**New way**

Use the `uninstall` command: `rbenv uninstall [-f|--force] &lt;version&gt;`

    rbenv uninstall 2.1.0  # Uninstall Ruby 2.1.0

Use `rbenv versions` to see which versions you have installed.

---

**Old way**

To remove a Ruby version from rbenv, delete the corresponding directory in `~/.rbenv/versions`. E.g.

    rm -rf ~/.rbenv/versions/1.9.3-p0

Run `rbenv rehash` afterwards to clean up any stale shimmed binaries from the removed version.

ruby-build now adds an [uninstall command](https://github.com/sstephenson/rbenv#uninstalling-ruby-versions) to rbenv to handle the removal of ruby versions, if you want to avoid manual `rm -fr` (which might be considered risky) and `rbenv rehash` suggested by @Stephenson. For removing ruby version 1.9.3-p0 you would run the following:

    rbenv uninstall 1.9.3-p0

Like Stephenson said, but remember to change version &amp; global if they are referencing the deleted version.

The correct command is well explained in other answers, However if you are trying to uninstall jruby then you need to explicitly mention `jruby` in command followed by hyphen and then gem version, For example:

`rbenv uninstall jruby-9.2.16.0`

I get this error when I try to change branch.

Probably I will give some information of the commands at 

    /path/to/git/repo/.

upon command:

    git branch

I get following output

    * V1.5
      V2.0
      master

And when I try the command 

    git checkout V2.0

I get following output:

    fatal: This operation must be run in a work tree

config file contents:


    cat config 
    [core]
            repositoryformatversion = 0
            filemode = true
            bare = true
    [remote &quot;origin&quot;]
            url = /path/to/git/repo/.git

fatal: This operation must be run in a work tree

The two types of objects seem to be so close to one another that having both feels redundant. What is the point of having *both* schemas and models?

Why does Mongoose have both schemas and models?

How to uninstall or remove ruby version from [rbenv][1]. I have installed two versions of ruby. While switching to ruby 1.9.3, I am getting segmentation fault. Can anyone please help, how to remove a particular version from rbenv?


  [1]: https://github.com/rbenv/rbenv

uninstall ruby version from rbenv

<p>How to uninstall or remove ruby version from <a href="https://github.com/rbenv/rbenv" target="_blank" rel="noopener noreferrer">rbenv</a>. I have installed two versions of ruby. While switching to ruby 1.9.3, I am getting segmentation fault. Can anyone please help, how to remove a particular version from rbenv?</p>


This is my first time trying to use the XMLRPC::Client library to interact with a remote API and I keep receiving this error:

    warning: peer certificate won&#39;t be verified in this SSL session

Searching around I&#39;ve found loads of people that have gotten that error. Usually it&#39;s with self-signed certificates and they just want it to go away, so they do something dirty like monkey patch the way XMLRPC::Client is opening it&#39;s http session.

I first assumed this was simply the client not caring whether the certificate was valid or not, so I continued my search and came across [this gem][1]. It simply forces verification of all SSL certificates and throws a hard error if it&#39;s not able too. This was exactly what I wanted. I included it, ran the code again and now I&#39;m getting this:

    OpenSSL:SSL::SSLError:
      SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B:
      certificate verify failed

Of course! The certificate is bad! But I double check just to make sure with openssl&#39;s builtin s_client like so:

    openssl s_client -connect sub.example.com:443

and what do I get:

    CONNECTED(00000003)
    ---
    Certificate chain
    &lt;snip&gt;
    Verify return code: 0 (ok)

So now we get to my question. OpenSSL (the command line version) says the certificate is good. OpenSSL (the Ruby library) disagrees. All of my web browsers say the certificate is good.

A few additional details that might be of use. The certificate is a wildcard but is valid for the domain. The openssl s_client was run on the same machine seconds apart from the Ruby code. This is Ruby 1.8.7 p357 which is installed with RVM.

Does Ruby use something other than the CA bundle provided by the host OS? Is there a way to tell Ruby to use a specific CA bundle or the system one?


  [1]: https://github.com/jamesgolick/always_verify_ssl_certificates

Why is Ruby unable to verify an SSL certificate?

I&#39;m uploading a file to the server in Ruby on Rails

Normally, it&#39;s a text file and I save it in the model as a &#39;file&#39; field in a Submission ActiveRecord with other fields such as title of submission.. etc.

However, the user can also submit a zip file. In this case the zipfile should unzipped and for each file in the zip a new Submission should be created with the same text fields, but current file.

How can I accomplish this?

I looked at unzip examples on the net, but most use a directory to unzip the files to. I&#39;m not sure if I need that as in the current create method of SubmissionsController, a file object is received and I presume the path to save the file to is automatically generated when the Submission save method is called. So I was thinking that maybe I should unzip the zipfile in memory to get an array of file objects and then create a new Submission with each file object but same fields and then let ActiveRecord generate the file paths for each one when it saves them to the database.
I might be wrong here, because I&#39;m kind of new to Rails and Ruby.

How to unzip a file in Ruby on Rails?

New to Ruby and ROR and loving it each day, so here is my question since I have not idea how to google it (and I have tried :) )

we have method

    def foo(first_name, last_name, age, sex, is_plumber)
        # some code
        # error happens here
        logger.error &quot;Method has failed, here are all method arguments #{SOMETHING}&quot;    
    end

So what I am looking for way to get all arguments passed to method, without listing each one. Since this is Ruby I assume there is a way :) if it was java I would just list them :)

Output would be:

    Method has failed, here are all method arguments {&quot;Mario&quot;, &quot;Super&quot;, 40, true, true}



Is there a way to access method arguments in Ruby?

I&#39;ve noticed that on rubygems.org a lot of the gems suggest you specify them by major version rather than exact version. For example...

[The haml-rails gem][1]...

    gem &quot;haml-rails&quot;, &quot;~&gt; 0.3.4&quot;  # &quot;$ bundle install&quot; will acquire the 
                                  # latest version before 1.0.

However, based on the [Bundler docs][2] it sounded to me like it would be better to nail down the exact version like this...

    gem &quot;haml-rails&quot;, &quot;0.3.4&quot;

So there&#39;s your haml-rails gem and all its dependencies won&#39;t drift forward. If you check out the project on a different machine a few weeks later and run `$ bundle install` you&#39;ll have precisely the same versions of everything you specified.

I&#39;ve seen point releases break stuff, and I thought part of the whole idea of Bundler was to &quot;`Bundle.lock`&quot; all your gem versions.

But on rubygems.org they use &quot;~&gt;&quot; a lot so maybe I&#39;m missing something?

Any clarification would be very helpful to me in understanding Bundler and gem management.


  [1]: http://rubygems.org/gems/haml-rails
  [2]: https://bundler.io/guides/using_bundler_in_applications.html#adding-gems

Should I specify exact versions in my Gemfile?

I have this hash:

     h
     =&gt; {&quot;67676.mpa&quot;=&gt;{:link=&gt;&quot;pool/sdafdsaff&quot;, :size=&gt;4556}} 

	&gt;  h.each do |key, value|
	&gt;     puts key
	&gt;   puts value
	&gt;   end
	67676.mpa
	linkpool/sdafdsaffsize4556

How do I access the separate values in the value hash on the loop?

How do I loop over a hash of hashes?

I am interested in how RVM and rbenv actually work.

Obviously they swap between different versions of Ruby and gemsets, but how is this achieved? I had assumed they were simply updating symlinks, but having delved into the code (and I must admit my knowledge of Bash is superficial) they appear to be doing more than this.


How do RVM and rbenv actually work?

I installed rbenv according to the github directions. I am running OSX but I have tried this on a Ubuntu 12.04 VM and got the same results. The following is what i get in my terminal when I try to change ruby versions:

    rbenv versions
    * 1.9.3-p0 (set by /Users/user/.rbenv/version)
    1.9.3-p125

    rbenv global
    1.9.3-p0

    rbenv rehash

    ruby -v
    ruby 1.8.7 (2011-12-28 patchlevel 357) [universal-darwin11.0]

    which ruby
    /usr/bin/ruby

Anyone have any ideas as to why rbenv isn&#39;t switching the ruby version like it thinks it is? Also there is no .rbenv file in the local directory that would be causing the ruby version to default to 1.8.7

    rbenv local
    rbenv: no local version configured for this directory




 

rbenv not changing ruby version

I cannot execute `rails console` due to this error:

    localhost:TwitterForZombies wiz$ rails c
    /Users/wiz/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/irb/completion.rb:9:in `require&#39;: dlopen(/Users/wiz/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/x86_64-darwin12.2.1/readline.bundle, 9): Library not loaded: /usr/local/opt/readline/lib/libreadline.6.2.dylib (LoadError)
      Referenced from: /Users/wiz/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/x86_64-darwin12.2.1/readline.bundle
      Reason: image not found - /Users/wiz/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/x86_64-darwin12.2.1/readline.bundle
    	from /Users/wiz/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/irb/completion.rb:9:in `&lt;top (required)&gt;&#39;
    	from /Users/wiz/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/railties-3.2.9/lib/rails/commands/console.rb:3:in `require&#39;
    	from /Users/wiz/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/railties-3.2.9/lib/rails/commands/console.rb:3:in `&lt;top (required)&gt;&#39;
    	from /Users/wiz/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/railties-3.2.9/lib/rails/commands.rb:38:in `require&#39;
    	from /Users/wiz/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/railties-3.2.9/lib/rails/commands.rb:38:in `&lt;top (required)&gt;&#39;
    	from script/rails:6:in `require&#39;
    	from script/rails:6:in `&lt;main&gt;&#39;


I have installed readline via homebrew.
I&#39;d like to keep using rbenv instead of rvm. 

Thank you for reading my question.


Cannot execute &quot;rails console&quot; due to an error with readline

In `Ubuntu 10.04` I just installed `rbenv`.
The install command is not present.

    rbenv 0.4.0-49-g8b04303
    Usage: rbenv &lt;command&gt; [&lt;args&gt;]
    
    Some useful rbenv commands are:
       commands    List all available rbenv commands
       local       Set or show the local application-specific Ruby version
       global      Set or show the global Ruby version
       shell       Set or show the shell-specific Ruby version
       rehash      Rehash rbenv shims (run this after installing executables)
       version     Show the current Ruby version and its origin
       versions    List all Ruby versions available to rbenv
       which       Display the full path to an executable
       whence      List all Ruby versions that contain the given executable
    
    See `rbenv help &lt;command&gt;&#39; for information on a specific command.
    For full documentation, see: https://github.com/sstephenson/rbenv#readme

What am I missing?

The command rbenv install is missing

I&#39;m new-ish to Ruby and Rails.  I am looking for a purely objective list of features and advantages/disadvantages of each.  In an effort to keep preference out of this, please refrain from answering unless you have used all 3 systems. 

Content Type	Original Author	Original Content on Stackoverflow
Question	Thillai Narayanan	View Question on Stackoverflow
Solution 1 - Ruby	Sam Stephenson	View Answer on Stackoverflow
Solution 2 - Ruby	lorcan	View Answer on Stackoverflow
Solution 3 - Ruby	Mauricio Pasquier Juan	View Answer on Stackoverflow
Solution 4 - Ruby	Hardik	View Answer on Stackoverflow

uninstall ruby version from rbenv

Ruby Problem Overview

Ruby Solutions

Solution 1 - Ruby

Solution 2 - Ruby

Solution 3 - Ruby

Solution 4 - Ruby

Why does Mongoose have both schemas and models?

fatal: This operation must be run in a work tree

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