通过django访问模型对象时，从表中删除的对象仍然存在持续存在

Question

我正在使用postgresql后端的django应用程序。我正在使用单独的python脚本访问表（通过django模型）进行一些修改，然后启动修改记录的Web表单。在我的测试中，我已经进入脚本之外的数据库并删除了记录，当我再次运行脚本时，删除的记录仍然存在。为什么会发生这种情况，如何确保每次运行脚本时刷新表格？我试着迭代我正在访问的模型中的对象，并使用object.refresh_from_db()，但这似乎没有任何作用。谁能帮忙？

下面是一个代码片段，其中我试图访问现有的记录：

from django.conf import settings 
    # from update import update_defaults 
    # settings.configure(default_settings=update_defaults, DEBUG=True) 
    os.environ['DJANGO_SETTINGS_MODULE'] = 'mapindex.settings' 
    django.setup() 
    # from django.conf import settings 

from update.models import Mapindex 
for m in Mapindex.objects.all(): 
     m.refresh_from_db() 
     existing_oid_list.append(m.objectid) 
     print m.sheetlabel, m.county, m.status 
     if m.sheetlabel in img_list_shtlbls and m.status == 'Active': 
      print 'setting', m.sheetlabel, 'status to superseded...' 
      print 'superseded objectid =', m.objectid 
      m.status = 'Superseded' 
      m.publish = 'No' 
      m.save() 

什么其他信息将是有益的发布？这是我的settings.py如果是有帮助的：

""" 
Django settings for mapindex project. 

Generated by 'django-admin startproject' using Django 1.11a1. 

For more information on this file, see 
https://docs.djangoproject.com/en/dev/topics/settings/ 

For the full list of settings and their values, see 
https://docs.djangoproject.com/en/dev/ref/settings/ 
""" 

import os 
import sys 

# Build paths inside the project like this: os.path.join(BASE_DIR, ...) 
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__))) 


# Quick-start development settings - unsuitable for production 
# See https://docs.djangoproject.com/en/dev/howto/deployment/checklist/ 

# SECURITY WARNING: keep the secret key used in production secret! 
SECRET_KEY = 'urpz542i6mx*d07dbe&^ko1)u2w+z7n1er=6k913+)3ot89h2d' 

# SECURITY WARNING: don't run with debug turned on in production! 
DEBUG = True 

ALLOWED_HOSTS = [] 


# Application definition 

INSTALLED_APPS = [ 
    'update.apps.UpdateConfig', 
    'django.contrib.admin', 
    'django.contrib.auth', 
    'django.contrib.contenttypes', 
    'django.contrib.sessions', 
    'django.contrib.messages', 
    'django.contrib.staticfiles', 
    'django_windows_tools', 
] 


MIDDLEWARE_CLASSES = [ 
    'django.middleware.security.SecurityMiddleware', 
    'django.contrib.sessions.middleware.SessionMiddleware', 
    'django.middleware.common.CommonMiddleware', 
    'django.middleware.csrf.CsrfViewMiddleware', 
    'django.contrib.auth.middleware.AuthenticationMiddleware', 
    'django.contrib.messages.middleware.MessageMiddleware', 
    'django.middleware.clickjacking.XFrameOptionsMiddleware', 
] 

ROOT_URLCONF = 'mapindex.urls' 

TEMPLATES = [ 
    { 
     'BACKEND': 'django.template.backends.django.DjangoTemplates', 
     'DIRS': [os.path.join(BASE_DIR, 'templates')], 
     'APP_DIRS': True, 
     'OPTIONS': { 
      'context_processors': [ 
       'django.template.context_processors.debug', 
       'django.template.context_processors.request', 
       'django.contrib.auth.context_processors.auth', 
       'django.contrib.messages.context_processors.messages', 
      ], 
     }, 
    }, 
] 

WSGI_APPLICATION = 'mapindex.wsgi.application' 


if 'test' in sys.argv: 
    DATABASES = { 
     'default': { 
      'ENGINE': 'django.db.backends.postgresql_psycopg2', 
      'OPTIONS': { 
       'options': '-c search_path=django,public' 
      }, 
      'NAME': 'rowbasedata', 
      'USER': 'postgres', 
      'PASSWORD': 'pg*admin', 
      'HOST': '10.32.2.193', 
      'PORT': '5432' 
     } 
    } 
else: 
    DATABASES = { 
     'default': { 
      'ENGINE': 'django.db.backends.postgresql_psycopg2', 
      'OPTIONS' : { 
        'options': '-c search_path=django,sde' 
      }, 
      'NAME': 'rowbasedata', 
      'USER': 'postgres', 
      'PASSWORD': 'pg*admin', 
      'HOST': '10.32.2.193', 
      'PORT': '5432' 
     } 
    } 


# Password validation 
# https://docs.djangoproject.com/en/dev/ref/settings/#auth-password-validators 

AUTH_PASSWORD_VALIDATORS = [ 
    { 
     'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator', 
    }, 
    { 
     'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator', 
    }, 
    { 
     'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator', 
    }, 
    { 
     'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator', 
    }, 
] 


# Internationalization 
# https://docs.djangoproject.com/en/dev/topics/i18n/ 

LANGUAGE_CODE = 'en-us' 

TIME_ZONE = 'America/Los_Angeles' 

USE_I18N = True 

USE_L10N = True 

USE_TZ = True 


# Static files (CSS, JavaScript, Images) 
# https://docs.djangoproject.com/en/dev/howto/static-files/ 
STATIC_ROOT = os.path.join(BASE_DIR, 'mapindex', 'static') 
STATIC_URL = '/mapindex/static/' 

Answer 1

如果您需要删除所有/从数据库表中的特定条目，你可以做到这一点通过Django管理面板在admin.py文件中注册您的模型，

首先，通过输入命令来创建超级用户，

python manage.py createsuperuser 

在你admin.py文件，

from django.contrib import admin 

admin.site.register(YourModelName) 

现在，在django管理面板中以超级用户身份登录并删除所需的条目。我希望这有帮助。