difference between ', " and :

Eddie,

'user' != :user, but Rails uses HashWithIndifferentAccess instead of
standard Hash i many places, so you can use params[:user] or
params['user']

See:
http://api.rubyonrails.org/classes/HashWithIndifferentAccess.html
http://redcorundum.blogspot.com/2006/07/symbolickeyhash.html
http://devblog.famundo.com/articles/2006/05/13/beware-of-hashwithindifferentaccess-symbolize_keys

Alain