posts_permissions.py

from rest_framework import permissions

class IsOwnerOrReadOnly(permissions.BasePermission):
    """
    Custom permission to only allow owners of an object to edit it.
    """

    def has_object_permission(self, request, view, obj):        
        # Read permissions are allowed to any request
        if request.method in permissions.SAFE_METHODS:            
            return True

        # Write permissions are only allowed to the owner of the tip
        return obj.author == request.user