python - Cleaner / reusable way to emit specific JSON for django models -

i'm rewriting end of app use django, , i'd keep front end untouched possible. need consistent json sent between projects.

in models.py have:

class resource(models.model):     # name chosen consistency old app     _id = models.autofield(primary_key=true)     name = models.charfield(max_length=255)      @property     def bookingpercentage(self):         bookings.models import booking         return booking.objects.filter(resource=self)             .aggregate(models.sum("percent"))["percent__sum"] 

and in views.py gets resource data json:

def get_resources(request):     resources = []     resource in resource.objects.all():         resources.append({             "_id": resource._id,             "name": resource.first,             "bookingpercentage": resource.bookingpercentage                              })     return httpresponse(json.dumps(resources)) 

this works need to, seems antithetical django and/or python. using .all().values not work because bookinpercentage derived property.

another issue there other similar models need json representations in pretty same way. rewriting similar code , using different names values of models. in general there better way more pythonic/djangothonic/does not require manual creation of json?

here's in situation:

def get_resources(request):     resources = list(resource.objects.all())     resource in resources:         resource.booking = resource.bookingpercentage()                     

that is, create new attribute each entity using derived property. it's local attribute (not stored in database), it's available json.dumps() call.