How to make requests have different fields for filling in for each category of services?

Question

Django

Good day. There was a need to make sure that different types of services have different fields for filling out applications for the provision of these same services. What are the ways to do this, excluding the creation of models for each category. Is there any universal way? I'm using Django 1.11

Answer 1

for example:
you have a model with types of services, it has some signs that distinguish which fields to show.
You create a form for editing a service. In the form:
1) at init, depending on the conditions, prefill the necessary fields, set required = true
2) at is_valid: check complex filling conditions
in the template, depending on the conditions, display only the necessary fields