Close. Use `db.originalCollectionName.renameCollection(&#39;newCollectionName&#39;)` 

See http://www.mongodb.org/display/DOCS/renameCollection+Command

Assume that the database name is &quot;**mytestdb**&quot; and collection name is &quot;**orders**&quot;. collection name change to **orders2015** The simplest way is, 

    &gt; use mytestdb
    &gt; db.orders.renameCollection( &quot;orders2015&quot; )

**Note :** db.collection.renameCollection() is not supported on sharded collections.



For those who cannot rename, because the name causes an issue like: SyntaxError: Unexpected token ILLEGAL, it is because the name is illegal. 

You can work around this by calling with brackets notation: `db[&quot;oldCollectionILLEGALName&quot;].renameCollection(&quot;someBetterName&quot;)`

In case you are using Node.js MongoDB driver:

```
mongoClient.db(dbName).collection(&#39;oldName&#39;).rename(&quot;newName&quot;);
```


https://mongodb.github.io/node-mongodb-native/3.5/api/Collection.html#rename

my case was using mongoose:

```
await mongoose.connection.collection(&quot;oldName&quot;).rename(&quot;newName&quot;);
```

Rename a collection in cmd:
```
cd C:\Program Files\MongoDB\Server\4.2\bin
mongo
use yourdb
db.yourcollection.renameCollection(&quot;someBetterName&quot;)
```
This example is made for MongoDB 4.2

You can use the following syntax to rename an existing collection in MongoDB.

 `db.originalCollectionName.renameCollection(&#39;newCollectionName&#39;)`

For instance, if your existing collection name is &#39;demo&#39; and want to rename to &#39;demo_updated&#39; then, the query would be as follows:-

    db.demo.renameCollection(&#39;demo_updated&#39;)

Thanks!

I have a DateTime object which I&#39;m currently formating via

    $mytime-&gt;format(&quot;D d.m.Y&quot;)
Which gives me exactly the format I need:
&gt;Tue 5.3.2012

The only missing point is the correct language. I need German translation of `Tue` (`Tuesday`), which is `Die` (`Dienstag`).

This gives me the right locale setting

    Locale::getDefault()
But I don&#39;t know how to tell `DateTime::format` to use it.

Isn&#39;t there a way to do something like:

    $mytime-&gt;format(&quot;D d.m.Y&quot;, \Locale::getDefault());

Formatting DateTime object, respecting Locale::getDefault()

5.3.4 `[expr.new]` of the C++11 Feb draft gives the example: 
    
&gt; `new(2,f) T[5]` results in a call of `operator new[](sizeof(T)*5+y,2,f)`.
&gt;
&gt; Here, x and y are non-negative unspecified values representing array allocation overhead; the result of the _new-expression_ will be offset by this amount from the value returned by `operator new[]`. This overhead may be applied in all array _new-expressions_, including those referencing the library function `operator new[](std::size_t, void*)` and other placement allocation functions. The amount of overhead may vary from one invocation of new to another. _—end example_ ]

Now take the following example code:

    void* buffer = malloc(sizeof(std::string) * 10);
    std::string* p = ::new (buffer) std::string[10];

According to the above quote, the second line `new (buffer) std::string[10]` will internally call `operator new[](sizeof(std::string) * 10 + y, buffer)` (before constructing the individual `std::string` objects). The problem is that if `y &gt; 0`, the pre-allocated buffer will be too small!

So how do I know how much memory to pre-allocate when using array placement-new?

    void* buffer = malloc(sizeof(std::string) * 10 + how_much_additional_space);
    std::string* p = ::new (buffer) std::string[10];

Or does the standard somewhere guarantee that `y == 0` in this case? Again, the quote says:

&gt; This overhead may be applied in all array _new-expressions_, including those referencing the library function `operator new[](std::size_t, void*)` and other placement allocation functions. 

Array placement-new requires unspecified overhead in the buffer?

Is there a dead easy way to rename a collection in mongo?  Something like:

    db.originalCollectionName.rename(&#39;newCollectionName&#39;);

And if not, what is the best way to go about effectively renaming one?

How can I rename a collection in MongoDB?

Is there a dead easy way to rename a collection in mongo? Something like:
<pre><code class="hljs language-lua">db.originalCollectionName.rename('newCollectionName');
</code></pre>
And if not, what is the best way to go about effectively renaming one?

I know that ObjectIds contain the date they were created on. Is there a way to query this aspect of the ObjectId?


Can I query MongoDB ObjectId by date?

I&#39;m doing a simple insert into Mongo...

    db.notes.insert({ title: &quot;title&quot;, details: &quot;note details&quot;})


After the note document is inserted, I need to get the object id immediately. The result that comes back from the insert has some basic info regarding connection and errors, but no document and field info.

I found some info about using the update() function with upsert=true, I&#39;m just not sure if that&#39;s the right way to go, I have not yet tried it. 




How to get the object id in PyMongo after an insert?

I&#39;m using mongoose in a script that is not meant to run continuously, and I&#39;m facing what seems to be a very simple issue yet I can&#39;t find an answer; simply put once I make a call to any mongoose function that sends requests to mongodb my nodejs instance never stops and I have to kill it manually with, say, Ctrl+c or Program.exit().

The code looks roughly like this:

    var mongoose = require(&#39;mongoose&#39;);
 
    // if my program ends after this line, it shuts down as expected, my guess is that the connection is not really done here but only on the first real request ?
    mongoose.connect(&#39;mongodb://localhost:27017/somedb&#39;); 

    // define some models

    // if I include this line for example, node never stop afterwards
    var MyModel =  mongoose.model(&#39;MyModel&#39;, MySchema);

I tried adding calls to mongoose.disconnect() but no to result. Aside from that, everything works fine (finding, saving, ...).

This is the exact same issue as this person, sadly he did not receive any answer: https://groups.google.com/group/mongoose-orm/browse_thread/thread/c72cc1c51c76e661

Thanks

EDIT: accepted the answer below as it is technically correct, but if anyone ever hit this problem again, it seems that mongoose and/or the mongodb driver does not actually close the connection when you ask it to if there are still queries running.

It does not even remember the disconnect call at all, it does not do it once queries are finished running; it just discards your call with no exception thrown or anything of the sort, and never actually close the connection.

So there you have it: make sure that every query has been processed before calling disconnect() if you want it to actually work.

Properly close mongoose&#39;s connection once you&#39;re done

I have a data like this in mongodb

    { 
        &quot;latitude&quot; : &quot;&quot;, 
        &quot;longitude&quot; : &quot;&quot;, 
        &quot;course&quot; : &quot;&quot;, 
        &quot;battery&quot; : &quot;0&quot;, 
        &quot;imei&quot; : &quot;0&quot;, 
        &quot;altitude&quot; : &quot;F:3.82V&quot;, 
        &quot;mcc&quot; : &quot;07&quot;, 
        &quot;mnc&quot; : &quot;007B&quot;, 
        &quot;lac&quot; : &quot;2A83&quot;, 
        &quot;_id&quot; : ObjectId(&quot;4f0eb2c406ab6a9d4d000003&quot;), 
        &quot;createdAt&quot; : ISODate(&quot;2012-01-12T20:15:31Z&quot;) 
    }

How do I query `db.gpsdatas.find({&#39;createdAt&#39;: ??what here??})`, so that it returns the above data result to me from the db?

return query based on date

What&#39;s the easiest way to do this from my bash prompt?

How do I drop a MongoDB database from the command line?

As far as I know, [`java.util.Hashtable`][1] synchronizes each and every method in the [`java.util.Map`][2] interface, while [`Collections.synchronizedMap(hash_map)`][3] returns a wrapper object containing synchronized methods delegating calls to the actual `hash_map` (correct me if I am wrong).

**I have two questions :**

1. What difference does it make to synchronize each and every method and to have a wrapper class? What are the scenarios to choose one over the other?

2. What happens when we do `Collections.synchronizedMap(hash_table)`? Will this be equal to simply using a normal `java.util.Hashtable`?


  [1]: http://docs.oracle.com/javase/7/docs/api/java/util/Hashtable.html
  [2]: http://docs.oracle.com/javase/7/docs/api/java/util/Map.html
  [3]: http://docs.oracle.com/javase/7/docs/api/java/util/Collections.html#synchronizedMap(java.util.Map)

Difference between Hashtable and Collections.synchronizedMap(HashMap)

I&#39;d like to know if I can get the first element of a list or set.  Which method to use?

How to get the first element of the List or Set?

From the [Collections Framework Overview][1]:  

&gt; Collections that do not support modification operations (such as `add`, `remove` and `clear`) are referred to as *unmodifiable*. Collections that are not unmodifiable are *modifiable*.
&gt;
&gt; Collections that additionally guarantee that no change in the `Collection` object will be visible are referred to as *immutable*. Collections that are not immutable are *mutable*.

I cannot understand the distinction.    
What is the difference between *unmodifiable* and *immutable* here?  


  [1]: http://docs.oracle.com/javase/8/docs/technotes/guides/collections/overview.html

Immutable vs Unmodifiable collection

Im trying to sort through an arraylist of objects by a particular value within the object. What would be the best approach to do such a thing. Should I use Collections.sort() with some kind of comparator? 

Im trying to sort a list of objects by a float value they hold in one of the variables.


EDIT:
This is what I have so far:

    public class CustomComparator implements Comparator&lt;Marker&gt; {
	    @Override
	    public int compare(Mark o1, Mark o2) {
	        return o1.getDistance().compareTo(o2.getDistance());
	    }
	}

the error states: Cannot invoke compareTo(double) on the primitive type double.

Is it because a comparator cant return anything other than a certain type?


Android-java- How to sort a list of objects by a certain value within the object

`LinkedHashMap` is used to preserve insertion order in the map, but this only works for mutable maps. Which is the immutable `Map` implementation that preserves insertion order?


Immutable Scala Map implementation that preserves insertion order

I need to rename `indentifier` in this:

    { &quot;general&quot; : 
      { &quot;files&quot; : 
        { &quot;file&quot; : 
          [  
            {  &quot;version&quot; : 
              {  &quot;software_program&quot; : &quot;MonkeyPlus&quot;,      
                 &quot;indentifier&quot; : &quot;6.0.0&quot; 
              } 
            } 
          ] 
        } 
      } 
    }


I&#39;ve tried

    db.nrel.component.update(
      {},
      { $rename: {
        &quot;general.files.file.$.version.indentifier&quot; : &quot;general.files.file.$.version.identifier&quot;
      } },
      false, true
    )

but it returns: `$rename source may not be dynamic array`.

MongoDB rename database field within array

Path of source file is : `/public_html/upload/64/SomeMusic.mp3`

And I want to move it to this path : `/public_html/archive/2011/05/64/SomeMusic.mp3`

How can i do this using FTP commands?

 

How to move files using FTP commands

I just renamed my local branch using

    git branch -m oldname newname

but this only renames the local version of the branch. How can I rename the one on&#160;GitHub?

Renaming a branch in GitHub

I am trying to rename a file to have different capitalization from what it had before:

    git mv src/collision/b2AABB.js src/collision/B2AABB.js
    fatal: destination exists, source=src/collision/b2AABB.js, destination=src/collision/B2AABB.js

As you can see, Git throws a fit over this. I tried renaming using just the plain old `mv` command as well, but Git doesn&#39;t pick up the rename (as a rename *or* as a new untracked file).

How can I change a file to have a different capitalization of the same name? I am on Mac&amp;nbsp;OS&amp;nbsp;X&amp;nbsp;v10.7.3 (Lion) with Git 1.7.9.1 using [Z shell][1] (zsh) 4.3.15.

  [1]: https://en.wikipedia.org/wiki/Z_shell





Changing capitalization of filenames in Git

I think it should work to copy the directory to be renamed to a new directory with desired name, and [delete the old directory][1], and `git add`,  `git commit` and `push` everything.  But is this the best way?


  [1]: https://stackoverflow.com/questions/1947430/git-remove-directory

Content Type	Original Author	Original Content on Stackoverflow
Question	Aaron Silverman	View Question on Stackoverflow
Solution 1 - Mongodb	nav	View Answer on Stackoverflow
Solution 2 - Mongodb	Lakshmikandan	View Answer on Stackoverflow
Solution 3 - Mongodb	Ev0oD	View Answer on Stackoverflow
Solution 4 - Mongodb	arispen	View Answer on Stackoverflow
Solution 5 - Mongodb	Uku Lele	View Answer on Stackoverflow
Solution 6 - Mongodb	Arun Kumar N	View Answer on Stackoverflow

How can I rename a collection in MongoDB?

Mongodb Problem Overview

Mongodb Solutions

Solution 1 - Mongodb

Solution 2 - Mongodb

Solution 3 - Mongodb

Solution 4 - Mongodb

Solution 5 - Mongodb

Solution 6 - Mongodb

Array placement-new requires unspecified overhead in the buffer?

Formatting DateTime object, respecting Locale::getDefault()

Attributions