Rails divese gem do I need to create a model beforehand?

Question

Ruby on Rails

There is a command in the guide - rails generate devise MODEL
MODEL is generated with devise or in advance ?

Answer 1

You don't need to create the model yourself. You need to use devise'a generator.
To better understand this, understand the classes in Ruby, and then look at what is inherited from what during generation.

Answer 2

What's stopping you from trying?