Peewee 模型关键字不能是更新的表达式

Question

正如您从下面看到的，我正在尝试更新记录，但由于某种原因我收到了这些错误。我一直在关注 Peewee 文档，我发现其他一些人也有同样的问题，但不是 Djano 的 ORM 而不是 Peewee。我试图输入“__”而不是“。”没有任何运气的分类器。

测试代码

Python 2.7.9 (default, Feb  1 2015, 21:31:28) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-11)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from Wee_Models import Thunderdome, ThunderdomeLog
>>> from peewee import *
>>> import peewee
>>> db = MySQLDatabase(database="GrabaDB", host="localhost", port=3306, user="demo", passwd="demo")
>>> q = Thunderdome.update(status='Updated status').where(Thunderdome.port='2310')
  File "<stdin>", line 1
SyntaxError: keyword can't be an expression
>>> q = Thunderdome.update(status='Updated status').where(Thunderdome__port='2310')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/site-packages/peewee.py", line 272, in inner
    func(clone, *args, **kwargs)
TypeError: where() got an unexpected keyword argument 'Thunderdome__port'
>>>

Thunderdome 模型：

class Thunderdome(BaseModel):
    date = DateTimeField()
    lock_status = IntegerField()
    port = PrimaryKeyField()
    security_key = TextField(null=True)
    serial = TextField(null=True)
    status = TextField(null=True)

    class Meta:
        db_table = 'ThunderDome'

我正在关注 Peewee 的文档：

http://peewee.readthedocs.org/en/latest/peewee/api.html#Model.update

http://peewee.readthedocs.org/en/latest/peewee/querying.html

Updating existing records
Once a model instance has a primary key, any subsequent call to save() will result in an UPDATE rather than another INSERT. The model’s primary key will not change:

>>> user.save()  # save() returns the number of rows modified.
1
>>> user.id
1
>>> user.save()
>>> user.id
1
>>> huey.save()
1
>>> huey.id
2
If you want to update multiple records, issue an UPDATE query. The following example will update all Tweet objects, marking them as published, if they were created before today. Model.update() accepts keyword arguments where the keys correspond to the model’s field names:

>>> today = datetime.today()
>>> query = Tweet.update(is_published=True).where(Tweet.creation_date < today)
>>> query.execute()  # Returns the number of rows that were updated.
4
For more information, see the documentation on Model.update() and UpdateQuery.

Answer 1

你必须写：

q = Thunderdome.update(status='Updatedstatus')\
     .where(Thunderdome.port == '2310')

查看文档 http://docs.peewee-orm.com/en/latest/peewee/api.html?highlight=update#Model.update

Peewee 模型关键字不能是更新的表达式

Peewee Model keyword can't be an expression on Update

python

orm

model

sql-update

peewee