[英]peewee foreign key error
我正在嘗試使用peewee為現有數據庫創建一個簡單模型。
本文描述了我正在使用的數據庫。
我已經用pwiz生成了一個可以正常工作的模型,但是它並沒有為我創建啟用聯接的外鍵。 因此,我對模型進行了編輯,如下所示:
from peewee import *
database = MySQLDatabase('enron', **{'password': '...', 'user': 'root'})
class UnknownField(object):
pass
class BaseModel(Model):
class Meta:
database = database
class Employee(BaseModel):
email = CharField(db_column='Email_id', unique=True)
eid = PrimaryKeyField()
class Meta:
db_table = 'employeelist'
class Message(BaseModel):
mid = PrimaryKeyField()
sender = ForeignKeyField(Employee,
related_name='messages',
to_field='email') # was CharField() before my edit
class Meta:
db_table = 'message'
但是,當我嘗試運行時:
for message in Message.select():
print message.mid
我收到一個錯誤:
Traceback (most recent call last):
File "DBModelEnron.py", line 62, in <module>
for message in Message.select():
File "/usr/local/lib/python2.7/dist-packages/peewee.py", line 2514, in __iter__
return iter(self.execute())
File "/usr/local/lib/python2.7/dist-packages/peewee.py", line 2507, in execute
self._qr = ResultWrapper(model_class, self._execute(), query_meta)
File "/usr/local/lib/python2.7/dist-packages/peewee.py", line 2203, in _execute
return self.database.execute_sql(sql, params, self.require_commit)
File "/usr/local/lib/python2.7/dist-packages/peewee.py", line 2833, in execute_sql
self.commit()
File "/usr/local/lib/python2.7/dist-packages/peewee.py", line 2688, in __exit__
reraise(new_type, new_type(*exc_value.args), traceback)
File "/usr/local/lib/python2.7/dist-packages/peewee.py", line 2825, in execute_sql
cursor.execute(sql, params or ())
File "/usr/lib/python2.7/dist-packages/MySQLdb/cursors.py", line 174, in execute
self.errorhandler(self, exc, value)
File "/usr/lib/python2.7/dist-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler
raise errorclass, errorvalue
peewee.OperationalError: (1054, "Unknown column 't1.sender_id' in 'field list'")
我在這里發現了類似的問題,但是定義了正確的PrimaryKey。
只需在您的外鍵上添加db_column=''
:
sender = ForeignKeyField(Employee,
db_column='sender', # Added this.
related_name='messages',
to_field='email') # was CharField() before my edit
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