The warning is [caused by a call from within Rails itself](https://github.com/rails/rails/pull/8812). The warning has been fixed in [Rails 3.2.13](http://weblog.rubyonrails.org/2013/3/18/SEC-ANN-Rails-3-2-13-3-1-12-and-2-3-18-have-been-released/).

You have to upgrade Rake file. This issue occurred in *Rails 3.2.12* but solved in **Rails 3.2.13** to solve this issue. You have to delete your `Gemfile.lock` from your app (NOTE:  As you may get error something like &quot;Rakefile locked&quot;, Take backup of Gemfile.lock file if this solution won&#39;t help).

Open your Gemfile and find `gem &#39;rails&#39;, &#39;3.2.12&#39;` and replace it with **`gem &#39;rails&#39;, &#39;3.2.13&#39;`** then in your terminal run `bundle install`. Now you will not get this warning.

I can get height in jQuery with
    
    $(item).outerHeight(true);

but how do I with JS?  



I can get the height of the li with

    document.getElementById(item).offsetHeight

but i will always get &quot;&quot; when I try margin-top:

    document.getElementById(item).style.marginTop

How to get margin value of a div in plain JavaScript?

How can one get the name and line of a function that called the current one? I would like to have a rudimentary debugging function like this (with [npmlog](https://github.com/isaacs/npmlog) defining `log.debug`):

    function debug() {
      var callee, line;
      /* MAGIC */
      log.debug(callee + &quot;:&quot; + line, arguments)
    }

When called from another function it would be something like this:
   
    function hello() {
       debug(&quot;world!&quot;)
    }
    // outputs something like:
    // &quot;hello:2 &#39;world!&#39;&quot;

For clarity, what I want is essentially analogous to [this in Python][1]:

    import inspect
    def caller():
        return inspect.stack()[2][3]
    // line no from getframeinfo().lineno

Is there a Node equivalent to accomplish this?

  [1]: https://stackoverflow.com/questions/2654113

Get name and line of calling function in node.js

I&#39;ve recently upgraded my Rails to v3.2.  The server starts and works, however I&#39;m noticing the following warning:

    Rack::File headers parameter replaces cache_control after Rack 1.5.

In my development.rb I have the following configuration for cache control:

    config.static_cache_control = &quot;public, max-age=36000&quot;

What does the warning mean and what should I do to address it?


Rails emits warning: &quot;Rack::File headers parameter replaces cache_control after Rack 1.5&quot;

I've recently upgraded my Rails to v3.2. The server starts and works, however I'm noticing the following warning:
<pre><code class="hljs language-arduino">Rack::File headers parameter replaces cache_control after Rack 1.5.
</code></pre>
In my development.rb I have the following configuration for cache control:
<pre><code class="hljs language-ini">config.static_cache_control = "public, max-age=36000"
</code></pre>
What does the warning mean and what should I do to address it?

I get this error every this I run my Rails app (It **cannot connect to my local Postgresql**)

    /Users/leonardo/.rvm/gems/ruby-1.9.3-p362/gems/activerecord-3.2.11/lib/
    active_record/connection_adapters/postgresql_adapter.rb:1208:in `initialize&#39;: 
    could not connect to server: No such file or directory (PG::Error)
       Is the server running locally and accepting
    connections on Unix domain socket &quot;/var/pgsql_socket/.s.PGSQL.5432&quot;?


I&#39;m using [**Postgres.app**][1] that it&#39;s correctly running.

If I run

    $ psql

I can login properly  to Postgresql console.

    $ which psql
     /Applications/Postgres.app/Contents/MacOS/bin/psql


***Gemfile***

    source &#39;https://rubygems.org&#39;
    ruby &quot;1.9.3&quot;
    
    gem &#39;rails&#39;, &#39;3.2.11&#39;
    gem &quot;pg&quot;

**database.yml**

    development:
      adapter: postgresql
      encoding: unicode
      username: leonardo
      password: 
      database: zapping
      port: 5432  

**Postgresql** (Console)

    $ psql
    leonardo=# \l

![enter image description here][2]


  [1]: http://postgresapp.com/
  [2]: http://i.stack.imgur.com/I5eC9.png


Postgresql adapter (pg): could not connect to server

After using RSpec for several projects, I&#39;m giving minitest/unit a go. I&#39;m liking it so far, but I miss using describe/context blocks to group my tests/specs in a logical way. 

I know minitest/spec provides this functionality, but I like that minitest/unit feels a bit closer to barebones Ruby. 

Are there any gems that provide describe/context support for minitest/unit? Or, should I just live with my long, unorganized test files in minitest/unit?

How to organize minitest/unit tests?

While testing scenario by `cucumber` i&#39;m getting the following error when running `rspec` tests

&gt;&gt; unable to obtain stable firefox connection in 60 seconds (127.0.0.1:7055) (Selenium::WebDriver::Error::WebDriverError)

Using `ruby (1.9.2)` `selenium-webdriver (2.27.2)` and `firefox (19.0)`

Using `rspec-rails (2.12.1)`, `capybara (2.0.2)` and several other gems, Also i have added `launchy` gem but they don&#39;t seem to be a problem. And i am using `Windows 7`.

Unable to obtain stable firefox connection in 60 seconds (127.0.0.1:7055)

What&#39;s the difference between `@title` and `title`? Since both of them can be variable names. Also, how do I decide which kind of variable I should use? With `@` or not? 



@ variables in Ruby on Rails

I am following the ruby.railstutorial. I run the command &quot;git push heroku master&quot; and it spits out this error.

    Permission denied (publickey).
    fatal: Could not read from remote repository.
    Please make sure you have the correct access rights
    and the repository exists.

I am inside my rails app &quot;/Users/lexi87/rails_projects/first_app&quot;. Any solutions?

git push heroku master permission denied

I was reading a book and in a chapter about Controllers when it talks about rendering stuff, for JSON it has an example like this but doesn&#39;t go in to details so I couldn&#39;t figure out the bigger picture that this example fits in:

    render :json =&gt; @projects, :include =&gt; tasks


And also some example with JSONP using it with callback functions:

    render :json =&gt; @record, :callback =&gt; &#39;updateRecordDisplay&#39;

Can someone explain these?

Rendering JSON in controller

When I am starting rails server using `rails s` command it is showing `A server is already running. Check C:/Sites/folder/Pids/Server.pids`

When I open the file it is outputting a 4 digit number only so how could I resolve this issue ? 

**FYI**

 1. No other instance of Rails cmd is running this time.
 2. Checked Task manager but only `cmd.exe` is showing no else process is running. (using Windows).


Server is already running in Rails

I have the following code in a Rails controller:

    flash.now[:notice] = &#39;Successfully checked in&#39;
    redirect_to check_in_path

Then in the /check_in view:

    &lt;p id=&quot;notice&quot;&gt;&lt;%= notice %&gt;&lt;/p&gt;

However, the notice does not show up. Works perfect if I don&#39;t redirect in the controller:

    flash.now[:notice] = &#39;Successfully checked in&#39;
    render action: &#39;check_in&#39;

I need a redirect though... not just a rendering of that action. Can I have a flash notice after redirecting?

How to display a Rails flash notice upon redirect?

I use RVM, the [Ruby Version Manager](https://rvm.io/) to specify a Ruby version and a set of gems for each of my Rails projects.

I have a `.rvmrc` file to automatically select a Ruby version and gemset whenever I `cd` into a project directory.

After installing RVM 1.19.0, I get a message

&gt; You are using `.rvmrc`, it requires trusting, it is slower and it is
&gt; not compatible with other ruby managers, you can switch to
&gt; `.ruby-version` using `rvm rvmrc to [.]ruby-version` or ignore this
&gt; warnings with `rvm rvmrc warning ignore
&gt; /Users/userName/code/railsapps/rails-prelaunch-signup/.rvmrc`,
&gt; `.rvmrc` will continue to be the default project file in RVM 1 and RVM
&gt; 2, to ignore the warning for all files run `rvm rvmrc warning ignore
&gt; all.rvmrcs`.

Should I continue using my `.rvmrc` file or should I switch to a `.ruby-version` file? Which is optimal? What are the ramifications?


Use rvmrc or ruby-version file to set a project gemset with RVM?

It is easily possible to remove a column using rails migration.


    class SomeClass &lt; ActiveRecord::Migration
      def self.up
        remove_column :table_name, :column_name
      end
    end

I want to know if there is any way to remove a column from table using console.


Content Type	Original Author	Original Content on Stackoverflow
Question	alexs333	View Question on Stackoverflow
Solution 1 - Ruby on-Rails	benilov	View Answer on Stackoverflow
Solution 2 - Ruby on-Rails	Gagan Gami	View Answer on Stackoverflow

Rails emits warning: "Rack::File headers parameter replaces cache_control after Rack 1.5"

Ruby on-Rails Problem Overview

Ruby on-Rails Solutions

Solution 1 - Ruby on-Rails

Solution 2 - Ruby on-Rails

Get name and line of calling function in node.js

How to get margin value of a div in plain JavaScript?

Attributions