One-sided has_and_belongs_to_many relations in Mongoid

20 March 2017 • Categories: mongoid mongodb

Are those commonly used anyways? In a relation database you’d do have a group_members table where-as in our app we store the member_ids on the Group.

class Group
  has_and_belongs_to_many :members, class_name: "User", inverse_of: nil, validate: false
end
class User
  def groups
    Group.where(member_ids: self.id)
  end
end