models.py

class Resource(models.Model):
    title = models.CharField(max_length=256)
    url = models.URLField()
    tags = models.ManyToManyField(Tag)

    def __str__(self):
        return f'{self.title}'

    def __iter__(self):
        yield 'id', self.id
        yield 'title', self.title
        yield 'url', self.url
        yield 'tags', [tag.name for tag in self.tags.all()]

views.py

from django.http.response import JsonResponse

from network.models import Resource, Connection, ResourceSerializer


def network(request):
    serializer = ResourceSerializer()
    nodes = Resource.objects.all().prefetch_related('tags')
    links = Connection.objects.all()
    return JsonResponse({
        'nodes': [dict(node) for node in nodes],
        'links': serializer.serialize(links),
    })