[英]SQLite3 OperationalError: Table XYZ has no column named ABC
I am new to peewee, so please forgive me if this is a stupid question. 我是peewee的新手,所以如果这是一个愚蠢的问题,请原谅我。 I have searched on Google and in the peewee cookbook, but found no solution so far. 我在Google和peewee食谱上搜索过,但到目前为止还没有找到解决办法。
So, I have the following models to four of my DB tables: 所以,我的四个数据库表有以下模型:
class games_def(Model):
id = PrimaryKeyField()
name = TextField()
class Meta:
database = dbmgr.DB
class users_def(Model):
id = PrimaryKeyField()
first_name = TextField()
last_name = TextField()
class Meta:
database = dbmgr.DB
class sessions(Model):
id = PrimaryKeyField()
game = ForeignKeyField(games_def, related_name = 'sessions')
user = ForeignKeyField(users_def, related_name = 'sessions')
comment = TextField()
class Meta:
database = dbmgr.DB
class world_states(Model):
session = ForeignKeyField(sessions)
time_step = IntegerField()
world_state = TextField()
class Meta:
database = dbmgr.DB
Using these models I connect to an SQLite3 DB via peewee, which works fine. 使用这些模型,我通过peewee连接到SQLite3数据库,工作正常。 After the connection has been established I do the following in my main Python code: 建立连接后,我在我的主要Python代码中执行以下操作:
models.world_states.create(session = 1, time_step = 1)
However, this gives me the following error: 但是,这给了我以下错误:
sqlite3.OperationalError: table world_states has no column named session_id
That is basically correct, the table world_state does indeed not contain such a column. 这基本上是正确的,表world_state确实不包含这样的列。
However, I cannot find any reference to "session_id" in my code at all. 但是,我在代码中找不到任何对“session_id”的引用。
Whe does peewee want to use that "session_id" colum name? peewee想要使用那个“session_id”列名吗?
Do I miss something essentially here? 我基本上会错过什么吗?
When you specify a ForeignKeyField()
peewee expects to use a column ending in _id
based on their own name. 当您指定ForeignKeyField()
peewee希望根据自己的名称使用以_id
结尾的列。 Your wold_states.session
field thus results in an column named session_id
. 因此,您的wold_states.session
字段会生成名为session_id
的列。
You can override this by setting db_column
for that field: 您可以通过为该字段设置db_column
来覆盖它:
class world_states(Model):
session = ForeignKeyField(sessions, db_column='session')
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