Question

我正在使用旧数据库，并且在将一个表中的外键连接到另一个表中的主键时遇到一些问题。我非常感谢任何帮助。下面是模型和我的shell +错误。提前谢谢。

型号：

class SectionMaster(models.Model):
    . . .
    crs_cde = models.ForeignKey('SectionSchedules', max_length=30, db_column=u'CRS_CDE', related_name='sm_crs_cde')
    . . .

class SectionSchedules(models.Model):
    . . .
    crs_cde = models.CharField(max_length=30, db_column=u'CRS_CDE')
    . . .

错误：

>>> q = SectionMaster.objects.filter(trm_cde=20).filter(yr_cde=2012)
>>> q2 = SectionSchedules.objects.filter(trm_cde=20).filter(yr_cde=2012)
>>> for course in q:
...     for course2 in q2:
...         if course.crs_cde == course2.crs_cde: ## also tried course.crs_cde_id
...             print course.crs_cde, course.crs_title, course2.begin_dte
...
Traceback (most recent call last):
  File "<console>", line 3, in <module>
  File "C:\Python27\lib\site-packages\django\db\models\fields\related.py", line
350, in __get__
    rel_obj = qs.get(**params)
  File "C:\Python27\lib\site-packages\django\db\models\query.py", line 358, in g
et
    clone = self.filter(*args, **kwargs)
  File "C:\Python27\lib\site-packages\django\db\models\query.py", line 624, in f
ilter
    return self._filter_or_exclude(False, *args, **kwargs)
  File "C:\Python27\lib\site-packages\django\db\models\query.py", line 642, in _
filter_or_exclude
    clone.query.add_q(Q(*args, **kwargs))
  File "C:\Python27\lib\site-packages\django\db\models\sql\query.py", line 1250,
 in add_q
    can_reuse=used_aliases, force_having=force_having)
  File "C:\Python27\lib\site-packages\django\db\models\sql\query.py", line 1185,
 in add_filter
    connector)
  File "C:\Python27\lib\site-packages\django\db\models\sql\where.py", line 69, i
n add
    value = obj.prepare(lookup_type, value)
  File "C:\Python27\lib\site-packages\django\db\models\sql\where.py", line 320,
in prepare
    return self.field.get_prep_lookup(lookup_type, value)
  File "C:\Python27\lib\site-packages\django\db\models\fields\__init__.py", line
 972, in get_prep_lookup
    return super(IntegerField, self).get_prep_lookup(lookup_type, value)
  File "C:\Python27\lib\site-packages\django\db\models\fields\__init__.py", line
 310, in get_prep_lookup
    return self.get_prep_value(value)
  File "C:\Python27\lib\site-packages\django\db\models\fields\__init__.py", line
 966, in get_prep_value
    return int(value)
ValueError: invalid literal for int() with base 10: '0BJ  226  1
   '

Answer 1

我希望你希望ForeignKey上的to_field='crs_cde'告诉它查看目标表的crs_cde字段的值，而不是（整数）主键。

Answer 2

检查您的列crs_cde_id - 它应该是数据库中的Int类型。但似乎你在那里有角色。

在django外键中的ValueError（对于基数为10的int（）的无效文字）

2 个答案: