Javascript Mongoose：获取完整的用户列表
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Mongoose: Get full list of users
提问by Randomblue
I have tried to use Mongoose to send the list of all users as follows:
我尝试使用 Mongoose 发送所有用户的列表，如下所示：
server.get('/usersList', function(req, res) {
var users = {};
User.find({}, function (err, user) {
users[user._id] = user;
});
res.send(users);
});
Of course, res.send(users);is going to send {}, which is not what I want. Is there a findalternative with slightly different semantics, where I could do the following?
当然，res.send(users);是要发送{}，这不是我想要的。是否有find语义略有不同的替代方案，我可以在其中执行以下操作？
server.get('/usersList', function(req, res) {
User.find({}, function (err, users) {
res.send(users);
});
});
Essentially, I want the callback to be executed only when all the users have been fetched from the database.
本质上，我希望只有在从数据库中获取所有用户时才执行回调。
回答by soulcheck
Well, if you really want to return a mapping from _idto user, you could always do:
好吧，如果你真的想从_idto返回一个映射user，你总是可以这样做：
server.get('/usersList', function(req, res) {
User.find({}, function(err, users) {
var userMap = {};
users.forEach(function(user) {
userMap[user._id] = user;
});
res.send(userMap);
});
});
find()returns all matching documents in an array, so your last code snipped sends that array to the client.
find()返回数组中的所有匹配文档，因此您最后剪下的代码将该数组发送到客户端。
回答by bstory
If you'd like to send the data to a view pass the following in.
如果您想将数据发送到视图，请传入以下内容。
server.get('/usersList', function(req, res) {
User.find({}, function(err, users) {
res.render('/usersList', {users: users});
});
});
Inside your view you can loop through the data using the variable users
在您的视图中，您可以使用变量 users 遍历数据
回答by Evan P
This is just an Improvement of @soulcheck 's answer, and fix of the typo in forEach (missing closing bracket);
这只是对@soulcheck 答案的改进，并修复了 forEach 中的错字（缺少右括号）；
server.get('/usersList', (req, res) =>
User.find({}, (err, users) =>
res.send(users.reduce((userMap, item) => {
userMap[item.id] = item
return userMap
}, {}));
);
);
cheers!
干杯！
回答by yasin
There was the very easy way to list your data :
有一种非常简单的方法可以列出您的数据：
server.get('/userlist' , function (req , res) {
User.find({}).then(function (users) {
res.send(users);
});
});
回答by vithu shaji
Same can be done with async await and arrow function
同样可以使用 async await 和箭头函数来完成
server.get('/usersList', async (req, res) => {
const users = await User.find({});
const userMap = {};
users.forEach((user) => {
userMap[user._id] = user;
});
res.send(userMap);
});
回答by gprathour
To make function to wait for list to be fetched.
使函数等待列表被获取。
getArrayOfData() {
return DataModel.find({}).then(function (storedDataArray) {
return storedDataArray;
}).catch(function(err){
if (err) {
throw new Error(err.message);
}
});
}
回答by Arda Kazanc?
My Solution
我的解决方案
User.find()
.exec()
.then(users => {
const response = {
count: users.length,
users: users.map(user => {
return {
_id: user._id,
// other property
}
})
};
res.status(200).json(response);
}).catch(err => {
console.log(err);
res.status(500).json({
success: false
})
})
回答by Abdallah Okasha
In case we want to list all documents in Mongoose collectionafter updateor delete
如果我们想要list all documents in Mongoose collection之后update或delete
We can edit the function to some thing like this:
我们可以将函数编辑为这样的东西：
exports.product_update = function (req, res, next) {
Product.findByIdAndUpdate(req.params.id, {$set: req.body}, function (err, product) {
if (err) return next(err);
Product.find({}).then(function (products) {
res.send(products);
});
//res.send('Product udpated.');
});
};
This will list all documentson success instead of just showing success message
这将list all documents成功而不仅仅是showing success message
