Python peewee：在混合模型 class 中引用自我价值属性

Question

我有一个 class:

class FixedTransaction(Transaction):
    except_dates = JSONField(null=True)
    active = BooleanField(null=True)
    exp_day = IntegerField()

    _exp_date_month = None
    _exp_date_year = None

    @hybrid_property
    def is_exp(self):
        return datetime(2018, 5, self.exp_day)

我需要获取属性 (exp_day) 的值，它是一个整数值，但它 returns 是 IntergerField:

的一个实例

Traceback (most recent call last):
  File "/home/ginoepri/Development/Python/pkg/console.py", line 85, in <module>
    fixeds = FixedTransaction.select().where(FixedTransaction.is_exp > datetime(2010, 5, 1))
  File "/usr/lib/python3.6/site-packages/playhouse/hybrid.py", line 27, in __get__
    return self.expr(instance_type)
  File "/home/ginoepri/Development/Python/pkg/models/fixed_transaction.py", line 20, in is_exp
    return datetime(2018, 5, self.exp_day)
TypeError: an integer is required (got type IntegerField)

如何引用属性的实际值（在本例中为整数）？

Answer 1

当作为 class 属性访问时，将使用字段本身。您需要将其作为实例属性访问，以便检索 self.exp_day.

的值

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Python peewee：在混合模型 class 中引用自我价值属性