So, I recently observed that a Django ModelForm updates all columns when it
is updating a model instance. This is appropriate for a typical situation
where Django is also in control of the schema.
I also see that you can control this behavior by passing update_fields
<https://docs.djangoproject.com/en/2.2/ref/models/instances/#saving-objects>
to the save method, in a particular form:
self.instance.save(update_fields=self.changed_data)
I have some complicated forms that have non-model fields and many-to-many
fields mixed in there. I'm wondering whether there is a module for Django
out there that gives me some base ModelForms that do not update all fields,
but only changed fields. I am asking because I don't want to work hard to
handle corner cases if there's something already out there. What I
already have is hard-coded to the form where I've made this change to do
only a limited update.
Thanks,
-Dan
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