Django

pip install djangorestframework django-cors-headers 

--------------------------------------------------------------

# after creating/changing models.py execute below commands in terminal project folder 

python manage.py makemigrations

python manage.py migrate 

-------------------------------------------------------------------------------------------------

views.py 

from rest_framework.decorators import api_view
from rest_framework.response import Response
from rest_framework import status
from .models import Item
from .serializers import ItemSerializer

from django.views.decorators.csrf import csrf_exempt 

@csrf_exempt
@api_view(['GET', 'POST'])
def item_list(request):
    if request.method == 'GET':
        items = Item.objects.all()
        serializer = ItemSerializer(items, many=True)
        return Response(serializer.data)

    elif request.method == 'POST':
        serializer = ItemSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

@csrf_exempt
@api_view(['GET', 'PUT', 'DELETE'])
def item_detail(request, pk):
    try:
        item = Item.objects.get(pk=pk)
    except Item.DoesNotExist:
        return Response(status=status.HTTP_404_NOT_FOUND)

    if request.method == 'GET':
        serializer = ItemSerializer(item)
        return Response(serializer.data)

    elif request.method == 'PUT':
        serializer = ItemSerializer(item, data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

    elif request.method == 'DELETE':
        item.delete()
        return Response(status=status.HTTP_204_NO_CONTENT)

------------------------------------------------------------------------------------

# urls.py 

# myapp/urls.py

from django.urls import path

from .views import item_list, item_detail

urlpatterns = [

    path('items/', item_list, name='item_list'),

    path('items/<int:pk>/', item_detail, name='item_detail'),

]

----------------------------------------------------------------------

models.py 

from django.db import models 

class item(models.Model):

    id = models.AutoField(primary_key=True)

    name = models.CharField(max_length=500)

    price = models.CharField(max_length=500)

    def __str__(self) -> str :

        return super().__str__() 

---------------------------------------------------------------------

serializers.py 

from rest_framework import serializers 

from .models import item 

class itemSerializer(serializers.ModelSerializer):

    class Meta:

        model = item 

        fields = "__all__"

---------------------------------------------------------------------

settings.py 

INSTALLED_APPS = [

'rest_framework',

'corsheaders',

'your_app_name'

]

MIDDLEWARE = [

#

# add below line 

'corsheaders.middleware.CorsMiddleware',

# add above line just above below line

'django.middleware.common.CommMiddleware',

]

# add this line here so you  can integrate with frontend like 'REACT JS / ANGULAR' 

# below is for all domain/servers can access django app

CORS_ORIGIN_ALLOW_ALL = True 

# if you want to specify domains/servers

CORS_ORIGIN_WHITELIST = (

'http://localhost:3000'

)

MEDIA_URL = "/media/"

MEDIA_ROOT = BASE_DIR / "templates"

# to prevent 'CSRF error' while performing post,put operation through 'postman or react js'

CSRF_TRUSTED_ORIGINS = [

    'http://127.0.0.1:8000/post_cities'

]

# or add @csrf_exempt or @api_view(['POST','PUT','DELETE']) above views in views.py  

# 

--------------------------------------------------------------

# don't forget to create "media and templates" directories in your main project folder otherwise 

it'll give you error 

--------------------------------------------------------------

main project urls.py 

from django.contrib import admin

from django.urls import path,include

from django.conf.urls.static import static

from django.conf import settings 

urlpatterns = [

path("admin/", admin.site.urls),

path("",include("your_app_name.urls")

]+ static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

----------------------------------------------------------------------------------------