Ruby on Rails：如何实现搜索功能

I'm very new to Ruby on Rails and actually, I'm trying to implement a search function into my Ruby on Rails page. It's a page where you can add users to a database, you can also edit or delete them. There is my index page where all of those users are getting listed, and, above this table, there is a search function (well, it's just a text field and a button). I'm very new to Ruby on Rails and actually, I'm