How to count rows on PostgreSQL database in Django? - django

Question

How to count rows on PostgreSQL database in Django and show using highchart?
Example: I want to show how much record/row from 7.00am to 7.00 am next day.
models:
from django.db import models
from datetime import datetime, date
class hujan(models.Model):
id = models.AutoField(primary_key=True)
tanggal = models.DateTimeField(auto_now_add=True)
dtinms = models.IntegerField()
hujan = models.FloatField()
serializers:
from rest_framework import serializers
from .models import hujan, cahayasuhukelembapan
class hujanSerializer(serializers.ModelSerializer):
class Meta:
model = hujan
fields = ('tanggal','dtinms','hujan')
views:
from django.shortcuts import render, get_object_or_404
from django.http import HttpResponse, JsonResponse
from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework.renderers import TemplateHTMLRenderer
from .models import hujan
from .serializers import hujanSerializer
def homePageView(request):
return render(request,'homepage.html')
class hujanlistall(APIView):
def get(self, request):
Hujan = hujan.objects.all()
serializer = hujanSerializer(Hujan, many=True)
return JsonResponse(serializer.data,safe=False)

Answer 1

Modify "views.py" file,
import datetime
class hujanlistall(APIView):
def get(self, request):
Hujan = hujan.objects.filter(tanggal__range = (datetime.datetime.combine(start_date,datetime.time.min),datetime.datetime.combine(end_date, datetime.time.max)))
RowCount = len(Hujan)
serializer = hujanSerializer(Hujan, many=True)
return JsonResponse(serializer.data,safe=False)