为单个用户验证Ruby on Rails中的唯一项目名称

Question

In my model class Project , I wish to create projects with a name . I validate the name like this:

  validates :name, :uniqueness => true

I would like the name for the projects to be unique, only in the scope of a User . Meaning, a user cannot have multiple projects with the same name, but the projects table may contain multiple projects with the same name, owned by different users.

Answer 1

看到范围的独特性

validates :name, :presence => true, :uniqueness => {:scope => :user_id}