Django ModelForm: What is save(commit=False) used for?

Question

Why would I ever use save(commit=False) instead of just creating a form object from the ModelForm subclass and running is_valid() to v

Answer 1

Here it is the answer (from docs):

# Create a form instance with POST data.
>>> f = AuthorForm(request.POST)

# Create, but don't save the new author instance.
>>> new_author = f.save(commit=False)

The most common situation is to get the instance from form but only 'in memory', not in database. Before save it you want to make some changes:

# Modify the author in some way.
>>> new_author.some_field = 'some_value'

# Save the new instance.
>>> new_author.save()