I've inherited a project initially developed in Django 1.11.8. Unfortunately, the original team left without providing any documentation, and there are minimal comments in the code. I'm currently updating the project to Django 5.1.7 and managed to resolve most issues, but I've hit a roadblock with Webpack Loader.

I'm encountering the following error during template rendering:

Error during template rendering
In template /home/alejandro/new-dell/wfp_voluntariado/pae_source/new_refact_version/app/partner/templates/schools/admin.html, error at line 54 expected string or bytes-like object, got 'dict'

Relevant code in the template (admin.html):

{% block js %}
    {{ block.super }}
    <script src="{% static 'js/plugins/toastr/toastr.min.js' %}"></script>
    <script type="text/javascript">
        var context = {
            departments: {{ departments|safe }},
            csrf_token: "{{ csrf_token }}",
            height: "100%",
            urls: {
                "get_municipalities": "{% url 'api_v1:get_municipalities' %}"
            }
        }
    </script>
    
    {% render_bundle 'vendor' 'js' 'PARTNER' %}
    {% render_bundle 'partner/PartnerSchoolsApp' 'js' 'PARTNER' %}
{% endblock %}

Class-based view (PartnerSchoolsRegisterView):

class PartnerSchoolsRegisterView(AjaxResponseMixin, JSONResponseMixin, TemplateView):
    template_name = 'schools/admin.html'
    partner = None

    def dispatch(self, request, *args, **kwargs):
        self.partner = request.partner
        return super().dispatch(request, *args, **kwargs)

    def get_context_data(self, **kwargs):
        ctx = super().get_context_data(**kwargs)
        departamentos = [{
            'pk': pc.pk,
            'code': pc.code,
            'name': u'{0} | {1}'.format(pc.code, pc.name)
        } for pc in Departamento.objects.all()]

        ctx.update(
            departments=json.dumps(departamentos),
            regions_url=reverse('administration:get_regions'),
        )
        print(ctx)
        return ctx

What I've Tried

• Verified the context data using print(ctx) — it seems to output a valid JSON string.
• Ensured that Webpack Loader is properly installed and configured. Attempted to isolate the issue by simplifying the template.

Based on the error message, it seems like Webpack Loader may be receiving a dictionary (dict) instead of a string or a valid path for the JavaScript bundle.

Is there an issue with the way I'm using {% render_bundle %} in the updated Django version? Could there be a problem with how the context variable departments is being serialized as JSON? Is there a more appropriate approach to handle Webpack bundles in Django 5.1.7?