module ActiveRecord::AttributeMethods::ClassMethods

Person.has_attribute?(:nothing) # => false
Person.has_attribute?(:age) # => true
Person.has_attribute?('new_name') # => true
Person.has_attribute?('name') # => true

end
alias_attribute :new_name, :name
class Person < ActiveRecord::Base

Returns true if the given attribute exists, otherwise false.

def has_attribute?(attr_name)
  attr_name = attr_name.to_s
  attr_name = attribute_aliases[attr_name] || attr_name
  attribute_types.key?(attr_name)
end