ActiveRecord::AttributeMethods::ClassMethods

Allows you to make aliases for attributes. class Person < ActiveRecord::Base alias_attribute :nickname, :name end person = Person.create(name: 'Bob') person.name # => "Bob" person.nickname # => "Bob" The alias can also be used for querying: Person.where(nickname: "Bob") # SELECT "people".* FROM "people" WHERE "people"."name" = "Bob" # File activerecord/lib/active_record/attribute_methods.rb, line

[kiyo_hiko]

フィールドが存在するかどうかの述語attribute_method?(attribute)、フィールド値を取得するのcolumn_for_attribute(name)