state_machine

https://github.com/pluginaweek/state_machine

Ruby

Adds support for creating state machines for attributes on any Ruby class

DeclarativePolicy::Base.rule

Declares a rule, constructed using RuleDsl, and returns
a PolicyDsl which is used for registering the rule with
this class. PolicyDsl will call back into Base.enable_when,
Base.prevent_when, and Base.prevent_all_when.

Source | Google | Stack overflow

Edit

git clone [email protected]:pluginaweek/state_machine.git

cd state_machine

open

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-DeclarativePolicy--Base-rule-for-pr

# Commit to git

git add git commit -m "better docs for DeclarativePolicy::Base.rule"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-DeclarativePolicy--Base-rule-for-pr

hub pull-request

# Celebrate!