state_machine

https://github.com/pluginaweek/state_machine

Ruby

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

StateMachine::NodeCollection#context

Tracks a context that should be evaluated for any nodes that get added
which match the given set of nodes.  Matchers can be used so that the
context can get added once and evaluated after multiple adds.

Source | Google | Stack overflow

Edit

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

cd state_machine

open lib/state_machine/node_collection.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-StateMachine--NodeCollection-context-for-pr

# Commit to git

git add lib/state_machine/node_collection.rbgit commit -m "better docs for StateMachine::NodeCollection#context"

# Open pull request

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

hub fork

git push <your name> -your-name--update-docs-StateMachine--NodeCollection-context-for-pr

hub pull-request

# Celebrate!