将sql结果集传递给另一个sqlquery rails

我正在尝试获取连接到项目的用户的详细信息

@users=UserProject.find(:all,:conditions => ["project_id=?",@project.id],:select=> "DISTINCT user_id")

@user_details=User.find(@users)

---

但是如果找不到ID为{some garbage}

的用户，那么使用AR更容易：

project.rb：

class Project < ActiveRecord::Base
  has_many :user_projects
  has_many :users, through: :user_projects
  # ...
end

class UserProject < ActiveRecord::Base
  belongs_to :user
  belongs_to :project
  # ...
end

读这里

@users = @project.users