Question

I know that I can use Query language to find the record I want. I am doing a login page, I want to find the record which match the user name and password, but I don’t want to loop all the elements to find out the user I want (<% @users.each do |user| %>), wt should I do in RoR, except typing SQL.

Answer 1

perhaps:

User.first(:conditions => {:login => 'ted', :password => 'secret'})
# returns nil for no match and first match for a good record 
# make sure there is a unique index on login 

For authentication I would strongly recommend authlogic (railscast)