This is done by ensuring that the gems you need are present in the development, staging, and production stages. With these three simple steps that every beginner should know to get your application up and running with bundler :. Before you start, you will need to install Ruby on Rails on your machine. Once the installation is finished run bundle install , this will create Gemfile. This ensures that other developers on your Ruby application run the same third-party code on every machine.
There are multiple options you can use to change the way bundle install works. We will cover the most commonly used ones. A Gemfile is a file we created which is used for describing gem dependencies for Ruby programs. Bundler's defaults are optimized for development. To switch to defaults optimized for deployment and for CI, use the --deployment flag. Do not activate deployment mode on development machines, as it will cause an error when the Gemfile 5 is modified. To ensure that the same versions of the gems you developed with and tested with are also used in deployments, a Gemfile.
This is mainly to ensure that you remember to check your Gemfile. In development, you can modify your Gemfile 5 and re-run bundle install to conservatively update your Gemfile. In deployment, your Gemfile. In development, it's convenient to share the gems used in your application with other applications and other scripts that run on the system.
In deployment, isolation is a more important default. In addition, the user deploying the application may not have permission to install gems to the system, or the web server may not have permission to read them. This may be overridden using the --path option. In some cases, that location may not be writable by your Unix user. In that case, Bundler will stage everything in a temporary directory, then ask you for your sudo password in order to copy the gems into their system location.
You should never use sudo bundle install. This is because several other steps in bundle install must be performed as the current user:.
The third, however, can only be performed by invoking the git command as the current user. As a result, you should run bundle install as the current user, and Bundler will ask for your password if it is needed to put the gems into their final location. By default, bundle install will install all gems in all groups in your Gemfile 5 , except those declared for a different platform.
However, you can explicitly tell Bundler to skip installing certain groups with the --without option. This option takes a space-separated list of groups.
While the --without option will skip installing the gems in the specified groups, it will still download those gems and use them to resolve the dependencies of every gem in your Gemfile 5. This is so that installing a different set of groups on another machine such as a production server will not change the gems and versions that you have already developed and tested against. Bundler offers a rock-solid guarantee that the third-party code you are running in development and testing is also the third-party code you are running in production.
You can choose to exclude some of that code in different environments, but you will never be caught flat-footed by different versions of third-party code being used in different environments. For a simple illustration, consider the following Gemfile 5 :. When you run bundle install --without production in development, we look at the dependencies of rack-perftools-profiler as well.
That way, you do not spend all your time developing against Rack 2. This should not cause any problems in practice, because we do not attempt to install the gems in the excluded groups, and only evaluate as part of the dependency resolution process. This also means that you cannot include different versions of the same gem in different groups, because doing so would result in different sets of dependencies used in development and production.
Because of the vagaries of the dependency resolution process, this usually affects more than the gems you list in your Gemfile 5 , and can surprisingly radically change the gems you are using. In the Bundle Install dialog, click Install to run the bundle install command without any arguments. In this case, Bundler adds the. If you are using a remote Ruby interpreter , RubyMine uses the Gemfile placed on a remote machine to install the gems.
This requires configuring mappings between files of a local and remote project. In the Edit Project Path Mappings dialog, specify the local and remote project root paths:. After you configured mappings, install gems using the Install Gems to Local Interpreter instruction. Note that when you are using a remote interpreter, RubyMine downloads gems from a remote machine to a local cache to be able to use code insight features.
In this case, you may encounter a situation when new gems were installed on a remote machine outside the IDE. You can execute any of these commands in the context of the bundle in the following way:. Select Run Edit Configurations from the main menu. Configure the Run the script in the context of the bundle 'bundle exec' option:. Viewed 4k times. Improve this question.
Add a comment. Active Oldest Votes. These two links explain everything about bundler. How does bundler bundle How does bundle require gems. Improve this answer. Apoorv Parijat Apoorv Parijat 1 1 gold badge 10 10 silver badges 16 16 bronze badges. Think of bundler as a package management tool. No need to run gem install first.
I know we're not supposed to ask follow ups on on stackoverflow according to the FAQ but I have an extended question to this. What I'm really trying to do is manage multiple rails and ruby versions on one machine.
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