[Answered ]-Django admin site – limit user content on user

admin.py:

from django.contrib import admin
from .models import Blog

@admin.register(Blog)
class BlogAdmin(admin.ModelAdmin):

    def has_change_permission(self, request, obj=None):
        if obj is not None and obj.created_by != request.user:
            return False
        return True

    def has_delete_permission(self, request, obj=None):
        if obj is not None and obj.created_by != request.user:
            return False
        return True

The ModelAdmin class has a method called get_queryset() where you can specify which objects someone will see.

from django.contrib import admin
from .models import Blog

@admin.register(Blog)
class BlogAdmin(admin.ModelAdmin):
    def get_queryset(self, request):
        queryset = super().get_queryset(request)
        return queryset.filter(author=request.user)