model.rb

# lib/templates/active_record/model/model.rb
<% module_namespacing do -%>
class <%= class_name %> < <%= parent_class_name.classify %>
  # keep the default scope first (if any)

  # constants come up next

  # afterwards we put attr related macros

  # followed by association macros
<% attributes.select(&:reference?).each do |attribute| -%>
  belongs_to :<%= attribute.name %><%= ' , polymophic: true' if attribute.polymophic? %><%= ' , required: true' if attribute.required? %>
<% end -%>

  # and validation macros

  # next we have callbacks

  # other mactors (like devise's) should be placed after the callbacks

<% if attributes.any?(&:password_digest?) -%>
  has_secure_password
<% end -%>

 # finaly, scopes
end
<% end -%>

Rails model best practice