dotenv-missing_variable_notifier is a tiny (literally 6 lines of code) extension for dotenv to notify you if your development environment is missing any environment variables listed in the example dotenv file in your Rails application. This is useful for projects that use an example file for their environment variables (usually .env.template or .env.example), which is most projects that use dotenv. Now you won't need to check for new environment variables after you do a git pull!

Add the gem to your Gemfile after dotenv-rails.

group :development, :test do
  gem 'dotenv-rails'
  gem 'dotenv-missing_variable_notifier', '~> 1.0'
end

And then install:

bundle install

dotenv-missing_variable_notifier is basically a tiny Railtie that runs in a before_configuration callback while your application is booting. If it runs before dotenv does then it will complain that every environment variable is missing, and it would be right! This means that you must list dotenv-missing_variable_notifier in your Gemfile after dotenv-rails.

Bug reports and pull requests are welcome on GitHub at https://github.com/GlenCrawford/dotenv-missing_variable_notifier.

A huge thanks to the author(s) of dotenv for their amazing gem.

The gem is available as open source under the terms of the MIT License.