Question

I wondered that I can call before_create in a model class altough this method is not in the ActiveRecord::Base class. So I learned that this method was mixed in. But the documentation says nothing about mixins.

How can I find out which mixins are included in a Rails class (without looking into the source)?

Answer 1

Usually I use the included_modules method in the rails console.

ruby-1.9.2-p180 :004 > ActiveRecord::Base.included_modules
 => [ActiveRecord::Aggregations, ActiveRecord::Transactions, <<SNIP>>]