class based (2) (generics ক্লাস ভিউ)

আমরা django তে generics ভিউ নিয়ে কাজ করেছি যার মধ্যে ডেটাবেজ অপারেশন এর কোড দেয়া থাকে আমরা যখন ব্যবহার করি তখন সামান্য কিছু কোড দিলেই অটোমেটিক্যালি crud এর কাজ হয়ে যায় যেমন LISTVIEW এর মধ্যে model ও টেম্পলেট বলে দিলেই ডিফল্ট ভাবে লিস্ট টেম্পলেট এ শো করার কাজ ভিউটি করে দেবে ঠিক তেমনি হলো রেস্ট এর generics . প্রাক্টিক্যাল দেখি

ListCreateAPIView & RetrieveUpdateDestroyAPIView

# models.py
from django.db import models

class Post(models.Model):
    id = models.AutoField(primary_key=True)
    title = models.CharField(max_length=255)
    content = models.TextField()
    active = models.BooleanField(default=False)

    def __str__(self):
        return self.title

# serializers.py
from rest_framework import serializers
from .models import Post

class PostSerializer(serializers.ModelSerializer):
    class Meta:
        model = Post
        fields = ['id', 'title', 'content', 'active']

# views.py
from rest_framework import generics, status
from rest_framework.response import Response
from .models import Post
from .serializers import PostSerializer

class PostListCreate(generics.ListCreateAPIView):
    # This view handles GET (list) and POST (create) requests for the Post model
    queryset = Post.objects.all()
    serializer_class = PostSerializer

class PostRetrieveUpdateDestroy(generics.RetrieveUpdateDestroyAPIView):
    # This view handles GET (retrieve), PUT (update), and DELETE (destroy) requests for a single Post instance
    queryset = Post.objects.all()
    serializer_class = PostSerializer

    def delete(self, request, *args, **kwargs):
        # Custom delete method to handle DELETE request for a single Post instance
        instance = self.get_object()
        self.perform_destroy(instance)
        return Response(status=status.HTTP_204_NO_CONTENT)
 
    
    
    

# urls.py
from django.urls import path
from .views import PostListCreate, PostRetrieveUpdateDestroy

urlpatterns = [
    path('posts/', PostListCreate.as_view(), name='post-list-create'),
    path('posts/<int:pk>/', PostRetrieveUpdateDestroy.as_view(), name='post-retrieve-update-destroy'),
]

ListAPIView

যদি চাই শুধু সবগুলো পোস্ট দেখতে তাহলে নিচের ভিউ ক্লাস ব্যবহার করবো

from .models import Post
from .serializers import PostSerializer
from rest_framework import generics
class PostListView(generics.ListAPIView):
    queryset = Post.objects.all()
    serializer_class = PostSerializer

from django.urls import path
from .views import PostListView

urlpatterns = [
      path('posts/', PostListView.as_view(), name='post-list'),

]

Api Documentation

Create a new Post:

• URL: http://localhost:8000/blogapi/posts/
• Method: POST
• Body: JSON

{
    "title": "New Post",
    "content": "This is a new post content.",
    "active": true
}

• Description: Create a new post with the provided title, content, and active status.

1. Retrieve all Posts:
   • URL: http://localhost:8000/blogapi/posts/
   • Method: GET
   • Description: Retrieve all existing posts.
2. Retrieve a Post by ID:
   • URL: http://localhost:8000/blogapi/posts/<id>/
   • Method: GET
   • Description: Retrieve the post with the specified ID.
3. Update a Post:
   • URL: http://localhost:8000/blogapi/posts/<id>/
   • Method: PUT
   • Body: JSON

{
    "title": "Updated Post",
    "content": "This is the updated post content.",
    "active": false
}

Description: Update the post with the specified ID with new title, content, and active status.

1. Delete a Post:
   • URL: http://localhost:8000/blogapi/posts/<id>/
   • Method: DELETE
   • Description: Delete the post with the specified ID.

Replace <id> with the actual ID of the post you want to retrieve, update, or delete.