What is the difference between bundle install and bundle update

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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. When you run bundle install , Bundler will persist the full names and versions of all gems that you used including dependencies of the gems specified in the Gemfile 5 into a file called Gemfile.

Bundler uses this file in all subsequent calls to bundle install , which guarantees that you always use the same exact code, even as your application moves across machines. Because of the way dependency resolution works, even a seemingly small change for instance, an update to a point-release of a dependency of a gem in your Gemfile 5 can result in radically different gems being needed to satisfy all dependencies.

If you do not, every machine that checks out your repository including your production server will resolve all dependencies again, which will result in different versions of third-party code being used if any of the gems in the Gemfile 5 or any of their dependencies have been updated.

When Bundler first shipped, the Gemfile. Over time, however, it became clear that this practice forces the pain of broken dependencies onto new contributors, while leaving existing contributors potentially unaware of the problem.

Since bundle install is usually the first step towards a contribution, the pain of broken dependencies would discourage new contributors from contributing. As a result, we have revised our guidance for gem authors to now recommend checking in the lock for gems. When you make a change to the Gemfile 5 and then run bundle install , Bundler will update only the gems that you modified. In other words, if a gem that you did not modify worked before you called bundle install , it will continue to use the exact same versions of all dependencies as it used before the update.

Let's take a look at an example. Here's your original Gemfile 5 :. In this case, both actionpack and activemerchant depend on activesupport.

The actionpack gem depends on activesupport 2. When the dependencies are first resolved, Bundler will select activesupport 2. Next, you modify your Gemfile 5 to:. The actionpack 3. When you run bundle install , Bundler notices that you changed the actionpack gem, but not the activemerchant gem.

It evaluates the gems currently being used to satisfy its requirements:. Because you did not explicitly ask to update activemerchant , you would not expect it to suddenly stop working after updating actionpack. However, satisfying the new activesupport 3. Even though activemerchant declares a very loose dependency that theoretically matches activesupport 3. In this case, the activemerchant dependency is treated as activemerchant 1.

To explicitly update actionpack , including its dependencies which other gems in the Gemfile 5 still depend on, run bundle update actionpack see bundle update 1. Summary : In general, after making a change to the Gemfile 5 , you should first try to run bundle install , which will guarantee that no other gem in the Gemfile 5 is impacted by the change.

If that does not work, run bundle update 1. Toggle navigation Bundler. Choose version v2. Options The --clean , --deployment , --frozen , --no-prune , --path , --shebang , --system , --without and --with options are deprecated because they only make sense if they are applied to every subsequent bundle install run automatically and that requires bundler to silently remember them.

This option is deprecated in favor of the clean setting. This option is deprecated in favor of the deployment setting. This option is deprecated in favor of the frozen setting.

The default is 1. This option is deprecated in favor of the path setting. This option is deprecated in favor of the shebang setting. This option is deprecated in favor of the system setting. This option is deprecated in favor of the with setting. This option is deprecated in favor of the without setting. Deployment Mode Bundler's defaults are optimized for development. Should that go in my repo? What's the difference between bundle install and bundle update?

How do I install my gems when I deploy? Where are my pants? You've just created a shiny new Gemfile and specified your app's gems. What is that for? Basically, Gemfile handles the "manages an application's dependencies" part and Gemfile. Here's what happens: when you run bundle install , Bundler installs those gems and records the version number for each one in Gemfile. Now, Bundler has a record of the gem version of each dependency it is managing, and it can now check the gem store against this record when running future commands.

More importantly, if you check out someone else's project and it has a Gemfile. Should you keep your Gemfile. It's a critical part of getting the most benefit from Bundler. By doing so, you guarantee that every developer working on the project and every deployment of the app will use exactly the same third-party code.

How awesome is that? Steve Loveless mentioned in the comments this post by Yehuda Katz that says you should not check-in your Gemfile.

The basic idea is: when developing an app, you want to lock all of your dependencies down so they cannot change, to ensure that if a dependency releases an incompatible update, your app is insulated. However, when developing a gem, you want to be aware of those incompatibilities, so you can resolve them. Also, when developing a gem, you should specify dependencies in your gem's.

Your Gemfile should look like this:. The most common question I've heard about Bundler is about the difference between bundle install and bundle update. In a nutshell: bundle install handles changes to the Gemfile and bundle update upgrades gems that are already managed by Bundler. When you run bundle install , httparty, mocha, and their respective dependencies will be installed. Now, suppose you need to use an older version of mocha.