Django:更改管理文件字段输出？

我制作了一个模型，其中的文件上载到自定义路径（不在MEDIA_根目录下）。所以它是一种类似受保护的文件。 现在我需要更改它在管理细节中的表示。它显示了相对于媒体URL的路径。我需要改变这一点，向生成正确URL的应用程序视图显示URL

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那么，显示链接的最佳方式是什么，并且只能在admin的对象详细信息中显示？

以下是我的做法：

型号.py

class SecureFile(models.Model):
    upload_storage = FileSystemStorage(
        location=settings.ABS_DIR('secure_file/files/'))

    secure_file = models.FileField(verbose_name=_(u'file'),
                                   upload_to='images', storage=upload_storage)

from django import forms
from django.utils.translation import ugettext_lazy as _
from django.core.urlresolvers import reverse
from django.utils.safestring import mark_safe


class AdminFileWidget(forms.FileInput):
    """A FileField Widget that shows secure file link"""
    def __init__(self, attrs={}):
        super(AdminFileWidget, self).__init__(attrs)

    def render(self, name, value, attrs=None):
        output = []
        if value and hasattr(value, "url"):
            url = reverse('secure_file:get_secure_file',
                          args=(value.instance.slug, ))
            out = u'<a href="{}">{}</a><br />{} '
            output.append(out.format(url, _(u'Download'), _(u'Change:')))
        output.append(super(AdminFileWidget, self).render(name, value, attrs))
        return mark_safe(u''.join(output))

class SecureFileAdminForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(SecureFileAdminForm, self).__init__(*args, **kwargs)
        self.fields['secure_file'].widget = AdminFileWidget()

    class Meta:
        model = SecureFile


class SecureFileAdmin(admin.ModelAdmin):
    form = SecureFileAdminForm

widgets.py

class SecureFile(models.Model):
    upload_storage = FileSystemStorage(
        location=settings.ABS_DIR('secure_file/files/'))

    secure_file = models.FileField(verbose_name=_(u'file'),
                                   upload_to='images', storage=upload_storage)

from django import forms
from django.utils.translation import ugettext_lazy as _
from django.core.urlresolvers import reverse
from django.utils.safestring import mark_safe


class AdminFileWidget(forms.FileInput):
    """A FileField Widget that shows secure file link"""
    def __init__(self, attrs={}):
        super(AdminFileWidget, self).__init__(attrs)

    def render(self, name, value, attrs=None):
        output = []
        if value and hasattr(value, "url"):
            url = reverse('secure_file:get_secure_file',
                          args=(value.instance.slug, ))
            out = u'<a href="{}">{}</a><br />{} '
            output.append(out.format(url, _(u'Download'), _(u'Change:')))
        output.append(super(AdminFileWidget, self).render(name, value, attrs))
        return mark_safe(u''.join(output))

class SecureFileAdminForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(SecureFileAdminForm, self).__init__(*args, **kwargs)
        self.fields['secure_file'].widget = AdminFileWidget()

    class Meta:
        model = SecureFile


class SecureFileAdmin(admin.ModelAdmin):
    form = SecureFileAdminForm