URL aliasing

Hi all,

I have used url aliasing on my site. say suppose my url is

domain/blog/1 to domain/blog/1/title in this i have succeded to redirect
the url to a particular blog on its id with blog title, by defining the
routes

  map.blog 'blog/edit/:id/:title', :id=> 'id', :controller => 'blog',
:action => 'show'

when i edit a particular blog it is giving me this error like

Couldn't find Service with ID=update

means it is not getting the id for tht blog, so wht should i define in
controller or in routes so tht i can take id of tht blog with title,
???//>???

any help would be appreciated,

Thanks a lot

Naresh Rana