Question

使用FileField，ImageField的Django项目表单。一切都很好，但是当引发ValidationError时，我必须重新选择所有文件和图像。我想通过django中的缓存概念来避免这个问题但我没有获得当前输出请更正此代码并添加（如果有的话）

-models.py

from __future__ import unicode_literals
from django.db import models
# Create your models here.
from django.db import models
from django.db.models import ImageField
# or if you use sorl-thumbnail
# from sorl.thumbnail.fields import ImageField

import os

def resume_path(instance, filename):
    fn, ext = os.path.splitext(filename)
    return "resumes/{id}{ext}".format(id=instance.title, ext=ext)

class Page(models.Model):
    title = models.CharField(max_length=100)
    content = models.TextField()
    image =  ImageField(upload_to=resume_path)

-admin.py

from django.contrib import admin
# Register your models here.
from django.contrib import admin
from file_resubmit.admin import AdminResubmitMixin
from .models import Page

from django.forms import ModelForm
from file_resubmit.admin import AdminResubmitImageWidget, 

AdminResubmitFileWidget
from .models import Page

class PageModelForm(ModelForm):

class Meta:
         model = Page
         widgets = {
             'picture': AdminResubmitImageWidget,
             'file': AdminResubmitFileWidget,
         }
         fields = '__all__'

class PageAdmin(admin.ModelAdmin,AdminResubmitMixin):
    form = PageModelForm

admin.site.register(Page, PageAdmin)

-settings.py

    CACHES = {
             'default': {
                 'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
             },
             "file_resubmit": {
                 'BACKEND': 'django.core.cache.backends.filebased.FileBasedCache',
                  "LOCATION": '/home/xxxxxx/Downloads/Python/Projects_Python/pleasecome/tmp/file_resubmit',
                # "LOCATION": os.path.join(BASE_DIR,'tmp/file_resubmit/'),
             },
    }

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'sub',
    'file_resubmit',
]

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

Answer 1

问题可能在于课程PageAdmin

class PageAdmin(admin.ModelAdmin,AdminResubmitMixin):
    form = PageModelForm

根据django-form-resubmit的文档，应该以下列方式之一创建ModelAdmin：

class PageAdmin(admin.ModelAdmin):
    form = PageModelForm

class PageAdmin(AdminResubmitMixin, admin.ModelAdmin):
    pass

您声明父类的顺序很重要，因此您应该遵循官方示例。由于您有自定义表单，因此根本不需要使用AdminResubmitMixin。

在Django中验证错误后重新提交FileField中的文件

1 个答案: