Rails model best practice

rails_model_bes_practice.rb

# Extends ...................................................................
# Includes ..................................................................
# Variables .................................................................
# Fields (If use mongo) .....................................................
# Relationships .............................................................
# Validations ...............................................................
# Callbacks .................................................................
# Scopes ....................................................................
# Uploaders .................................................................
# Additional config (i.e. accepts_nested_attributes_for etc...) .............
# Auditeds ..................................................................
# Enums .....................................................................
# Delegate ..................................................................