old_contents: from rest_framework import permissions
  
  # TODO Add write permission for 1%CREW / Assitants.
  class IsAuthorOrReadOnly(permissions.BasePermission):
      """
      Custom permission to only allow author of an object to edit it.
      """
  
      def has_permission(self, request, view, obj=None):
          # Skip the check unless this is an object-level test.
          if obj is None:
              return True
  
          # Read permissions are allowed to any request.
          if request.method in permissions.SAFE_METHODS:
              return True
  
          # Write permissions are only allowed to the author of the reaction.
          return obj.author == request.user
  
new_contents: from rest_framework import permissions
  
  # TODO Add write permission for 1%CREW / Assistants.
  class IsAuthorOrReadOnly(permissions.BasePermission):
      """
      Custom permission to only allow author of an object to edit it.
      """
  
      def has_permission(self, request, view, obj=None):
          # Skip the check unless this is an object-level test.
          if obj is None:
              return True
  
          # Read permissions are allowed to any request.
          if request.method in permissions.SAFE_METHODS:
              return True
  
          # Write permissions are only allowed to the author of the reaction.
          return obj.author == request.user
  
subject: Fix spelling mistake in comment.