How to Use Gems Not in a Gemfile When Working with Bundler

How to use gems not in a Gemfile when working with bundler?

I assume that none of these answers have been chosen as correct because they don't do a great job of solving the problem: having additional gems that you can use that by default don't require any changes to files already in the repository to achieve. That is, you don't have to modify any files, and you don't have to live with remembering not to check in your local changes. Here's how I do it.

The idea is basically inverting the dependencies of Holger's answer, such that there's no need to modify the shared Gemfile. Bundler allows one to specify which file is to be used as the gemfile, but strangely the documented methods do not apparently work with its configuration file and will not be fixed. There is a somewhat obscured feature of Bundler that any of the configuration options can be set in an environment variable or passed on the command line. Running all of your commands as bundle [command] --gemfile [yourgemfile] or BUNDLE_GEMFILE="[yourgemfile]" bundle [command] will cause Bundler to read whatever gemfile you want it to. I highly recommend using the environment variable approach, and either creating an alias or exporting the variable for your current session, particularly as I was unable to use the command line switch with the "exec" command.

Therefore, I run rspec like this: BUNDLE_GEMFILE="[mygemfile]" bundle exec rspec [filename], and I have the first part of this aliased as bem in my bashrc. Works like a charm.

Then, you should setup your source control to ignore your Gemfile, either in the project's .gitignore or, to keep the project entirely hygienic without changing even its .gitignore, to your personal global ignore file (which is by default in ~/.config/git/ignore and has the same format as a project's gitignore file).

One other thing to note is that Bundler will create a lockfile based on the Gemfile's name. This is super handy, as it keeps you from overwriting your project's Gemfile.lock if it's checked in, but you need to ignore this new lock file as well. If your gemfile is Foo.bar, look for Foo.bar.lock.

Finally, you can do something similar to Holger's suggestion in your custom Gemfile:

source "http://rubygems.org"
gem "fivemat"
instance_eval(File.read(File.dirname(__FILE__) + "/Gemfile"))

and you're good to go, as long as you remember to specify your Gemfile.

How to use Bundler with offline .gem file?

I'm using Rails 3.0.3, new to Rails 3 and bundler.

I got this same error with:

gem 'mygem', :path => '/path/to/gem'

Resolved by specifying the version number:

gem 'mygem', '0.0.1', :path => '/path/to/gem'

Using >=0.0.1 for the version reverted to the original error. I can't explain any of this, however.

Quoting JD's helpful commment, from the Gemfile man page: "Similar to the semantics of the :git option, the :path option requires that the directory in question either contains a .gemspec for the gem, or that you specify an explicit version that bundler should use."

Related Topics