Expressjs：搜索查询api [英] Expressjs: Search query api

问题描述

我想用查询字符串搜索我的用户资料库。

这应该返回所有用户使用类似的用户名kyogron和类似的电子邮件kyogron @ gmail

  GET localhost：3000 / users？username = kyogron& email = [e-mail] 
  

这应该返回所有用户：

  GET localhost：3000 / users 
  

我已经设法处理路由参数，但我被困在优化它：

  app.get（'/ users'，function（req，res）{
 //创建一个mongoosejs查询对象
 var query = User.find（{}）; 
 
 //了解expressjs处理查询的方式：
 //？username = kyogron& email = kyogron @ gmail.com 
 // {username：kyogron，电子邮件：[e-mail]} 
 //console.log(req.query）; 
 
 //这是一个优化搜索查询参数的想法
 //这不行不知道为什么我总是得到一个所有用户的数组
 //甚至键和值是正确的
 Object.keys（req.query）.forEach（function（key）{
 query。 select（key，req.query [key]）; 
}）; 
 
 //这是我第一次处理参数的方式，这样做！ 
 // if（req.query.username）query.where（'username'，req.query.username）; 
 // if（req.query.email）query.where（'email'，req.query.email）; 
 
 //其余查询
 query.select（'username'，'email'）; 
 query.exec（function（err，users）{
 if（err）throw err; 
 res.json（users）; 
}）; 
 
}）; 
  

这些是我正在争取的问题：

1. 为什么不重复req.query对象工作？


2. 如何说使用通配符（例如kyo *）的mongoose

如果有人可以帮助我，会很好：）

编辑：

第二个问题可以用$解决：

  if（req.query.username）{
 query。$ where（function（）{
 return this.username === req.query.username; //这里我们需要一个正则表达式
}）; 
} 
  

Thos不工作...有人可以给我一个提示吗？ / p>

EDIT2：

没有管理$我现在发现

  query.where（'username'）。regex（）; 
  

我只需要寻找一个搜索正则表达式，寻找类似的单词

EDIT3：

我发现这个线程：如何使用like查询MongoDB？我在mongoosejs组中询问我如何用mongoose

EDIT4：

  if（req.query.username） {
 query.where（'username'）。regex（new RegExp（\ /+ req.query.username +\ /））; 
} 
  

我几乎得到了。只需要修复这个愚蠢的正则表达式...

解决方案

  app.get（'用户'，function（req，res）{
 var query = User.find（{}）; 
 
 Object.keys（req.query）.forEach（function（key）{
 query.where（key）.regex（new RegExp（req.query [key]））; 
}）; 
 
 / * 
 if（req.query .username）{
 query.where（'username'）。regex（new RegExp（req.query.username））; 
} 
 if（req.query.email）{
 query.where（'email'）。regex（new RegExp（req.query.email））; 
} * / 
 
 query.select（'username'，'email' ）; 
 query.exec（function（err，users）{
 if（err）throw err; 
 res.json（users）; 
}）; 
 
}）; 
  

第一个没有工作，因为我有一个打字错误（.select（）没有.where（） ）。第二个被发现在一个额外的线程

我仍然不确定所选择的方法。

迭代req.query将允许代码可重用（可能作为前提路由参数功能），但它很容易发生错误

I want to search through my user repository with a query string.

This should return all users with a similar username "kyogron" and similar email "kyogron@gmail"

GET localhost:3000/users?username=kyogron&email=[e-mail]

This should return all users:

GET localhost:3000/users

I already managed to handle the routing parameters but I am stuck at optimizing it:

app.get('/users', function(req, res) {
    // creates a mongoosejs query object
    var query = User.find({});

    // to understand how expressjs handles queries:
    // ?username=kyogron&email=[e-mail]
    // { username: "kyogron", email: "[e-mail]" }
    //console.log(req.query);

    // this was one idea of optimizing the search query parameters
    // this doesn't work don't know why I always get an array of ALL users
    // even the key and value is right
    Object.keys(req.query).forEach(function(key) {
        query.select(key, req.query[key]);
    });

    // this was the way I was first handling the parameters, this works !!
    //if (req.query.username) query.where('username', req.query.username);
    //if (req.query.email) query.where('email', req.query.email);

    // the rest of the query
    query.select('username', 'email');
    query.exec(function(err, users) {
        if (err) throw err;
        res.json(users);
    });

});

These are the problems I am fighting with:

1. Why doesn't iterating the req.query object work?
2. How do I say mongoose to use a wildcard (e.g. kyo*)

Would be nice if somebody could help me out :)

Regards

EDIT:

The second issue would be solvable with $where:

    if (req.query.username) {
        query.$where(function() {
            return this.username === req.query.username; // here we need a regex check
        });
    }

Thos doesn't work... Could somebody give me a hint?

EDIT2:

Didn't managed anything with $where... however I now found

query.where('username').regex();

I just have to look for a searching regex which looks for similar words

EDIT3:

I found this thread: How to query MongoDB with "like"? I ask in the mongoosejs group how I could do this with mongoose

EDIT4:

if (req.query.username) {
            query.where('username').regex(new RegExp("\/"+req.query.username+"\/"));
}

I nearly got it. Just have to fix this stupid regex...

解决方案

app.get('/users', function(req, res) {
    var query = User.find({});

    Object.keys(req.query).forEach(function(key) {
        query.where(key).regex(new RegExp(req.query[key]));
    });

    /*
    if (req.query.username) {
        query.where('username').regex(new RegExp(req.query.username));
    }
    if (req.query.email) {
        query.where('email').regex(new RegExp(req.query.email));
    }*/

    query.select('username', 'email');
    query.exec(function(err, users) {
        if (err) throw err;
        res.json(users);
    });

});

The first didn't work because I had a typo (.select() not .where()). The second was found in an extra thread

I am still a bit unsure about the chosen approach.

Iterating req.query would allow to make the code reusable (maybe as precondition routing parameter-function) but it is quite susceptible for errors

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