AutoDemeter is an automated delegator to associations. The name comes from the rule of demeter is a mechanism to try to prevent the bad things that happen when that rule is violated.
It's a little like the new &. (praying dot), but also works with older versions of Ruby.
It was created after spending hours refactoring lots of ancient code that reached through models and associations with little regard for the fact that there could be a nil somewhere which would make the whole thing blow up and the fact that I hated the alternative of checking nil manually at every point whilst on the route to refactoring properly.
Add this line to your application's Gemfile:
gem 'auto_demeter'
And then execute:
$ bundle
Or install it yourself as:
$ gem install auto_demeter
You can replace things like:
@object.user.manager.name
with
@object.user_manager_name
and rather than blowing up when user or manager return nil, the method itself will return nil.
It also let's you do things like:
@object.users.map(&:manager_name)
without having to define manager_name on the association.
- Fork it
- Create your feature branch (
git checkout -b my-new-feature) - Commit your changes (
git commit -am 'Add some feature') - Push to the branch (
git push origin my-new-feature) - Create new Pull Request