Django How to check email for existence?

Question

Django

Good afternoon.
There is a form successor "ModelForm" with the field "email". How to make it so that when adding to the database there is a check whether there is such an email in the table or not?
As with user login. It is impossible to register several users with one login. Here too most with email'om it is necessary.
Thank you)

Answer 1

If you have an email field in the model, then it's enough to say
Uniqueness will be guaranteed at the DBMS level. There is no form here.