python - Django (1.9) makemigrations 在 bool 字段上没有得到 Blank=True

Question

我有以下模型:

class Site(models.Model):
    """
    Model for a site entry
    @author: Leonardo Pessoa
    @since: 05/09/2016 
    """
    from decimal import Decimal

    consolidated_financials     = models.BooleanField(blank=True)
    type                        = models.ForeignKey(Type)
    tier1_business              = models.ForeignKey(Business, limit_choices_to = {'tier': 1}, related_name='%(class)s_tier1')

请注意，consolidated_financials 字段现在有 blank=True 语句。这是新包括的。当我运行 makemigrations 时，它没有得到更改，但是当我添加到 finance_manager_sso 时它工作正常。

对于 bool 字段有没有具体的限制？

谢谢

Answer 1

BooleanField不采用 null=True，而是使用 NullBooleanField .

有一个great answer Jacob Maristany 在 Programmers.se 上解释了这口井背后的原因

By allowing nulls in a boolean field, you are turning an intended binary representation (true/false) into a tri-state representation (true, false, null) where your 'null' entries are indeterminate.

有关完整讨论，请参阅 Should I store False as Null in a boolean database field?