    # remove all old versions of the gem
    gem cleanup rjb

    # choose which ones you want to remove
    gem uninstall rjb

    # remove version 1.1.9 only
    gem uninstall rjb --version 1.1.9

    # remove all versions less than 1.3.4
    gem uninstall rjb --version &#39;&lt;1.3.4&#39;

For removing older versions of *all* installed gems, following 2 commands are useful:

     gem cleanup --dryrun

Above command will preview what gems are going to be removed.
&lt;br&gt;&lt;br&gt;

     gem cleanup

Above command will actually remove them.

Way to clean out any old versions of gems.

    sudo gem cleanup

If you just want to see a list of what would be removed you can use:

    sudo gem cleanup -d

You can also cleanup just a specific gem by specifying its name:

    sudo gem cleanup gemname

for remove specific version like 1.1.9 only

    gem uninstall gemname --version 1.1.9

If you still facing some exception to install gem, like:

invalid gem: package is corrupt, exception while verifying: undefined method `size&#39; for nil:NilClass (NoMethodError) in /home/rails/.rvm/gems/ruby-2.1.1@project/cache/nokogiri-1.6.6.2.gem

the, you can remove it from cache:

    rm /home/rails/.rvm/gems/ruby-2.1.1@project/cache/nokogiri-1.6.6.2.gem

For more detail:

[http://blog.grepruby.com/2015/04/way-to-clean-up-gem-or-remove-old.html][1]


  [1]: http://blog.grepruby.com/2015/04/way-to-clean-up-gem-or-remove-old.html

Try something like `gem uninstall rjb --version 1.3.4`.

`gem cleanup` uses system commands. Installed gems are just directories in the filesystem. If you want to batch delete, use `rm -R`.

1. `gem environment` and note the value of `GEM PATHS`
2. `cd &lt;your-gem-paths&gt;/gems`
3. `ls -1 |grep rjb- |xargs rm -R`

You might need to set `GEM_HOME` for the cleanup to work. You can check what paths exist for gemfiles by running:

    gem env

Take note of the GEM PATHS section.

In my case, for example, with gems installed in my user home:

    export GEM_HOME=&quot;~/.gem/ruby/2.4.0&quot;
    gem cleanup

    bundler clean

Stopped the message showing for me, as a last step after I tried all of the above.

My code is as below    

    public CountryStandards()
    {
        InitializeComponent();
        try
        {
            FillPageControls();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message, &quot;Country Standards&quot;, MessageBoxButton.OK, MessageBoxImage.Error);
        }
    }
    
    /// &lt;summary&gt;
    /// Fills the page controls.
    /// &lt;/summary&gt;
    private void FillPageControls()
    {
        popUpProgressBar.IsOpen = true;
        lblProgress.Content = &quot;Loading. Please wait...&quot;;
        progress.IsIndeterminate = true;
        worker = new BackgroundWorker();
        worker.DoWork += new System.ComponentModel.DoWorkEventHandler(worker_DoWork);
        worker.ProgressChanged += new System.ComponentModel.ProgressChangedEventHandler(worker_ProgressChanged);
        worker.WorkerReportsProgress = true;
        worker.WorkerSupportsCancellation = true;
        worker.RunWorkerCompleted += new System.ComponentModel.RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
        worker.RunWorkerAsync();                    
    }
    
    private void worker_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
    {
        GetGridData(null, 0); // filling grid
    }
    
    private void worker_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e)
    {
        progress.Value = e.ProgressPercentage;
    }
    
    private void worker_RunWorkerCompleted(object sender, System.ComponentModel.RunWorkerCompletedEventArgs e)
    {
        worker = null;
        popUpProgressBar.IsOpen = false;
        //filling Region dropdown
        Standards.UDMCountryStandards objUDMCountryStandards = new Standards.UDMCountryStandards();
        objUDMCountryStandards.Operation = &quot;SELECT_REGION&quot;;
        DataSet dsRegionStandards = objStandardsBusinessLayer.GetCountryStandards(objUDMCountryStandards);
        if (!StandardsDefault.IsNullOrEmptyDataTable(dsRegionStandards, 0))
            StandardsDefault.FillComboBox(cmbRegion, dsRegionStandards.Tables[0], &quot;Region&quot;, &quot;RegionId&quot;);
    
        //filling Currency dropdown
        objUDMCountryStandards = new Standards.UDMCountryStandards();
        objUDMCountryStandards.Operation = &quot;SELECT_CURRENCY&quot;;
        DataSet dsCurrencyStandards = objStandardsBusinessLayer.GetCountryStandards(objUDMCountryStandards);
        if (!StandardsDefault.IsNullOrEmptyDataTable(dsCurrencyStandards, 0))
            StandardsDefault.FillComboBox(cmbCurrency, dsCurrencyStandards.Tables[0], &quot;CurrencyName&quot;, &quot;CurrencyId&quot;);
    
        if (Users.UserRole != &quot;Admin&quot;)
            btnSave.IsEnabled = false;
    
    }
    
    /// &lt;summary&gt;
    /// Gets the grid data.
    /// &lt;/summary&gt;
    /// &lt;param name=&quot;sender&quot;&gt;The sender.&lt;/param&gt;
    /// &lt;param name=&quot;pageIndex&quot;&gt;Index of the page.( used in case of paging)   &lt;/pamam&gt;
    private void GetGridData(object sender, int pageIndex)
    {
        Standards.UDMCountryStandards objUDMCountryStandards = new Standards.UDMCountryStandards();
        objUDMCountryStandards.Operation = &quot;SELECT&quot;;
        objUDMCountryStandards.Country = txtSearchCountry.Text.Trim() != string.Empty ? txtSearchCountry.Text : null;
        DataSet dsCountryStandards = objStandardsBusinessLayer.GetCountryStandards(objUDMCountryStandards);
        if (!StandardsDefault.IsNullOrEmptyDataTable(dsCountryStandards, 0) &amp;&amp; (chkbxMarketsSearch.IsChecked == true || chkbxBudgetsSearch.IsChecked == true || chkbxProgramsSearch.IsChecked == true))
        {
            DataTable objDataTable = StandardsDefault.FilterDatatableForModules(dsCountryStandards.Tables[0], &quot;Country&quot;, chkbxMarketsSearch, chkbxBudgetsSearch, chkbxProgramsSearch);
            dgCountryList.ItemsSource = objDataTable.DefaultView;
        }
        else
        {
            MessageBox.Show(&quot;No Records Found&quot;, &quot;Country Standards&quot;, MessageBoxButton.OK, MessageBoxImage.Information);
            btnClear_Click(null, null);
        }
    }

The step `objUDMCountryStandards.Country = txtSearchCountry.Text.Trim() != string.Empty ? txtSearchCountry.Text : null;` in get grid data throws exception 

&gt; The calling thread cannot access this object because a different
&gt; thread owns it.

What&#39;s wrong here?


The calling thread cannot access this object because a different thread owns it

Consider:

    http://example.com/page.html?returnurl=%2Fadmin

For `js` within `page.html`, how can it retrieve `GET` parameters?

For the above simple example, `func(&#39;returnurl&#39;)` should be `/admin`.

But it should also work for complex query strings...





How to retrieve GET parameters from JavaScript

I have several versions of a Ruby gem:

    $ gem list
    rjb (1.3.4, 1.3.3, 1.1.9)

How can I remove old versions but keep the most recent?

Uninstall old versions of Ruby gems

I have several versions of a Ruby gem:
<pre><code class="hljs language-java">$ gem list
rjb (1.3.4, 1.3.3, 1.1.9)
</code></pre>
How can I remove old versions but keep the most recent?

How would I go about checking if a URL exists using Ruby?

For example, for the URL

    https://google.com

the result should be _truthy_, but for the URLs

    https://no.such.domain

or

    https://stackoverflow.com/no/such/path

the result should be _falsey_

Check if URL exists in Ruby

I have a test spec which `describes` a class and within that has various `contexts` each with various `it` blocks.

Is there a way I can disable a `context` temporarily?

I tried adding a `pending &quot;temporarily disabled&quot;` call at the very top within a `context` I want to disable, and I did see something about pending when I ran the spec but then it just continued to run the rest of the tests.

This is what I kind of had:

    describe Something
      context &quot;some tests&quot; do
        it &quot;should blah&quot; do
          true
        end
      end
  
      context &quot;some other tests&quot; do
        pending &quot;temporarily disabled&quot;
    
        it &quot;should do something destructive&quot; do
          blah
        end
      end
    end

but like I said it just went on to run the tests underneath the pending call.

Searching led me to this [mailing list thread](http://www.mail-archive.com/rspec-users@rubyforge.org/msg15297.html) in which the the creator (?) of rspec says it&#39;s possible in rspec 2, which I&#39;m running. I guess it did work but it didn&#39;t have the desired effect of disabling all of the following tests, which is what I think of when I see a `pending` call.

Is there an alternative or am I doing it wrong?

Disable a group of tests in rspec?

Is there any way to detect if `#content_for` was actually applied to a `yield` scope in Rails?

A classic example being something like:

    &lt;title&gt;&lt;%= yield :page_title %&gt;&lt;/title&gt;

If a template doesn&#39;t set that with

    &lt;% content_for :page_title, &quot;Something here&quot; %&gt;

Is there a way to have the layout put something else there instead?

I tried defining it with `#content_for` in the layout itself, but this just causes the text to be doubled-up.  I also tried:

    &lt;%= (yield :page_title) or default_page_title %&gt;

Where `#default_page_title` is a view helper.

This just left the block completely empty.

Rails 3: yield/content_for with some default value?

I have the name of a class and I want to create an instance of that class so that I can loop through each rails attribute that is present in the schema of that class.

How would I go about doing that?

1. I have the name as a string of the class I want to check
2. I guess I need to instantiate a class instance so that I can
3. Loop through it&#39;s attributes and print them.



How do I create a class instance from a string name in ruby?

How do you upgrade from Rails 3 to Rails 3.1 beta?

Upgrading from Rails 3 to Rails 3.1

I&#39;m using [rails_admin](https://github.com/sferik/rails_admin), and since it is in (very) active development, bugs turn up every now and then.

There are no versions for the gem as far as I can tell, for the gem in github, so I can&#39;t use the `:version` key for the gem declaration in the Gemfile .

Is there a way I can &quot;tie&quot; a specific commit(that I know is working fine for me) to the Gemfile ?

I currently have in my Gemfile:

    gem &#39;rails_admin&#39;, 
      :git =&gt; &#39;git://github.com/sferik/rails_admin.git&#39;

I&#39;d like to be able to do something like this (example &quot;commit_id&quot;):

    gem &#39;rails_admin&#39;, 
      :git =&gt; &#39;git://github.com/sferik/rails_admin.git&#39;,
      :commit_id =&gt; &quot;4e7d53e3c5c4c3c5c43c3&quot;

Is this possible to do with github?


How to get a specific &quot;commit&quot; of a gem from github?

    https://github.com/intridea/omniauth.git (at master) is not checked out. Please run `bundle install` (Bundler::GitError)


So what do I do? bundle install works on development, but when I push and deploy to my production server. I get this error, even after running bundle install on my production server.

is not checked out... bundle install does NOT fix help!

When using `gem install gem_name` I can pass `--no-rdoc` and `--no-ri` switches to skip generating RDoc/RI documentation for the gem on install.

Is there a similar way to do this with `bundle install`?

Using --no-rdoc and --no-ri with bundler

When using node package manager you can specify `npm install --save mynodemodule` which automatically pops the module in `package.json`

I was wondering if there is a command for bundler that allows you to add the gem and version to the gemfile from the command line?

For example `bundle install --save nokogiri`

Add gem to gemfile with bundler from command line

I am new to ruby, but while trying to install capybara to run test on my system I get the following error. Im running OSX

    my_app$ gem install capybara-webkit
    Building native extensions.  This could take a while...
    ERROR:  Error installing capybara-webkit:
    ERROR: Failed to build gem native extension.

    /Users/joe/.rvm/rubies/ruby-1.9.2-p290/bin/ruby extconf.rb

    Gem files will remain installed in /Users/joe/.rvm/gems/ruby-1.9.2-p290/gems/capybara-webkit-0.7.2 for inspection.
    Results logged to /Users/joe/.rvm/gems/ruby-1.9.2-p290/gems/capybara-webkit-0.7.2/./gem_make.out

here are results from gem_make.out

    /Users/joe/.rvm/rubies/ruby-1.9.2-p290/bin/ruby extconf.rb





Content Type	Original Author	Original Content on Stackoverflow
Question	Philippe Blayo	View Question on Stackoverflow
Solution 1 - Ruby	Dylan Markow	View Answer on Stackoverflow
Solution 2 - Ruby	ohho	View Answer on Stackoverflow
Solution 3 - Ruby	user3118220	View Answer on Stackoverflow
Solution 4 - Ruby	Daniel O'Hara	View Answer on Stackoverflow
Solution 5 - Ruby	Anatoly	View Answer on Stackoverflow
Solution 6 - Ruby	lkraider	View Answer on Stackoverflow
Solution 7 - Ruby	Mike	View Answer on Stackoverflow

Uninstall old versions of Ruby gems

Ruby Problem Overview

Ruby Solutions

Solution 1 - Ruby

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How to retrieve GET parameters from JavaScript

The calling thread cannot access this object because a different thread owns it

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