Mysql 通过联接表对模型所有权进行Pundit范围界定-Rails 4

我通过一个联接表将用户与给定的公司关联起来，因为我需要能够让每个公司都有一组用户，反之亦然

class User
  has_many :firm_connections, dependent: :destroy
  has_many :firms, through: :firm_connections
end

class FirmConnection
  belongs_to :user
  belongs_to :firm
end

class Firm
  has_many :firm_connections
  has_many :users, through: :firm_connections
end

我的问题是，当一个用户点击公司的索引页面时，我如何确定它的范围以只显示那些用户与什么相关

class FirmPolicy < ApplicationPolicy
  class Scope < Scope
    def resolve
      if user.admin?
        scope.all
      else
        scope.where #only the firms associated with that user
      end
    end
  end

---

这应该对你有用

class Firm
  def index
    @firms = policy_scope(Firm)
  end
end

class FirmPolicy < ApplicationPolicy
  class Scope < Scope
    def resolve
      if user.admin?
        scope.all
      else
        user.firms #only the firms associated with that user
      end
    end
  end
end

但在我看来，这并不那么容易理解

class Firm
  def index
    @firms = policy_scope(Firm)
  end
end

class FirmPolicy < ApplicationPolicy
  class Scope < Scope
    def resolve
      if user.admin?
        scope.all
      else
        user.firms #only the firms associated with that user
      end
    end
  end
end

scope.includes(:firm_connections).where(firm_connections: { user_id: user.id })