": "Which HTML element can contain JavaScript?",
    "hint": "It starts with an \"s\"",
    "answer": "<script>"
  }
]
  }
}

以下是＆＃39;卡片＆＃39;收集在＆＃39;抽认卡＆＃39;数据库看起来与上面相同的信息：

{
  "_id": ObjectId("5a8b3084c926c61f9f90b61a"),
  "question": "What language are Express apps written in?",
  "hint": "It starts with a \"J\" ",
  "answer": "Javascript"
}
{
  "_id": ObjectId("5a8b31eac5fcfe1fc032ceda"),
  "question": "What is one way a website can store data in a user's browser?",
  "hint": "They are delicious with milk",
  "answer": "Cookies"
}
{
  "_id": ObjectId("5a8b31eac5fcfe1fc032cedb"),
  "question": "What is a common way to shorten the response object's name inside middleware?",
  "hint": "It has the same abbreviation as \"resolution\" ",
  "answer": "res"
}
{
  "_id": ObjectId("5a8b31eac5fcfe1fc032cedc"),
  "question": "How many different values can booleans have?",
  "hint": "Think binary",
  "answer": "2"
}
{
  "_id": ObjectId("5a8b3264e122b41fce2fbcbd"),
  "question": "Which HTML element can contain JavaScript?",
  "hint": "It starts with an \"s\" ",
  "answer": "<script>"
}

我如何使用Mongo复制以前发生的事情？

如何根据路由中的变量访问MongoDB中的数据？

0 个答案: