python - pee wee Meta 子类继承

Question

我正在尝试在我的 python 应用程序中实现 peewee，并且在这样定义我的类时:

import datetime
import peewee as pw
import acme.core as acme

adapter = pw.MySQLDatabase(
    acme.get_config(path='database.db'),
    host=acme.get_config(path='database.host'),
    port=int(acme.get_config(path='database.port', default=3306)),
    user=acme.get_config(path='database.user'),
    passwd=acme.get_config(path='database.password'))


class Model(pw.Model):
    """
    The base model that will connect the database
    """
    id = pw.PrimaryKeyField()
    created_at = pw.DateTimeField()
    updated_at = pw.DateTimeField(default=datetime.datetime.now)

    class Meta:
        database = adapter


class ServerModule(Model):
    enabled = pw.BooleanField()
    ipaddr = pw.IntegerField()
    port = pw.IntegerField()

    class Meta(Model.Meta):
        db_table = 'module_server'

我收到以下错误:

Traceback (most recent call last):
  File "db.py", line 25, in <module>
    class ServerModule(Model):
  File "db.py", line 33, in ServerModule
    class Meta(Model.Meta):
AttributeError: type object 'Toto' has no attribute 'Meta'

我已经尝试了基本的 python 子类继承并且它有效，但在这里它不起作用，有人可以指出我正确的方向吗？

Answer 1

您不需要从父 Meta 属性继承 Meta 类。 Meta.database 等属性自动继承。在你的例子中:

import datetime
import peewee as pw
import acme.core as acme

adapter = pw.MySQLDatabase(
    acme.get_config(path='database.db'),
    host=acme.get_config(path='database.host'),
    port=int(acme.get_config(path='database.port', default=3306)),
    user=acme.get_config(path='database.user'),
    passwd=acme.get_config(path='database.password'))


class Model(pw.Model):
    """
    The base model that will connect the database
    """
    id = pw.PrimaryKeyField()
    created_at = pw.DateTimeField()
    updated_at = pw.DateTimeField(default=datetime.datetime.now)

    class Meta:
        database = adapter


class ServerModule(Model):
    enabled = pw.BooleanField()
    ipaddr = pw.IntegerField()
    port = pw.IntegerField()

    class Meta:
        db_table = 'module_server'