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POMake bundler use different gems for different platforms
 

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    <p>I'm working on upgrading one of our Rails 2.3.8 apps to Rails 3, and have run into an annoying problem with bundler and deployment. I develop the application on a Windows machine, but the production environment is running Ubuntu Linux. Now, my problem is that bundler is ignoring the <code>mysql</code> gem in the production environment, and Passenger spits out: <strong>"!!! Missing the mysql gem. Add it to your Gemfile: gem 'mysql', '2.8.1'"</strong></p> <p>Here is my <code>Gemfile</code>:</p> <pre><code># Edit this Gemfile to bundle your application's dependencies. # This preamble is the current preamble for Rails 3 apps; edit as needed. source 'http://rubygems.org' gem 'rails', '3.0.0' gem 'net-ldap', :require =&gt; 'net/ldap' gem 'highline', :require =&gt; 'highline/import' gem 'mysql', '2.8.1' gem 'net-ssh', :require =&gt; 'net/ssh' # Bundle gems for the local environment. Make sure to # put test-only gems in this group so their generators # and rake tasks are available in development mode: group :development, :test do gem 'fakeweb', :require =&gt; 'fakeweb' gem 'flexmock', :require =&gt; 'flexmock/test_unit' end </code></pre> <p>As you can see, the <code>mysql</code> gem is specified. However, when deploying, bundler ignores it. Why? The reason is that Bundler generates the following <code>Gemfile.lock</code> (only relevant parts included):</p> <pre><code>.... mime-types (1.16) mysql (2.8.1-x86-mingw32) net-ldap (0.1.1) .... </code></pre> <p>Notice that it includes the platform specific gem. This is obviously NOT what I want it to do, as that gem is not suitable (and appearently ignored) when running under Linux.</p> <p>So, does Bundler come with any way to deal with these issues? Or do I have to remember to manually change the mysql gem version in the generated <code>Gemfile.lock</code> every time I run bundle install on my development machine?</p> <p>Thank you in advance!</p> <p><strong>Update</strong></p> <p>It seems like the bundler team is aware of this <a href="https://github.com/carlhuda/bundler/issues#issue/635" rel="noreferrer">issue</a>.</p>
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    1. COI have a similar issue, I need to use rmagick 2.12.0 on windows, but the current version on any other ruby platform. Bundler errors out if I try to lost rmagick twice.
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    2. COPlease try add the mysql (2.8.1) to Gemfile.lock, manually. In our Gemfile.lock, we have `sqlite3-ruby (1.3.1)` _and_ `sqlite3-ruby (1.3.1-x86-mingw32)`
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    3. COMorten, this is in fact what I do today. Unfortunately, Bundler removes the "original" mysql row (and only keeps the Windows version) when bundle install is run.
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