`bundle update` and `bundle install` can both install the gems you specified in Gemfile but missing in gems.

But `bundle update` does one thing more to upgrade:

1. If the gems specified in Gemfile don&#39;t have version, it will upgrade to whatever latest.
2. If the gems specified in Gemfile have version controlled with `~&gt;`, it will upgrade to the latest **at the final digit**, the patch version.

    For example, if you have a gem in Gemfile

        &#39;foo_gem&#39;, &#39;~&gt; 2.1.0&#39;

    `bundle update` will check if newer version of 2.1.x is available in cloud. Say your current version is 2.1.2 and what&#39;s latest in cloud is 2.1.5, it will install 2.1.5. But if `2.2.6` is the newest, it won&#39;t do anything.

**Better practice in my opinion**

1. Always add version to critical gems like `rails`.

2. Stick to `bundle install`(or `bundle` which is default to `install`) in most cases. Only do `bundle update` when it&#39;s really necessary and you are fully prepared for the result.

`Bundle Update`s the gems specified (all gems, if none are specified), ignoring the previously installed gems specified in the Gemfile.lock. In general, you should use `bundle install` to install the same exact gems and versions across machines.

Say I have a data table

        1  2  3  4  5  6 ..  n
    A   x  x  x  x  x  x ..  x
    B   x  x  x  x  x  x ..  x
    C   x  x  x  x  x  x ..  x

And I want to slim it down so that I only have, say, columns 3 and 5 deleting all other and maintaining the structure. How could I do this with pandas? I think I understand how to delete a single column, but I don&#39;t know how to save a select few and delete all others.

Keep certain columns in a pandas DataFrame, deleting everything else

Facebook&#39;s Messenger, has a priority of `2147483647`, for their `android.provider.Telephony.SMS_RECEIVED` broadcast receiver, declared in their manifest. 

(It&#39;s sad we are forced to not follow the documentation&#39;s standards of max priority being 1000 because other apps make their own rules)

I understand that if my priority is also set to the ridiculously high level of `2147483647` that I&#39;d have to have my app installed first to take precedence over any &quot;ties&quot;. No problem, I made a screen to alert users what apps would probably need to be uninstalled then re-installed after my app to function properly.

But, here&#39;s the problem - Everything works fine, but as soon as the phone reboots, &quot;Messenger&quot; starts getting precedence over my app. I&#39;ve looked all over the place to see how they could do this black magic. **How do they do this? How do I get priority after reboot, when my app is installed first?**

The only thing that has come to mind so far, is package names being ordered alphabetically on boot when registering broadcast receivers.

com. **f** acebook &gt; com. **s** trikeforcezero

I was about to attempt to register my broadcast receiver on `android.intent.action.BOOT_COMPLETED` but I have a feeling this won&#39;t work.

Messenger also has another &quot;low priory broadcast receiver&quot; for `android.provider.Telephony.SMS_RECEIVED` set to `-1`

Facebook&#39;s &quot;Messenger&quot; has a SMS Broadcast Receiver that takes highest priority after reboot

Could you tell me, whats the difference between: 

    $Bundle update

and

    $Bundle install

Difference between $Bundle install and $Bundle update

Could you tell me, whats the difference between:
<pre><code class="hljs language-bash">$Bundle update
</code></pre>
and
<pre><code class="hljs language-bash">$Bundle install
</code></pre>

In rails &gt;4.0.0 generators creates CRUD operations with ```before_action``` not ```before_filter```. It seems to do the same thing. So what&#39;s the difference between these two? 

Rails 4: before_filter vs. before_action

Given that I have a `Personable` concern in my Rails 4 application which has a `full_name` method, how would I go about testing this using RSpec?

**concerns/personable.rb**

    module Personable
      extend ActiveSupport::Concern
    
      def full_name
        &quot;#{first_name} #{last_name}&quot;
      end
    end



How to Test a Concern in Rails

In Rails 3, it was possible to insert an attribute into params like so:

    params[:post][:user_id] = current_user.id

I&#39;m attempting to do something similar in Rails 4, but having no luck:

    post_params[:user_id] = current_user.id

    . . . .

    
    private
    
      def post_params
        params.require(:post).permit(:user_id)
      end

Rails is ignoring this insertion. It doesn&#39;t throw any errors, it just quietly fails.

Rails 4: Insert Attribute Into Params

I have a functioning Rails 3 app that uses has_many :through associations which is not, as I remake it as a Rails 4 app, letting me save ids from the associated model in the Rails 4 version. 

These are the three relevant models are the same for the two versions. 


Categorization.rb

    class Categorization &lt; ActiveRecord::Base
    
      belongs_to :question
      belongs_to :category
    end


Question.rb
    
    has_many :categorizations
    has_many :categories, through: :categorizations

Category.rb

    has_many :categorizations
    has_many :questions, through: :categorizations

In both apps, the category ids are getting passed into the create action like this

      &quot;question&quot;=&gt;{&quot;question_content&quot;=&gt;&quot;How do you spell car?&quot;, &quot;question_details&quot;=&gt;&quot;blah &quot;, &quot;category_ids&quot;=&gt;[&quot;&quot;, &quot;2&quot;],

In the Rails 3 app, when I create a new question, it inserts into questions table and then into the categorizations table 


     SQL (82.1ms)  INSERT INTO &quot;questions&quot; (&quot;accepted_answer_id&quot;, &quot;city&quot;, &quot;created_at&quot;, &quot;details&quot;, &quot;province&quot;, &quot;province_id&quot;, &quot;question&quot;, &quot;updated_at&quot;, &quot;user_id&quot;) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)  [[&quot;accepted_answer_id&quot;, nil], [&quot;city&quot;, &quot;dd&quot;], [&quot;created_at&quot;, Tue, 14 May 2013 17:10:25 UTC +00:00], [&quot;details&quot;, &quot;greyound?&quot;], [&quot;province&quot;, nil], [&quot;province_id&quot;, 2], [&quot;question&quot;, &quot;Whos&#39; the biggest dog in the world&quot;], [&quot;updated_at&quot;, Tue, 14 May 2013 17:10:25 UTC +00:00], [&quot;user_id&quot;, 53]]
      SQL (0.4ms)  INSERT INTO &quot;categorizations&quot; (&quot;category_id&quot;, &quot;created_at&quot;, &quot;question_id&quot;, &quot;updated_at&quot;) VALUES (?, ?, ?, ?)  [[&quot;category_id&quot;, 2], [&quot;created_at&quot;, Tue, 14 May 2013 17:10:25 UTC +00:00], [&quot;question_id&quot;, 66], [&quot;updated_at&quot;, Tue, 14 May 2013 17:10:25 UTC +00:00]]

In the rails 4 app, after it processes the parameters in QuestionController#create, I&#39;m getting this error in the server logs

    Unpermitted parameters: category_ids

and the question is only getting inserted into the questions table

     (0.2ms)  BEGIN
      SQL (67.6ms)  INSERT INTO &quot;questions&quot; (&quot;city&quot;, &quot;created_at&quot;, &quot;province_id&quot;, &quot;question_content&quot;, &quot;question_details&quot;, &quot;updated_at&quot;, &quot;user_id&quot;) VALUES ($1, $2, $3, $4, $5, $6, $7) RETURNING &quot;id&quot;  [[&quot;city&quot;, &quot;dd&quot;], [&quot;created_at&quot;, Tue, 14 May 2013 17:17:53 UTC +00:00], [&quot;province_id&quot;, 3], [&quot;question_content&quot;, &quot;How&#39;s your car?&quot;], [&quot;question_details&quot;, &quot;is it runnign&quot;], [&quot;updated_at&quot;, Tue, 14 May 2013 17:17:53 UTC +00:00], [&quot;user_id&quot;, 12]]
       (31.9ms)  COMMIT

Although I am not storing the category_ids on the Questions model, I set category_ids as a permitted parameter in the questions_controller

       def question_params
        	
          params.require(:question).permit(:question_details, :question_content, :user_id, :accepted_answer_id, :province_id, :city, :category_ids)
        end

Can anyone explain how I&#39;m supposed to save the category_ids?  Note, there is no create action in the categories_controller.rb of either app.

These are the three tables that are the same in both apps

     create_table &quot;questions&quot;, force: true do |t|
        t.text     &quot;question_details&quot;
        t.string   &quot;question_content&quot;
        t.integer  &quot;user_id&quot;
        t.integer  &quot;accepted_answer_id&quot;
        t.datetime &quot;created_at&quot;
        t.datetime &quot;updated_at&quot;
        t.integer  &quot;province_id&quot;
        t.string   &quot;city&quot;
      end

     create_table &quot;categories&quot;, force: true do |t|
        t.string   &quot;name&quot;
        t.datetime &quot;created_at&quot;
        t.datetime &quot;updated_at&quot;
      end
    
      create_table &quot;categorizations&quot;, force: true do |t|
        t.integer  &quot;category_id&quot;
        t.integer  &quot;question_id&quot;
        t.datetime &quot;created_at&quot;
        t.datetime &quot;updated_at&quot;
      end


Update

This is the create action from the Rails 3 app

      def create
          @question = Question.new(params[:question])
          respond_to do |format|
          if @question.save
            format.html { redirect_to @question, notice: &#39;Question was successfully created.&#39; }
            format.json { render json: @question, status: :created, location: @question }
          else
            format.html { render action: &quot;new&quot; }
            format.json { render json: @question.errors, status: :unprocessable_entity }
          end
        end
	end

This is the create action from the Rails 4 app


   

       def create
          @question = Question.new(question_params)
          
           respond_to do |format|
          if @question.save
            format.html { redirect_to @question, notice: &#39;Question was successfully created.&#39; }
            format.json { render json: @question, status: :created, location: @question }
          else
            format.html { render action: &quot;new&quot; }
            format.json { render json: @question.errors, status: :unprocessable_entity }
          end
        end
        end


This is the question_params method

     private
        def question_params	
          params.require(:question).permit(:question_details, :question_content, :user_id, :accepted_answer_id, :province_id, :city, :category_ids)
        end

how to permit an array with strong parameters

How can I embed my rails app into another website via iframe?

It works nicely with RoR 3, but not with RoR 4:

    &lt;iframe src=&quot;http://myrailsapp.com/&quot; width=&quot;100%&quot; height=&quot;50&quot; id=&quot;rails_iframe&quot;&gt;error!&lt;/iframe&gt;

I tried to use `verify_authenticity_token` and `protect_from_forgery` options in my controller... seems it&#39;s something else (but I&#39;m not sure).

upd. Example:
http://jsfiddle.net/zP329/

Content Type	Original Author	Original Content on Stackoverflow
Question	matDobek	View Question on Stackoverflow
Solution 1 - Ruby on-Rails	Billy Chan	View Answer on Stackoverflow
Solution 2 - Ruby on-Rails	Denny Mueller	View Answer on Stackoverflow

Difference between $Bundle install and $Bundle update

Ruby on-Rails Problem Overview

Ruby on-Rails Solutions

Solution 1 - Ruby on-Rails

Solution 2 - Ruby on-Rails

Facebook's "Messenger" has a SMS Broadcast Receiver that takes highest priority after reboot

Keep certain columns in a pandas DataFrame, deleting everything else

Attributions