Django rest how to do pagination with PageNumberPagination

I wrote the following codes. But when I go to the url posts?page=1, it still shows all of the Post model objects. What should I do?

---

settings.py

REST_FRAMEWORK = {
    'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.PageNumberPagination',
    'PAGE_SIZE': 10
}

ursl.py

path('posts', views.posts_view, name='posts_view')

views.py

@api_view(['GET'])
def posts_view(request):
    posts = Post.objects.all()
    serializer = PostSerializer(posts, many=True)
    return Response(serializer.data)

You are writing a function based view, using @api_view, so you need to do the pagination manually. You can try using the provided generic base api views instead of attempting to re-write this, if it works in your situation:

class PostView(generics.ListAPIView):
    queryset = Post.objects.all()
    serializer_class = PostSerializer
    pagination_class = PageNumberPagination

path('posts', PostView.as_view(), name='posts_view')

To do pagination manually you are going to need to create and invoke the pagination just like the base classes do:

def my_view(request):
    qs = Post.objects.all()
    pagination = PageNumberPagination()
    page = pagination.paginate_queryset(qs, request)
    serializer = PostSerializer(page, many=True)
    return pagination.get_paginated_response(
        serializer.data
    )

To be clear, using @api_view does support other framework features using additional decorators, e.g. @permissions_classes. View level features like pagination & filtering are not supported via decorators.