How do you 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.
How is Gemfile lock created?
The Ruby platform the Gemfile. lock was generated against. If any dependencies in the Gemfile specify a platform then they will only be included in the Gemfile. lock when the lockfile is generated on that platform (e.g., through an install).
How do I specify a Gemfile version?
There are several ways to specify gem versions: Use a specific version: gem “name-of-gem”, “1.0” . You can find specific versions on Rubygems.org (provided that’s the source you”re using) by searching for your gem and looking at the “Versions” listed. Use a version operator: gem “name-of-gem”, “>1.0” .
What is Gemfile?
A Gemfile is a file we create which is used for describing gem dependencies for Ruby programs. A gem is a collection of Ruby code that we can extract into a “collection” which we can call later. It lets you specify which gems you want to use, and which versions of these gems to use.
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.
Where is Gemfile located?
A Gemfile is a file we created which is used for describing gem dependencies for Ruby programs. The Gemfile is located in the root of the project directory.
Can we edit Gemfile lock?
lock as long as Gemfile isn’t changed.
How does a Gemfile work?
Your gemfile is a list of all gems that you want to include in the project. It is used with bundler (also a gem) to install, update, remove and otherwise manage your used gems. These gems belong to development environment and the test environment since they are for testing the application.
Should I specify version in Gemfile?
In short, you should be generally safe using the pessimistic version constraint operator ( ~> ) as rubygems.org advises. Just be sure to re-run your tests after you do a bundle update to make sure nothing breaks. There’s a nice article by Yehuda Katz that has a little more info on Gemfile.
What is 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.
Where is my Gemfile?
What is require false in Gemfile?
so you put :require => false in your Gemfile for these Gems, this way bundler will install that Gem but not load code for that Gem itself, you can do it whenever you want by simply putting like require ‘whenever’ in your case.
Where do I put the Gemfile in rails?
A Gemfile describes the gem dependencies required to execute associated Ruby code. Place the Gemfile in the root of the directory containing the associated code. For instance, in a Rails application, place the Gemfile in the same directory as the Rakefile.
How is a Gemfile evaluated in Ruby code?
A Gemfile is evaluated as Ruby code, in a context which makes available a number of methods used to describe the gem requirements. At the top of the Gemfile, add a line for the Rubygems source that contains the gems listed in the Gemfile.
How can I use multiple gems in one file?
If you would like to use multiple local gems directly from the filesystem, you can set a global `path` option to the path containing the gem’s files. This will automatically load gemspec files from subdirectories. Dependencies can be placed into groups.
Which is the default syntax for a gem?
Gems default syntax is: gem ‘gem_name’. You can improve the default syntax in the following way: If you don’t set a gem version, bundler will set it for you.