Do some task using models in a view before a request is executed.

[Christian]

Hi there,

I'm kind of a novice in django and like to call rfm_update before the get request in the RFM Viewset will executed, 

but no surprise the migrate doesn't work  for a new deployment.

What is the best practice to do something like rfm_update so that migrate works.

Thanks in advance,

Christian

def rfm_update():    

rfms = RFM.objects.all()

rfms.delete()

df_rfm = pd.DataFrame(list(Order.objects.all().values()))

rfm_data = processing(df_rfm, datetime_col='order_datetime', customer_id_col='customer_id').reset_index()

RFM.objects.bulk_create([RFM(customer_id=rec[0],

frequency=rec[1],

recency=rec[2],

T=rec[3]) for rec in rfm_data.values])    

class RFMViewSet(viewsets.ModelViewSet):

   rfm_update()      # Not good!

   queryset = RFM.objects.all()

   serializer_class = RFMSerializer

   lookup_field = 'customer_id'

   http_method_names = ['get']

[Jason]

DRF viewsets provide default implementations of list (GET resource/) and retrieve (GET resource/id).  You can just reimplement those methods and call `rfm_update` in them.

[Christian]

Thanks!