python之缩略图现在显示在 django 管理 ListView 中

我已经创建了一个基本的文件上传应用程序，我希望能够在 django 管理 ListView 中查看图像的缩略图。我已经尝试在这篇博文中实现代码 - http://www.acedevs.com/blog/2011/07/11/django-admin-list-view-thumbnails/ ).

添加代码后，我得到了名为“幻灯片缩略图”的额外字段，但是当我上传图像时它只是说“无”，因此它将图像转换为缩略图并显示它。

我没有任何错误，所以不确定我到底哪里出错了..

这是我的代码，希望有人能解释一下。

模型:

从 django.db 导入模型 从 sorl.thumbnail.main 导入 DjangoThumbnail 导入操作系统

class File(models.Model): 
 
 
    CATEGORY_CHOICES = ( 
        ('Image', 'Image'), 
        ('Document', 'Document') 
    ) 
 
    title = models.CharField(max_length=400, help_text="Enter the title of the file, this will appear on the listings page") 
 
 
 
 
    file_type = models.CharField(choices=CATEGORY_CHOICES, help_text="Optional, but will help with filtering on listings page.", max_length=200, blank=True, null=True, default=None) 
 
 
    image_upload = models.ImageField(upload_to="images/filesApp", height_field="image_height", width_field="image_width", blank=True, null=True) 
 
    file_upload = models.FileField(upload_to="pdf/filesApp", blank=True, null=True) 
 
    image_height = models.PositiveIntegerField(null=True, blank=True, editable=False) 
 
    image_width = models.PositiveIntegerField(null=True, blank=True, editable=False) 
 
 
 
    def slide_thumbnail(self, width=300, height=200): 
        if self.image: 
            thumb = DjangoThumbnail(self.image, (width, height)) 
            return '{img src="%s" /}' % thumb.absolute_url 
        return '{img src="/media/img/admin/icon-no.gif" alt="False"}' 
    slide_thumbnail.allow_tags = True 
    def __unicode__(self): 
        return u'Slide: %s - %sx%s' % (self.title, self.image_height, self.image_width) 

管理员.PY

from django.contrib import admin 
from models import * 
 
 
def delete_selected(modeladmin, request, queryset): 
    for element in queryset: 
        element.delete() 
delete_selected.short_description = "Delete selected elements" 
 
class FileAdmin(admin.ModelAdmin): 
    model = File 
    actions = [delete_selected] 
 
    list_display = ('title', 'file_type', 'slide_thumbnail') 
 
admin.site.register(File, FileAdmin) 

谢谢!

请您参考如下方法:

事实证明，我创建缩略图的函数中的变量是错误的。无论如何，如果有人对在 django 管理 ListView 中使用缩略图感兴趣，这是我完成的代码。

模型.py

从 django.db 导入模型 从 sorl.thumbnail.main 导入 DjangoThumbnail 导入操作系统

类文件(模型.模型):

CATEGORY_CHOICES = ( 
    ('Image', 'Image'), 
    ('Document', 'Document') 
) 
 
title = models.CharField(max_length=400, help_text="Enter the title of the file, this will appear on the listings page") 
 
 
 
 
file_type = models.CharField(choices=CATEGORY_CHOICES, help_text="Optional, but will help with filtering on listings page.", max_length=200, blank=True, null=True, default=None) 
 
 
image_upload = models.ImageField(upload_to="images/filesApp", height_field="image_height", width_field="image_width", blank=True, null=True) 
 
file_upload = models.FileField(upload_to="pdf/filesApp", blank=True, null=True) 
 
image_height = models.PositiveIntegerField(null=True, blank=True, editable=False) 
 
image_width = models.PositiveIntegerField(null=True, blank=True, editable=False) 
 
 
 
def slide_thumbnail(self, width=300, height=200): 
    if self.image_upload: 
        thumb = DjangoThumbnail(self.image_upload, (width, height)) 
        return '<img src="%s" />' % thumb.absolute_url 
    return '{img src="/media/img/admin/icon-no.gif" alt="False"}' 
slide_thumbnail.allow_tags = True 
 
def __unicode__(self): 
    return u'File: %s - %sx%s' % (self.title, self.image_height, self.image_width) 

管理员.py

from django.contrib import admin 
from models import * 
 
 
def delete_selected(modeladmin, request, queryset): 
    for element in queryset: 
        element.delete() 
delete_selected.short_description = "Delete selected elements" 
 
class FileAdmin(admin.ModelAdmin): 
    model = File 
    actions = [delete_selected] 
 
    list_display = ('title', 'file_type', 'slide_thumbnail') 
 
admin.site.register(File, FileAdmin) 

请注意:您需要安装 sorl-thumbnail。

希望这能让任何人免去我必须经历的痛苦!