Forced to double save

[Bob Sleys]

Ok still working on my Many to Many association.  I'm having a slight problem with the create method in the controller.

Here is the code

  def create

    @space = Space.find_by_id(params[:space][:id])

    hobo_create do

      @this.spaces=[@space]

      @this.building = @space.floor.building

      #@this.save!

      redirect_to @space if valid?

    end

  end

As coded above the spaces get saved to the db fine but the building doesn't.  I must uncomment the @this.save! to get the building to be saved to the db.  Any idea why or how to work around doing a second save to the db?

Note: spaces is the many to many link while the building is the belongs_to side of a one to many link

Bob