mixins.py

from django.core.exceptions import ImproperlyConfigured
from django.views.generic.base import TemplateResponseMixin


class HtmxTemplateResponseMixin(TemplateResponseMixin):
    htmx_template_name = None
    

    def get_template_names(self):
        """
        Return a list of template names to be used for the request. Must return
        a list. May not be called if render_to_response() is overridden.
        """
        super().get_template_names()
        
        if self.template_name is None or self.htmx_template_name is None:
            raise ImproperlyConfigured(
                "HtmxTemplateResponseMixin requires either a definition of "
                "'htmx_template_name' and 'template_name' or an implementation of 'get_template_names()'")
        
        if self.request.htmx:
            return [self.htmx_template_name]

        return [self.template_name]