Question

I have a users model and a companies model. Many users to many companies. This works great for normal users. It’s not so great for users with admin abilities. Admins need to see all companies. I’d rather not have to assign all companies to the admins.

Currently, I’m using methods inside my model like so:

class Company
  def self.for_user
    if User.current.is_admin?
       Company.all
    else
       User.companies
    end
  end
end

Is there a way to make the has_and_belongs_to_many relationship contingent on a condition?

Answer 1

thanks to this question/answer, I figured it out

Modify the behavior of has_many or use scope?

so, my association becomes

class User
  has_and_belongs_to_many :companies do
    def visible
      if proxy_owner.can? "company:view_all"
        Company.scoped
      else
        self
      end
    end
  end
end

Then you can call it with

User.find(x).companies.visible