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I know that I can use the db schema to easily generate CRUD for me. But I want to do a simple login page, it only using the “user” object, check whether the password & user name is correct. So, I want to create an “system” object which have a “login” method. How can I do that in RoR?
You can create a Controller and views without model and that will work. It looks like you want a super simple login which is described in this railscast. To see how to restrict access to pages, see the previous railscast