attopartners / envyable

The simplest yaml to ENV config loader.

Envyable

The simplest yaml to ENV config loader.

Installation

Add this line to your application's Gemfile:

gem 'envyable'

And then execute:

$ bundle

Or install it yourself as:

$ gem install envyable

Install task

Once the gem is included in your project, you can then use it to generate the default required files. Just run:

$ envyable install

and you will get a config directory containing an env.yml and a env.yml.example file. If you have a .gitignore file this will also append the line:

/config/env.yml

to your config so that you do not check in /config/env.yml.

If you have Spring bundled with your application this will append the following line to /config/spring.rb:

Spring.watch 'config/env.yml'

If the file /config/spring.rb does not exist, it will be created.

Usage

YAML file

Create a yaml file that holds your settings. You can put default settings into the root of the yaml file and then override those on an environment by environment basis. For example, the following yaml file will load the id "development-id" into all environments it is loaded in except for the test environment, where the id would be "test-id".

API_CLIENT_ID: development-id
test:
  API_CLIENT_ID: test-id

Rails

Once installed in a Rails app, add your yaml file at config/env.yml. The gem will load the correct environment on initialization of the application. If you are using Spring to load your Rails application, add config/env.yml to Spring's watch list.

Load Immediately

If you have gems that require variables to be set earlier then place envyable in the Gemfile before those gems and require envyable/rails-now:

gem 'envyable', require: 'envyable/rails-now'
gem 'other-gem-that-requires-env-variables'

Other applications

With the exception of loading Envyable immediately via the Gemfile, you can create your yaml file anywhere (though why not config/env.yml?). To load your yaml file into ENV, call:

Envyable.load('path/to/yml', environment)

The default environment is development if you leave that argument blank. For example, if your variables are in a config folder in a file called env.yml, and you want to load development only, include in your script:

require 'envyable'
Envyable.load('config/env.yml')

Version control

It is not recommended that you check the yaml file in to version control. Personally, I like to check in a env.yml.example file that shows the required keys, but does not include any credentials. If you generate your Envyable files using the installer, config/env.yml will be added to your .gitignore file.

Troubleshooting

If your ENV values don't update when you modify config/env.yml, verify whether you have Spring (or another application preloader) that isn't configured to watch and reload when you update values. You should try configuring the preloader or just restarting it.

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request