node.js 使用 Mongoose 通过 ObjectId 查找 MongoDB 文档
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Finding a MongoDB document by ObjectId with Mongoose
提问by David Yeiser
I am trying to update a document in MongoDB by finding it by the ObjectId. The work flow is as follows (this is for a blog).
我正在尝试通过 ObjectId 查找文档来更新 MongoDB 中的文档。工作流程如下（这是一个博客）。
- Create a new post in MongoDB by passing a title and body. The ObjectId is automatically created.
- Go to edit the post. It uses the ObjectId from the URL to grab it from the database and display it in the same new post form, just with the preexisting values.
- When the submit button is clicked I want to find the document by the ObjectId and update the values in the database with those in the post form.
- 通过传递标题和正文在 MongoDB 中创建一个新帖子。ObjectId 是自动创建的。
- 去编辑帖子。它使用 URL 中的 ObjectId 从数据库中获取它并以相同的新帖子表单显示它，只是使用预先存在的值。
- 单击提交按钮时，我想通过 ObjectId 查找文档，并使用帖子表单中的值更新数据库中的值。
Step 1 & 2 work fine, but step 3 doesn't seem to be working. It redirects to the page I need it to. But the database has not been updated. It's the same value as it was before.
第 1 步和第 2 步工作正常，但第 3 步似乎不起作用。它重定向到我需要它的页面。但是数据库没有更新。它与之前的值相同。
Here's the relevant code for the update post portion:
这是更新帖子部分的相关代码：
app.js
应用程序.js
app.post "/office/post/:id/update", ensureAuthenticated, routes.updatePost
routes/index.js
路线/ index.js
mongoose = require 'mongoose'
ObjectId = mongoose.Types.ObjectId
Post = require '../models/Post'
...
updatePost: function(req, res) {
var o_id, the_id;
the_id = req.params.id;
console.log(the_id); // 510e05114e2fd6ce61000001
o_id = ObjectId.fromString(the_id);
console.log(o_id); // 510e05114e2fd6ce61000001
return Post.update({
"_id": ObjectId.fromString(the_id)
}, {
"title": "CHANGE"
}, res.redirect("/office/edit/posts"));
}
I'm using Express and Mongoose.
我正在使用 Express 和 Mongoose。
This is also the post model if that helps:
如果有帮助，这也是后期模型：
(function() {
var Post, Schema, mongoose;
mongoose = require('mongoose');
Schema = mongoose.Schema;
Post = new Schema({
title: String,
subhead: String,
body: String,
publish_date: {
type: Date,
"default": Date.now
},
mod_date: {
type: Date,
"default": Date.now
}
});
module.exports = mongoose.model('Post', Post);
}).call(this);
And here's the code for the edit blog post view:
这是编辑博客文章视图的代码：
app.js
应用程序.js
app.get("/office/post/:id/edit", ensureAuthenticated, routes.editPost);
routes/index.js
路线/ index.js
editPost: function(req, res) {
return Post.findById(req.params.id, function(err, post) {
return res.render('edit-post', {
post: post,
title: post.title
});
});
}
采纳答案by Bentheitroad
The problem is how you call update
问题是你怎么打电话 update
return Post.update({
"_id": ObjectId.fromString(the_id)
}, {
"title": "CHANGE"
}, res.redirect("/office/edit/posts"));
The last argument will actually redirect the page, whereas updateexpects a function to be called when the update is complete
最后一个参数将实际重定向页面，而update期望在更新完成时调用一个函数
You should pass in
你应该传入
return Post.update({
"_id": ObjectId.fromString(the_id)
}, {
"title": "CHANGE"
}, function(err, model) {
if (err) // handleerr
res.redirect("/office/edit/posts"));
});
That way, we only redirect once the model is successfully updated
这样，我们只在模型成功更新后重定向
