I have a Item model that has embedded documents. Currently, the following comments_controller code will add a comment to the item successfully. However, if pushing the comment document onto the comments array on item fails, I will not know this.

  #this does work, but i do not know if the push fails
  def create
    comment = Comment.new(:text => params[:text])
    @item.comments << comment
    render :text => comment
  end

I would like to have something like this, but @item.comments << comment does not return true or false:

  #this does not work
  def create
    comment = Comment.new(:text => params[:text])
    if @item.comments << comment
      render :text => comment
    else
      render :text => 'oh no'
    end
  end

Nor does it throw an exception when the document push fails:

  #this does not work
  def create
    begin
      comment = Comment.new(:text => params[:text])
      @item.comments << comment
      render :text => comment
    rescue Exception => e
      render :text => 'oh no'
    end
  end

Thanks!