def create
      set_post_from_post_id
      set_comment_as_new
      comment.save
      yield comment if block_given?
      respond_to do |format|
        format.js   { create_respond_to_js }
        format.html { create_respond_to_html }
      end
    end
def create
      set_post_from_post_id
      set_comment_as_new
      comment.save
      yield comment if block_given?
      respond_to do |format|
        format.js   { create_respond_to_js }
        format.html { create_respond_to_html }
      end
    end
Handles POST requests to /blogit/comments.html and /blogit/comments.js

 Yields #comment if called with a block (useful for calling super from subclasses)