how to write some search functionality in ror

Hi all i have only one model in my appliction that is user model(here the user is patient) i as an administrator can enter the patient if i have to retrieve the patient deatails with a specific column name in patient table what will be the code in model, view and controller..any clues.. i am using ruby 1.8.7, rails 2.3.8 and database sqlite3 on my windows7 machine.

HI guys any clue....?

User.find(:column, …) Is a user a patient or have many patients?

users table is having many petient records..