gistfile1.py

class ServiceType(object):
    def __init__(self, name=None, form=None, template=None, context=None)
        self.name = name
        self.slug = slugify(self.name) if self.name else None
        self.form = form
        self.service_template = template
        self.context = context

        if not self.name and self.form and self.template:
            raise CustomError("You must define {}".format(missing_field)

    def __str__(self):
        return self.name

    def render_service_template(self):
        # logic with self.context
        pass

    def deploy(self):
        # shouldn't this be on the service model itself?
        pass

    # Any other functions that are required to be implemented in the child classes
    # can raise NotImplementedError to force them to be defined

class PostgresForm(forms.Form):
    username = forms.CharField(max_length=56, required=True)
    password = forms.PasswordField(max_length=30)
    # etc etc, get built in validation from django form

class PostgresServiceType(ServiceType):
    # overwrite any functionality as necessary from Service Type

# then in the view or whatever:
form = PostgresForm
postgres_type = PostgresServiceType(name="Postgres Database",
                                    form=form,
                                    template='templatefile',
                                    context=[],)
service = Service.objects.create(service_type=postgres_type, otherfields=othervalues)