gistfile1.txt

263   def create_links
264     old_links = self.links.clone
265     new_links = self.content.scan(LINK_REGEXP)
266     new_links.each do |link_result|
267       if current_link =  create_or_update_link link_result.first
268         old_links.delete(current_link)
269       end
270     end 
271     
272     old_links.each do |old_link|
273       old_link.destroy
274     end
275   end
276   
277   def create_or_update_link raw_link_text
278     link_body = Link.safe_link_text(raw_link_text) 
279     url_attr = Link.is_short_url?(raw_link_text) ? "short_url" : "long_url"
280     current_link = Link.find(:first, :conditions => ["? LIKE BINARY ? AND message_id = ?", url_attr, link_body, self.id])
281     if current_link
282       return current_link
283     else
284       new_link = self.links.build(url_attr.intern => link_body)
285       new_link.save
286       return nil 
287     end
288   end