helpers.py 文件源码

def __init__(self, model, field, column_id, query_params, ordering_query_param):
        self.model = model
        self.field_name = field

        self.order_field = None
        if self.field_name.startswith("_") and self.field_name != "__str__":
            raise SmartListException("Cannot use underscore(_) variables/functions in smart lists")
        try:
            self.model_field = self.model._meta.get_field(self.field_name)
            self.order_field = self.field_name
        except FieldDoesNotExist:
            self.model_field = None
            try:
                field = getattr(self.model, self.field_name)
                if callable(field) and getattr(field, 'admin_order_field', False):
                    self.order_field = getattr(field, 'admin_order_field')
                if callable(field) and getattr(field, 'alters_data', False):
                    raise SmartListException("Cannot use a function that alters data in smart list")
            except AttributeError:
                self.order_field = self.field_name
                pass  # This is most likely a .values() query set

        if self.order_field:
            self.order = SmartOrder(query_params=query_params, column_id=column_id, ordering_query_param=ordering_query_param)
        else:
            self.order = None