Setler
Setler is a Gem that lets one easily implement the “Feature Flags” pattern, or add settings to individual models. This is a cleanroom implementation of what the ‘rails-settings’ gem does. It’s been forked all over the place, and my favorite version of it doesn’t have any tests and doesn’t work with settings associated with models.
Setup
Install the gem by adding this to your Gemfile:
gem "setler"
Generate the model:
rails g setler <model_name>
Run the migration:
rake db:migrate
Usage
Create/Update settings:
# Method calls and []= are synonymous
Featureflags.bacon_dispenser_enabled = true
Settings[:allowed_meats] = ['bacon', 'crunchy bacon']
Read settings:
Featureflags.bacon_dispenser_enabled # true
Settings[:allowed_meats].include?('bacon') # true
Destroy them:
Featureflags.destroy :bacon_dispenser_enabled
Settings.destroy :allowed_meats
List all:
Featureflags.all
Settings.all
Set defaults in an initializer with something like:
Featureflags.defaults[:bacon_dispenser_enabled] = false
Settings.defaults[:allowed_meats] = ['itsnotbacon']
To revert to the default after changing a setting, destroy it. Note: Updating the setting to nil or false no longer makes it the default setting (> 0.0.6), but changes the setting to nil or false.
Add them to any ActiveRecord object:
class User < ActiveRecord::Base
has_setler as: :settings
end
Then you get:
user = User.first
user.settings.favorite_meat = :bacon
user.settings.favorite_meat # :bacon
user.settings.all # { "favorite_meat" => :bacon }
TODO: And look em up:
User.with_settings_for('favorite_meat') # => scope of users with the favorite_meat setting
Gem Development
Getting started is pretty straightforward:
1. Check out the code: `git clone git://github.com/ckdake/setler.git`
2. Bundle install: `bundle install`
3. Run the tests and make sure they all pass and code coverage is still 100%: `rake test`
If you’d like to contribute code, make your changes and submit a pull request that includes appropriate tests
For building the gem: ‘rake build` and to release a gem to github and Rubygems: `rake release`