I think you are looking for [$pull][1], which &quot;removes all instances of a value from an existing array&quot;.


    db.collection.update(
      {name: &#39;object1&#39;}, 
      {$pull: { tags: &#39;dah&#39;}});

  [1]: http://docs.mongodb.org/manual/reference/operator/pull/

I have 6 options, I want to get the checked values to store them in variable on second page. How do I go on doing that?&lt;br/&gt;

    &lt;form action=&quot;third.php&quot; method=&quot;get&quot;&gt;
        &lt;!-- Choices --&gt;
        Red     &lt;input type=&quot;checkbox&quot; name=&quot;color[]&quot; id=&quot;color&quot; value=&quot;Red&quot;&gt;
        Green   &lt;input type=&quot;checkbox&quot; name=&quot;color[]&quot; id=&quot;color&quot; value=&quot;Green&quot;&gt;
        Blue    &lt;input type=&quot;checkbox&quot; name=&quot;color[]&quot; id=&quot;color&quot; value=&quot;Blue&quot;&gt;
        Cyan    &lt;input type=&quot;checkbox&quot; name=&quot;color[]&quot; id=&quot;color&quot; value=&quot;Cyan&quot;&gt;
        Magenta &lt;input type=&quot;checkbox&quot; name=&quot;color[]&quot; id=&quot;color&quot; value=&quot;Magenta&quot;&gt;
        Yellow  &lt;input type=&quot;checkbox&quot; name=&quot;color[]&quot; id=&quot;color&quot; value=&quot;Yellow&quot;&gt;
        Black   &lt;input type=&quot;checkbox&quot; name=&quot;color[]&quot; id=&quot;color&quot; value=&quot;Black&quot;&gt;
        &lt;!-- Submit --&gt;
        &lt;input type=&quot;submit&quot; value=&quot;submit&quot;&gt;
    &lt;/form&gt;

And `third.php` page :

    $color = $_GET[&#39;color&#39;];
     
    echo &#39;The color is &#39;.$color;

If I remove `[]`, I get the color is on, when I do it like `color[]` I get a notice saying : 

&gt; Array to string conversion

What I want is the value of checked, checkboxes so I can store it in variable.



Getting checkbox values on submit

Is it possible to override `onBackPressed()` for only one activity ? 

On back button click I want to call a dialog on a specific Activity, but in all other activities i want it to work as it worked before (going to previous activities).

**EDITED**

Thank you everyone for your answers, I already had everything like you told me, but my problem was that when i was clicking back button on another Activity, I was going to my previous Activity (The one where i had back button Overridden) and i thought that it wasn&#39;t working, i thought it was overriding `onBackPressed()` in whole Application, now i got it.

Android Overriding onBackPressed()

I&#39;m aware of the [$addToSet][1] method for MongoDB, but I can&#39;t find a &quot;remove&quot; equivalent anywhere in the docs. 

What&#39;s the best way to achieve this? Trying to achieve something like the following:

    obj = {
      name: &#39;object1&#39;,
      tags: [&#39;fus&#39;, &#39;ro&#39;, &#39;dah&#39;]
    }

    db.collection.update({
      name: &#39;object1&#39;
    }, {
      $removeFromSet: {
        tags: &#39;dah&#39;
      }
    });


  [1]: http://docs.mongodb.org/manual/reference/operator/addToSet/

MongoDB opposite of $addToSet

I'm aware of the <a href="http://docs.mongodb.org/manual/reference/operator/addToSet/" target="_blank" rel="noopener noreferrer">$addToSet</a> method for MongoDB, but I can't find a "remove" equivalent anywhere in the docs.
What's the best way to achieve this? Trying to achieve something like the following:
<pre><code class="hljs language-css">obj = {
 name: 'object1',
 tags: ['fus', 'ro', 'dah']
}

db.collection.update({
 name: 'object1'
}, {
 $removeFromSet: {
 tags: 'dah'
 }
});
</code></pre>

I&#39;m doing a python script that writes some data to a mongodb.
I need to close the connection and free some resources, when finishing.

How is that done in Python?

How to close a mongodb python connection?

If someone can provide some insights here I would GREATLY appreciate it. 

I am new to MongoDB, and (relatively) new to the command line. 

I had a express/node.js app running on MongoDB locally successfully, but upon restarting my computer, I attempted to restart the Mongo server and it began giving errors and wouldn&#39;t start. Since then, I have re-installed Mongo several times only to find the same error occurring. this is what I am receiving:

    privee:mongodb-osx-x86_64-2.4.6 jonlinton$ ./bin/mongo
    MongoDB shell version: 2.4.6
    connecting to: test
    Mon Aug 26 14:48:47.168 Error: couldn&#39;t connect to server 127.0.0.1:27017 at     src/mongo/shell/mongo.js:145
    exception: connect failed

Am I missing a step? Should I be creating a config file? Some basic guidance would be really helpful. Thanks in advance for any insights.

Installing and Running MongoDB on OSX

I&#39;m building an app using meteor.js and MongoDB and I have a question about cursor.forEach().
I want to check some conditions in the beginning of each forEach iteration and then skip the element if I don&#39;t have to do the operation on it so I can save some time.

Here is my code:

    // Fetch all objects in SomeElements collection
    var elementsCollection = SomeElements.find();
    elementsCollection.forEach(function(element){
      if (element.shouldBeProcessed == false){
        // Here I would like to continue to the next element if this one 
        // doesn&#39;t have to be processed
      }else{
        // This part should be avoided if not neccessary
        doSomeLengthyOperation();
      }
    });
    
I know I could turn cursor to array using cursor.find().fetch() and then use regular for-loop to iterate over elements and use continue and break normally but I&#39;m interested if there is something similiar to use in forEach().



&quot;continue&quot; in cursor.forEach()

I have just started up with `mongodb` and I recently gone through `Mongoose`, an ODM framework.


On the documentation, I couldn&#39;t find why we need to use `Mongoose`. One reason I can give is we can define application schema from `Mongoose`.

I am looking for more possible reasons, and needs that will attract me to use `Mongoose`.

Please list all possible advantages and reasons/needs why use `Mongoose`.

Why do we need, what advantages to use mongoose

In so many introductory examples of using MongoDB, you see code like this:

    var MongoClient = require(&#39;mongodb&#39;).MongoClient;
    MongoClient.connect(&quot;mongodb://localhost:port/adatabase&quot;, function(err, db)
    {
        /* Some operation... CRUD, etc. */
        db.close();
    });

If MongoDB is like any other database system, `open` and `close` operations are typically expensive time-wise. 

So, my question is this: Is it OK to simply do the `MongoClient.connect(&quot;...` once, assign the returned `db` value to some module global, have various functions in the module do various database-related work (insert documents into collections, update documents, etc. etc.) when they&#39;re called by other parts of the application (and thereby re-use that `db` value), and then, when the application is done, only then do the `close`. 

In other words, `open` and `close` are done once - not every time you need to go and do some database-related operation. And you keep re-using that `db` object that was returned during the initial `open\connect`, only to dispose of it at the end, with the `close`, when you&#39;re actually done with all your database-related work. 

Obviously, since all the I/O is asynch, before the `close` you&#39;d make sure that the last database operation completed before issuing the `close`. Seems like this should be OK, but i wanted to double-check just in case I&#39;m missing something as I&#39;m new to MongoDB. Thanks!

Keeping open a MongoDB database connection

I have applied for an internship in a company and as a question they have asked me to create a schema for their company with certain requirements and mail them the *DDL* file. I have installed Oracle database 11g Express edition, but how do I create a new schema in Oracle database 11g? I have searched in the net for a solution but I could not understand what to do. And after creating a schema, which file should I mail them?

How to create a new schema/new user in Oracle Database 11g?

I am trying to visualize tables and their relations using pgAdmin. I have understood that there is a [query visualizer tool][1] available for pgAdmin. However, that only is useful if you are dealing with queries. My main goal is to generate a graphical representation of all the tables available in database.


  [1]: http://link.sheidaei.com/byqyv

How to visualize database tables in postgresql using pgAdmin?

On a non-rooted android device, I can navigate to the data folder containing the database using the `run-as` command with my package name. Most files types I am content with just viewing, but with the database I would like to pull if from the android device.

Is there a `download` `copy` or `move` command from this part of adb shell? I would like to download the database file and view its content using a database browser.

One answer here involves turning entire application package into a compressed archive, but there is no further answer on how to extract that archive once this is done and moved to the machine, leaving me very sidetracked when there might be a more direct solution to begin with

Retrieve database or any other file from the Internal Storage using run-as

I&#39;m using PostgreSQL 9.1. I have the column name of a table. Is it possible to find the table(s) that has/have this column? If so, how?

Content Type	Original Author	Original Content on Stackoverflow
Question	JVG	View Question on Stackoverflow
Solution 1 - Mongodb	Thilo	View Answer on Stackoverflow

MongoDB opposite of $addToSet

Mongodb Problem Overview

Mongodb Solutions

Solution 1 - Mongodb

Android Overriding onBackPressed()

Getting checkbox values on submit

Attributions