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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了一些问题。如果有任何帮助，我将不胜感激。以下是模型和我的 shell+ 错误。提前致谢。

楷模：

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
   '
4

2 回答 2

3

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

于 2012-11-23T07:55:08.383 回答
0

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

于 2012-11-23T03:37:09.163 回答