我的模型字段之一如下:
aaf_1kg_all = models.DecimalField(blank=True, null=True)
当我正常使用我的模型时,一切都很好。当我在一个ready() hook https://docs.djangoproject.com/es/1.9/ref/applications/#django.apps.AppConfig.ready但是,我收到此错误:
SystemCheckError: System check identified some issues:
ERRORS:
myapp.Model.aaf_1kg_all: (fields.E130) DecimalFields must define a 'decimal_places' attribute.
myapp.Model.aaf_1kg_all: (fields.E132) DecimalFields must define a 'max_digits' attribute.
Django 文档说这两个属性是可选的。我看见这个答案 https://stackoverflow.com/questions/30960589/why-is-django-decimalfield-attribute-max-digits-non-optional,但在数据库中定义了小数位数和 max_digits 。
如果我决定添加这些属性,即
aaf_1kg_all = models.DecimalField(blank=True, null=True, max_digits=10, decimal_places=10)
该应用程序运行,但在某些时候我收到此错误:
Traceback (most recent call last):
[...]
variants.extend(list(sub_qs)) # sub_qs is a QuerySet
File ".../django/db/models/query.py", line 258, in __iter__
self._fetch_all()
File ".../django/db/models/query.py", line 1074, in _fetch_all
self._result_cache = list(self.iterator())
File ".../django/db/models/query.py", line 68, in __iter__
for row in compiler.results_iter(results):
File ".../django/db/models/sql/compiler.py", line 808, in results_iter
row = self.apply_converters(row, converters)
File ".../django/db/models/sql/compiler.py", line 792, in apply_converters
value = converter(value, expression, self.connection, self.query.context)
File ".../django/db/backends/sqlite3/operations.py", line 233, in convert_decimalfield_value
value = expression.output_field.format_number(value)
File ".../django/db/models/fields/__init__.py", line 1608, in format_number
return utils.format_number(value, self.max_digits, self.decimal_places)
File ".../django/db/backends/utils.py", line 200, in format_number
value = value.quantize(decimal.Decimal(".1") ** decimal_places, context=context)
decimal.InvalidOperation: [<class 'decimal.InvalidOperation'>]
我是不是忘记了什么?