Django 类型错误 : argument must be int or float when trying to access model

Question

每当我尝试访问我的模型之一时，我都会遇到一个非常奇怪的错误。所有其他模型都可以正常工作。

这是我的模型的样子:

class Hop(models.Model):
    name = models.CharField(max_length=100, null=True, blank=True)
    aa = models.DecimalField(max_digits=15, decimal_places=2, null=True, blank=True, default = 10)
    b = models.DecimalField(max_digits=15, decimal_places=2, null=True, blank=True)
    type = models.CharField(max_length=100, null=True, blank=True)
    description = models.CharField(max_length=600, null=True, blank=True)
    user_created = models.BooleanField(default=True)

    def __unicode__(self):
        return self.name

当我运行 Hop.objects.all() 时，出现以下错误。以前从未见过这个。

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "C:\Users\corym\Documents\Projects\mybrewlab vue\Backend\mybrewlabapi\env3\lib\site-packages\django\db\models\query.py", line 250, in __repr__
    data = list(self[:REPR_OUTPUT_SIZE + 1])
  File "C:\Users\corym\Documents\Projects\mybrewlab vue\Backend\mybrewlabapi\env3\lib\site-packages\django\db\models\query.py", line 274, in __iter__
    self._fetch_all()
  File "C:\Users\corym\Documents\Projects\mybrewlab vue\Backend\mybrewlabapi\env3\lib\site-packages\django\db\models\query.py", line 1242, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "C:\Users\corym\Documents\Projects\mybrewlab vue\Backend\mybrewlabapi\env3\lib\site-packages\django\db\models\query.py", line 72, in __iter__
    for row in compiler.results_iter(results):
  File "C:\Users\corym\Documents\Projects\mybrewlab vue\Backend\mybrewlabapi\env3\lib\site-packages\django\db\models\sql\compiler.py", line 1044, in apply_converters
    value = converter(value, expression, connection)
  File "C:\Users\corym\Documents\Projects\mybrewlab vue\Backend\mybrewlabapi\env3\lib\site-packages\django\db\backends\sqlite3\operations.py", line 285, in converter
    return create_decimal(value).quantize(quantize_value, context=expression.output_field.context)
TypeError: argument must be int or float

Answer 1

只需删除该应用程序的迁移文件夹(接受 __init__.py)中的所有文件，并删除 db.sqlite3 .然后再次进行迁移，并在迁移后再次创建 super 用户。
它对我有用。