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在一个项目中经常要对远端的一个数据库中的数据做修改，每次都写sql感觉很麻烦，就想到能不能直接利用django的后台管理功能呢，当然是可以的，但是要登录django的后台使用它的管理功能必须在对应的数据库创建django后台管理需要的user和Log相关的表，而这个又是不可能的，那能不能不创建user表而仅仅是使用它的后台管理功能呢，答案是可以的

django后台登录需要输入用户名、密码，用户登录验证的backend默认是django.contrib.auth.backends，而它采用的是数据库表的验证，为了不创建新表，我们需要修改登录验证的backends，

修改的方法很简单，在setting.py中添加配置

AUTHENTICATION_BACKENDS = ["houtai.extend.auth.backends.SimpleBackend"]#用户验证的Backend

from __future__ import unicode_literalsfrom houtai.extend.auth.user import SingleUserclass SimpleBackend(object):    """    Authenticates against settings.AUTH_USER_MODEL.    """    def authenticate(self, username=None, password=None):        cur_user = SingleUser()        if cur_user.validate(username,password):            return cur_user            def get_user(self, user_id):        return SingleUser()

from houtai.extend.common import Singletonclass SingleUser(Singleton):    username = "admin"    password = "111111"    is_active = 1    is_staff =1    is_superuser =1    pk = '123456'           def validate(self,username,password):        if username and password:            if username == self.username and password == self.password:                return True        return False    def save(self,update_fields=['last_login']):        return    def has_module_perms(self, app_label):        """        Returns True if the user has any permissions in the given app label.        Uses pretty much the same logic as has_perm, above.        """        # Active superusers have all permissions.        if self.is_active and self.is_superuser:            return True        return False    def has_perm(self, perm, obj=None):        return True

"Table 'test.django_content_type' doesn't exist"

1、修改admin后台首页的模板：

在url.py中添加admin.site.index_template = 'houtai/index.html'

index.html

{% extends "admin/base_site.html" %}{% load i18n admin_static %}{% block extrastyle %}{
  { block.super }}
   {% endblock %}{% block coltype %}colMS{% endblock %}{% block bodyclass %}dashboard{% endblock %}{% block breadcrumbs %}{% endblock %}{% block content %}
   
    {% if app_list %}    {% for app in app_list %}        
    
        
     
        {% for model in app.models %}            
                    {% if model.admin_url %}                
            {% else %}                
            {% endif %}            {% if model.add_url %}                
            {% else %}                
            {% endif %}            {% if model.admin_url %}                
            {% else %}                
            {% endif %}            
        {% endfor %}        
              
            
                       {% blocktrans with name=app.name %}{
  { name }}{% endblocktrans %}                    
      
      
       
        
{ { model.name }}
        
{ { model.name }}
        
{% trans 'Add' %}
        
 
        
{% trans 'Change' %}
        
 
       
      
     
        
    
    {% endfor %}{% else %}    
    
{% trans "You don't have permission to edit anything." %}
{% endif %}
   
{% endblock %}

修改：

action_list = LogEntry.objects.filter(                object_id=unquote(object_id),                content_type__id__exact=ContentType.objects.get_for_model(model).id            ).select_related().order_by('action_time')

if settings.LOGGING != None:            action_list = LogEntry.objects.filter(                object_id=unquote(object_id),                content_type__id__exact=ContentType.objects.get_for_model(model).id            ).select_related().order_by('action_time')

from django.contrib.admin.models import LogEntry, ADDITION            LogEntry.objects.log_action(                user_id=request.user.pk,                content_type_id=ContentType.objects.get_for_model(object).pk,                object_id=object.pk,                object_repr=force_text(object),                action_flag=ADDITION            )

if settings.LOGGING != None:            from django.contrib.admin.models import LogEntry, ADDITION            LogEntry.objects.log_action(                user_id=request.user.pk,                content_type_id=ContentType.objects.get_for_model(object).pk,                object_id=object.pk,                object_repr=force_text(object),                action_flag=ADDITION            )

from django.contrib.admin.models import LogEntry, CHANGE            LogEntry.objects.log_action(                user_id=request.user.pk,                content_type_id=ContentType.objects.get_for_model(object).pk,                object_id=object.pk,                object_repr=force_text(object),                action_flag=CHANGE,                change_message=message            )

if settings.LOGGING != None:            from django.contrib.admin.models import LogEntry, CHANGE            LogEntry.objects.log_action(                user_id=request.user.pk,                content_type_id=ContentType.objects.get_for_model(object).pk,                object_id=object.pk,                object_repr=force_text(object),                action_flag=CHANGE,                change_message=message            )

from django.contrib.admin.models import LogEntry, DELETION            LogEntry.objects.log_action(                user_id=request.user.pk,                content_type_id=ContentType.objects.get_for_model(self.model).pk,                object_id=object.pk,                object_repr=object_repr,                action_flag=DELETION            )

if settings.LOGGING != None:            from django.contrib.admin.models import LogEntry, DELETION            LogEntry.objects.log_action(                user_id=request.user.pk,                content_type_id=ContentType.objects.get_for_model(self.model).pk,                object_id=object.pk,                object_repr=object_repr,                action_flag=DELETION            )

LOGGING  = None#关闭后台日志记录功能

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