class RuboCop::Cop::Rails::ReflectionClassName

has_many :accounts, class_name: ‘Account’
# good
has_many :accounts, class_name: Account.name
has_many :accounts, class_name: Account
# bad
@example
the definition of a reflection is a string.
This cop checks if the value of the option ‘class_name`, in

def on_send(node) 

def on_send(node)
  return unless association_with_options?(node)
  reflection_class_name = reflection_class_name(node).first
  return unless reflection_class_name
  add_offense(node, location: reflection_class_name.loc.expression)
end