Question

I was experimenting the polymorphic associaton in Mongoid

class Group
    include Mongoid::Document
    belongs_to :groupable, polymorphic: true
end

class Album
    include Mongoid::Document
    has_many :groups, as: groupable
end

then I decided against it. So I removed all those belongs_to and has_many lines above. Yet in the console, whenever I get a Group record that I experimented with, it still has this “groupable_type” attribute. I know remove_attribute nullify the attribute, but does not remove it( sounds a bit like JavaScript). How can I actually remove this attribute from the database from Mongoid?

Answer 1

You could do this:

Group.collection.update({},
                        {'$unset' => {:groupable_type => 1}},
                        :multi => true)