blocks|key|383963|text|没有从mongoose中删除集合的方法，最好的做法是删除其中一个的内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|383964|Model.remove({},+function(err)+{+
+++console.log('collection+removed')+
});|code-block|syntax|javascript|383965|但是有一种方法可以访问mongodb本机javascript驱动程序，该驱动程序可用于此目的|383966|mongoose.connection.collections['collectionName'].drop(+function(err)+{
++++console.log('collection+dropped');
});|383967|警告|383968|在尝试之前进行备份，以防出现任何错误！|383969|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

There is no method for dropping a collection from mongoose, the best you can do is remove the content of one :

<pre><code>Model.remove({}, function(err) { 
 console.log('collection removed') 
});
</code></pre>

But there is a way to access the mongodb native javascript driver, which can be used for this

<pre><code>mongoose.connection.collections['collectionName'].drop( function(err) {
 console.log('collection dropped');
});
</code></pre>

<h3>Warning</h3>

Make a backup before trying this in case anything goes wrong!

blocks|key|383994|text|如果连接上还不存在数据库，Mongoose将创建一个数据库，因此一旦您建立了连接，您就可以查询它，看看其中是否有任何内容。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|383995|您可以删除连接到的任何数据库：|383996|var+mongoose+=+require('mongoose');
/*+Connect+to+the+DB+*/
mongoose.connect('mongodb://localhost/mydatabase',function(){
++++/*+Drop+the+DB+*/
++++mongoose.connection.db.dropDatabase();
});|code-block|syntax|javascript|383997|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Mongoose will create a database if one does not already exist on connection, so once you make the connection, you can just query it to see if there is anything in it.

You can drop any database you are connected to:

<pre><code>var mongoose = require('mongoose');
/* Connect to the DB */
mongoose.connect('mongodb://localhost/mydatabase',function(){
 /* Drop the DB */
 mongoose.connection.db.dropDatabase();
});
</code></pre>

blocks|key|599900|text|如果您像这样修改@hellslam的解决方案，那么它将会工作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|599901|在集成测试之后，我使用此技术删除数据库|599902|//CoffeeScript
mongoose+=+require+"mongoose"
conn+=+mongoose.connect("mongodb://localhost/mydb")

conn.connection.db.dropDatabase()

//JavaScript
var+conn,+mongoose;
mongoose+=+require("mongoose");
conn+=+mongoose.connect("mongodb://localhost/mydb");

conn.connection.db.dropDatabase();|code-block|syntax|javascript|599903|HTH至少对我来说是这样的，所以我决定分享=)|599904|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

If you modify @hellslam's solution like this then it will work

I use this technique to drop the Database after my integration tests

<pre><code>//CoffeeScript
mongoose = require "mongoose"
conn = mongoose.connect("mongodb://localhost/mydb")

conn.connection.db.dropDatabase()

//JavaScript
var conn, mongoose;
mongoose = require("mongoose");
conn = mongoose.connect("mongodb://localhost/mydb");

conn.connection.db.dropDatabase();
</code></pre>

HTH at least it did for me, so I decided to share =)

blocks|key|384112|text|尝试了@hellslam和@silverfighter的答案。我发现了一个比赛条件，让我的测试推迟了。在我的例子中，我运行的是mocha测试，而在测试的the函数中，我想要擦除整个DB。以下是对我有效的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|384113|var+con+=+mongoose.connect('mongodb://localhost/mydatabase');
mongoose.connection.on('open',+function(){
++++con.connection.db.dropDatabase(function(err,+result){
++++++++done();
++++});
});|code-block|syntax|javascript|384114|你可以阅读更多https://github.com/Automattic/mongoose/issues/1469|offset|length|384115|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/Automattic/mongoose/issues/1469^0|0|0|7|1E|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Tried @hellslam's and @silverfighter's answers. I found a race condition holding my tests back. In my case I'm running mocha tests and in the before function of the test I want to erase the entire DB. Here's what works for me.

<pre><code>var con = mongoose.connect('mongodb://localhost/mydatabase');
mongoose.connection.on('open', function(){
 con.connection.db.dropDatabase(function(err, result){
 done();
 });
});
</code></pre>

You can read more <a href="https://github.com/Automattic/mongoose/issues/1469">https://github.com/Automattic/mongoose/issues/1469</a>

blocks|key|384127|text|从Mongoose+v4.7.0开始，这对我是有效的|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|384128|mongoose.connection.dropDatabase();|code-block|syntax|javascript|384129|entityMap^0|A|6|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

This works for me as of Mongoose <code>v4.7.0</code>:

<pre><code>mongoose.connection.dropDatabase();
</code></pre>

blocks|key|600231|text|2020年更新|type|unstyled|depth|inlineStyleRanges|entityRanges|data|600232|创建一个名为drop.js的新文件，即，并放入其中|600233|require('dotenv').config()
const+url+=+process.env.ATLAS_URI;
mongoose.connect(url,+{
++useNewUrlParser:+true,
++useCreateIndex:+true,
++useUnifiedTopology:+true,
++useFindAndModify:+false
});

const+connection+=+mongoose.connection;
connection.once('open',+()+=>+{
++console.log("MongoDB+database+connection+established+successfully");
})


mongoose.connection.dropDatabase().then(
++async()+=>+{
+++
++++try+{
++++++mongoose.connection.close()
+++++
++++}
++++catch+(err)+{
++++++console.log(err)
++++}

+}
++
);|code-block|syntax|javascript|600234|在你的package.json中|600235|in+your+package.json+
+"scripts":+{
++++
++++"drop":+"node+models/drop.js",
+++
++}|600236|在你的控制台上运行它|600237|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

2020 update
make a new file call it drop.js i.e
and put inside
<pre><code>require('dotenv').config()
const url = process.env.ATLAS_URI;
mongoose.connect(url, {
 useNewUrlParser: true,
 useCreateIndex: true,
 useUnifiedTopology: true,
 useFindAndModify: false
});

const connection = mongoose.connection;
connection.once('open', () =&gt; {
 console.log(&quot;MongoDB database connection established successfully&quot;);
})


mongoose.connection.dropDatabase().then(
 async() =&gt; {
 
 try {
 mongoose.connection.close()
 
 }
 catch (err) {
 console.log(err)
 }

 }
 
);
</code></pre>
in your package.json
<pre><code>in your package.json 
 &quot;scripts&quot;: {
 
 &quot;drop&quot;: &quot;node models/drop.js&quot;,
 
 }
</code></pre>
run it on ur console and

blocks|key|600063|text|beforeEach((done)+=>+{
++++++mongoose.connection.dropCollection('products',(error+,result)+=>+{
++++++if+(error)+{
++++++++console.log('Products+Collection+is+not+dropped')
++++++}+else+{
++++++++console.log(result)
++++++}
++++done()
++++})
++})|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|600064|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>beforeEach((done) =&gt; {
 mongoose.connection.dropCollection('products',(error ,result) =&gt; {
 if (error) {
 console.log('Products Collection is not dropped')
 } else {
 console.log(result)
 }
 done()
 })
 })
</code></pre>

blocks|key|384307|text|mongoose.connect(`mongodb://localhost/${dbname}`,+{
++++++++useNewUrlParser:+true,
++++++++useCreateIndex:+true,
++++++++useFindAndModify:+true,
++++++++useUnifiedTopology:+true
++++})
++++++++.then((connection)+=>+{
++++++++++++mongoose.connection.db.dropDatabase();
++++++++});|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|384308|要删除整个数据库，只需传递名称...这个版本在4.4版本上工作得很好|unstyled|384309|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>mongoose.connect(`mongodb://localhost/${dbname}`, {
 useNewUrlParser: true,
 useCreateIndex: true,
 useFindAndModify: true,
 useUnifiedTopology: true
 })
 .then((connection) =&gt; {
 mongoose.connection.db.dropDatabase();
 });
</code></pre>
To delete a complete database, just pass the name...
This one is working perfectly fine on version 4.4

blocks|key|384248|text|由于在mongoose库中remove方法已经失效，因此我们可以使用不带参数的deleteMany函数。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|384249|Model.deleteMany();|code-block|syntax|javascript|384250|这将删除此特定Model的所有内容，并且您的集合将为空。|384251|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Since the remove method is depreciated in the mongoose library we can use the deleteMany function with no parameters passed.

<pre><code>Model.deleteMany();
</code></pre>

This will delete all content of this particular Model and your collection will be empty.

blocks|key|600167|text|要删除集合中的所有文档，请执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|600168|await+mongoose.connection.db.dropDatabase();|code-block|syntax|javascript|600169|这个答案基于mongoose+index.d.ts文件：|600170|dropDatabase():+Promise<any>;|600171|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

To drop all documents in a collection:

<pre><code>await mongoose.connection.db.dropDatabase();
</code></pre>

This answer is based off the mongoose index.d.ts file:

<pre><code>dropDatabase(): Promise&lt;any&gt;;
</code></pre>

blocks|key|384180|text|要删除集合中的所有文档：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|384181|myMongooseModel.collection.drop();|code-block|syntax|javascript|384182|如tests中所示|offset|length|384183|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/Automattic/mongoose/blob/67c465aac5c864c3004d11d49934605037c8f520/test/shard.test.js#L297^0|0|0|1|5|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

For dropping all documents in a collection:

<pre><code>myMongooseModel.collection.drop();
</code></pre>

as seen in the <a href="https://github.com/Automattic/mongoose/blob/67c465aac5c864c3004d11d49934605037c8f520/test/shard.test.js#L297" rel="nofollow noreferrer">tests</a>

I'm preparing a database creation script in Node.js and Mongoose.
How can I check if the database already exists, and if so, drop (delete) it using Mongoose?

I could not find a way to drop it with Mongoose.

How to drop a database with Mongoose?

集成测试

数据库

MongoDB

我正在准备一个用Node.js和Mongoose创建数据库的脚本。我如何检查数据库是否已经存在，如果存在，使用Mongoose删除它？我找不到办法把它和Mongoose放在一起。

问如何使用Mongoose删除数据库？
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