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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def validate_fields_only_with_permissions(self, val, caller_permissions):
 """ To pass field validation, no required field should be missing. This method assumes that the contents of each field have already been validated on assignment, so it's merely a presence check. Should only be called for callers with extra permissions. """

        self.validate_fields_only(val)

        # check if type has been patched
        for extra_permission in caller_permissions.permissions:
            all_field_names = '_all_{}_field_names_'.format(extra_permission)
            for field_name in getattr(self.definition, all_field_names, set()):
                if not hasattr(val, field_name):
                    raise ValidationError("missing required field '%s'" % field_name)