Question

in previous released of Mongoid (2.0.beta.20), I could pass a class type as the
2nd parameter of the .find_or_create_by block on embedded document collections.
this doesn’t appear to be the case any more, with v2.0.1, yet I still
need to do polymorphic find_or_create_by. any suggestions / pointers
on how to do this?

I used to do this:


SomeClass.childclass.find_or_create_by({:key => "value"},
InheritingChildClass)


now I get an exception saying too many arguments (2 for 1)
on .find_or_create_by.

how can I tell the collection to create an object of the correct type, when using find_or_create_by? Or, how can i create my own method that will be functionaly equivalent to what I want, and be re-usable across my embedded document collections?

any help is appreciated.

thanks.

Answer 1

I ended up rolling my own solution for this

module Mongoid::Relations
  class Many
    def find_or_new(attrs, type, &block)
      inst = self.where(attrs).first

      unless inst
        inst = type.new
        inst.write_attributes attrs
        self << inst
      end

      inst
    end
  end
end