ruby-on-rails - 你能通过三个属性找到吗？

Question

在 Rails 中是否允许这种类型的东西:Model.find_by_X_and_Y_and_Z(attribute1, attribute2, attribute3)

Answer 1

来自 http://ar.rubyonrails.org/classes/ActiveRecord/Base.html

It‘s also possible to use multiple attributes in the same find by separating them with "and", so you get finders like Person.find_by_user_name_and_password or even Payment.find_by_purchaser_and_state_and_country. So instead of writing Person.find(:first, :conditions => ["user_name = ? AND password = ?", user_name, password]), you just do Person.find_by_user_name_and_password(user_name, password).