How do I create a class instance from a string name in ruby?

I have the name of a class and I want to create an instance of that class so that I can loop through each rails attribute that is present in the schema of that class.

How would I go about doing that?

1. I have the name as a string of the class I want to check
2. I guess I need to instantiate a class instance so that I can
3. Loop through it's attributes and print them.