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...from prepended modules (Ruby 2.0+ feature) Methods from the object's class Methods from included modules Methods from the class hierarchy (superclass and its ancestors) Example

...have the following class hierarchy: class Superclass def action puts "Superclass" end end module IncludedModule def action puts "Included module" super end end module PrependedModule def action puts "Prepended module...

Using .includes or .eager_load with 1-n associations is dangerous. Always use .preload instead. Consider the following ActiveRecord query: BlogPost.eager_load( :comments :attachments, ).to_a

...the full cross product of the blog post × all its comments × all its attachments, including 1000 redundant copies of all the fields of the blog post. If you add a...