where.not

使用 where.not 語法可以取消 where 子句：

class Person < ApplicationRecord
  #attribute :first_name, :string
end

people = Person.where.not(first_name: ['Mark', 'Mary'])
# => SELECT "people".* FROM "people" WHERE "people"."first_name" NOT IN ('Mark', 'Mary')

由 ActiveRecord 4.0 及更高版本支援。