findOne NodeJS MongoDB 驱动程序
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findOne NodeJS MongoDB driver
提问by Leahcim
I have JSON data like you see below in a collection called 'English', for which I'm setting up a REST api with a nodejs app using the MongoDB driver. If I do the following, I get all the JSON data returned in the browser.
我有 JSON 数据，就像您在下面一个名为“英语”的集合中看到的那样，我正在使用 MongoDB 驱动程序设置带有 nodejs 应用程序的 REST api。如果我执行以下操作，我将获得浏览器中返回的所有 JSON 数据。
app.get('/sentences', function (req, res){
db.collection('english', function(err, collection) {
collection.find().toArray(function(err, items) {
res.send(items);
});
});
})
However, when I try to go to /sentences/1to get one record, the app is freezing (the half-moon in the browser tab turns slowly) and there's no error logged. Is there something wrong with how I'm doing this findOne?
但是，当我尝试去/sentences/1获取一条记录时，该应用程序冻结（浏览器选项卡中的半月转得很慢）并且没有记录错误。我做这个 findOne 的方式有什么问题吗？
app.get('/sentences/:id', function(req,rest){
var query = { 'question' : req.params.id };
console.log(query);
console.log('query');
db.collection('english', function(err, collection) {
collection.findOne(query, function(err, item) {
console.log(err);
res.send(item);
});
});
});
JSON data
JSON 数据
[
{
"_id": "526c0e21977a67d6966dc763",
"question": "1",
"uk": "blah blah blah",
"us": "blah blah balh"
},
{
"_id": "526c0e21977a67d6966dc764",
"question": "2",
"uk": "Tom went outside for a fag. I think he smokes too much!",
"us": "Tom went outside for a cigarette. I think he smokes too much!"
},
{
"_id": "526c0e21977a67d6966dc765",
"question": "3",
"uk": "Do you fancy going to the cinema on Friday?",
"us": "How about going to the movies on Friday"
}
]
Update
更新
What's happening is that the app is eventually timing out and I get a No data receivedmessage in the browser.
发生的事情是应用程序最终超时，我No data received在浏览器中收到一条消息。
回答by Muhammad Shahzad
nodejs mongodb findOne by id
nodejs mongodb findOne by id
It is late but will be helpful others.
为时已晚，但会对其他人有所帮助。
var id = new require('mongodb').ObjectID('58fcf02b1ab5de07e2a1aecb');//req.params.id
db.collection('users').findOne({'_id':id})
.then(function(doc) {
if(!doc)
throw new Error('No record found.');
console.log(doc);//else case
});
回答by Leahcim
The problem was a typo in one of the arguments (an extra 't' in 'res'). Instead of
问题是其中一个参数的拼写错误（'res' 中的一个额外的 't'）。代替
app.get('/sentences/:id', function(req,rest){
...
res.send(item);
should have been
本来应该
app.get('/sentences/:id', function(req,res){
...
res.send(item);
回答by Mohamed Ali
It is not good but still will be helpful others.
这不好，但仍然会对其他人有所帮助。
var id = new require('mongodb').ObjectID('58fcf02b1ab5de07e2a1aecb');//req.params.id
db.collection('users').findOne({'_id':id})
.then(function(doc) {
if(!doc)
throw new Error('No record found.');
console.log(doc);//else case
});
