撒尿凌晨元子類繼承

Question

我想實現我的Python應用程序peewee，並確定我的課的時候是這樣的：

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' 

我收到以下錯誤：

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' 

我曾嘗試基本的Python子類繼承和它的工作原理，但在這裏它不，有人可以指向我正確的方向？

Answer 1

您不需要從父元屬性繼承元類。 Meta.database和其他屬性會自動繼承。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'