ruby-on-rails - 如何通过范围关联访问集合？

Question

class User < ActiveRecord::Base
    has_many :assignments
    has_many :projects, through: :assignments
end

class Project < ActiveRecord::Base
    has_many :assignments
    has_many :users, through: :assignments
end

class Assignment < ActiveRecord::Base
    belongs_to :user
    belongs_to :project
    scope :current_assignments, where(...)
end

我想获取当前分配给当前用户的所有项目。就像是：

current_user.current_assigned_projects

但现在，我必须这样做：

current_user.assignments.current_assignments.map{ |a| a.project }.uniq

或者

Project.includes(:users, :assignments).where('assignments.status' => 1, 'users.id' => current_user.id)

有什么漂亮的方法可以做到这一点吗？

Answer 1

就像是

class User < ActiveRecord::Base
   has_many :assignments
   has_many :projects, through: :assignments
   has_many :current_projects, conditions: 'assignments.status = 1', through: :assignments
end

应该管用。或者至少我希望如此；）