What is my Gemfile?
Gemfile is a file which must be located in root of your rails project. It is used for describing gem dependencies for Ruby programs. The first thing in your gemfile is a source in which you tell the Gemfile where to look for gems. Source can be called as a block and you can have multiple sources in your gemfile.
Should I specify Ruby version in Gemfile?
You can use the ruby keyword in your app’s Gemfile to specify a specific version of Ruby. Heroku recommends you run the latest Ruby version your app can handle. Ruby 2.5. 1 might not be the latest Ruby version, and is here for demonstration purposes only.
What is the difference between Gemfile and Gemfile lock?
The Gemfile is where you specify which gems you want to use, and lets you specify which versions. The Gemfile. lock file is where Bundler records the exact versions that were installed. This way, when the same library/project is loaded on another machine, running bundle install will look at the Gemfile.
How do I create a Gemfile?
A gemfile is automatically created when you start a new rails application. type rails new appName and then it will be generated automatically. It will also be populated with some gems.
What are groups in Gemfile?
Since version 0.9, Bundler has had a feature called “groups”. The purpose of this feature is to allow you to specify groups of dependencies which may be used in certain situations, but not in others. Specifying groups allows you to do two things. First, you can install the gems in your Gemfile, minus specific groups.
How do I remove gem from Gemfile lock?
You can run just bundle or bundle install to install gems based on your Gemfile. That will remove the instance of mygem from your Gemfile. lock file.
What version of Gemfile do I Have my rails on?
You have an unlocked gem “rails” in your gemfile and the version in Gemfile.lock is 4.1.16. You are coding along and at some point you do a bundle update.
Should I specify the version of a gem by major version?
Bookmark this question. Show activity on this post. I’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 gem “haml-rails”, “~> 0.3.4” # “$ bundle install” will acquire the # latest version before 1.0.
How to update dependencies/update gem versions?
To update dependencies / update gem versions, you then have to explicitly do a bundle update, which will update your Gemfile.lock file. If there wasn’t a Gemfile.lock, deploying code to production would be a major issue because, as you mention, the dependencies and gem versions could change.
How to update Gemfile lock file?
This is the purpose of the Gemfile.lock file – running bundle install with a Gemfile.lock present only installs using the dependencies listed in there; it doesn’t re-resolve the Gemfile. To update dependencies / update gem versions, you then have to explicitly do a bundle update, which will update your Gemfile.lock file.