Why doesn't the author check the existence of an object in the database before deleting it?

Question

Ruby on Rails

I've seen code like this many times:

def destroy
    user = User.find params[:id]
    user.destroy!
    render nothing: true, status: 204
  end

1. Why does the author not check the presence of this user in the database?
   
2. What happens if it doesn't exist? Will the server throw an error on its own?
   
3. How to set up an application to work with server errors? (500, 501, ...)
   
4. How would it be correct to write this code? What to return to the user? (this is the API code)
   

Answer 1

because the code will fall user = User.find params[:id] - on this line it will not reach the end yet. this is a kind of test.

Answer 2

So these are just examples...

Answer 3

1. Because, as Semyon Semyonov said , these are just examples.
2. An exception will occur ActiveRecord::RecordNotFound
3. The question is not clear, what does it mean to configure server errors?

Answer 4

api.rubyonrails.org/classes/ActiveSupport/Rescuebl...