Question

我在项目中有两个类 - models 和 models.py中的处方 与外键相关的文件。以下是代码的一部分：

class Photo(models.Model):
    name = models.CharField(max_length=100,null=False)
    photo = models.ImageField(upload_to="photos/",null=True) 

    def photo_tag(self):
        return '<a href="/media/{0}"><img src="/media/{0}"></a>'.format(self.photo)
    photo_tag.short_description = 'Photo of prescription'
    photo_tag.allow_tags = True


class Prescription(models.Model):
    description = models.CharField(max_length=100,null=True)
    photo = models.ForeignKey(Photo, related_name='related_photo',null=True)

    def __str__(self):
        return self.description

我的 Admin.py

class PhotoAdmin(admin.ModelAdmin):
    list_display = ('name', 'photo_tag')
    fields = ('name','photo','photo_tag')     
    readonly_fields = ('photo_tag',)
admin.site.register(Photo,PhotoAdmin)

class PrescriptionAdmin(admin.ModelAdmin):
    list_display = ('get_photo')
    fields = ('photo','description')
    model = Prescription

    def get_photo(self, obj):
        return obj.photo.photo_tag
    get_photo.short_description = 'Photo of prescription'
admin.site.register(Prescription,PrescriptionAdmin)

问题是，当我在处方照片字段中打开处方列表而不是照片时，会显示以下消息。

<bound method Photo.photo_tag of <Photo: Photo object>>

如何在那里描述真实照片？

Answer 1

如果你要用html渲染图像（我猜你是这样的话），你能不能用姜以类似的方式显示描述？

<img src="{{photo.url}" title="{{photo.short_description}}" alt="{{photo.short_description}}">

请注意，我为互联网浏览器添加了alt，它似乎使用了alt而不是标题。

Answer 2

您的方法几乎没有错误的问题。您的photo_tag方法应该是属性方法，或最终cached_property方法。为了安全地显示HTML代码，您应该使用Django提供的方法format_html。

以下是我重构代码的方法：

<强> models.py

from django.db import models
from django.utils.html import format_html
from django.utils.functional import cached_property

class Photo(models.Model):
    name = models.CharField(max_length=100, null=False)
    photo = models.ImageField(upload_to="photos/", null=True)
    # better use blank=True instead of null=True for ImageField

    @cached_property
    def photo_tag(self):
        if self.photo:
            return format_html(
                '<a href="{img}"><img src="{img}"></a>',
                img=self.photo.url
            )
        return None # or better return '' if you use blank=True
    photo_tag.short_description = 'Photo of prescription'


class Prescription(models.Model):
    description = models.CharField(max_length=100, null=True)
    photo = models.ForeignKey(Photo, related_name='related_photo', null=True)

    def __str__(self):
        return self.description

现在，您可以将photo_tag用作Photo的属性，并在管理员中绑定HTML保险箱。

Answer 3

感谢任何试图提供帮助的人。我在@Klaus的帮助下找到了另一个解决方案，他首先回答了我很确定可能还有更好的解决方案。以下是我更改代码的方法

的 Models.py

from django.utils.safestring import mark_safe class Photo(models.Model): name = models.CharField(max_length=100,null=False) photo = models.ImageField(upload_to="photos/",null=True) def photo_tag(self): return mark_safe('<a href="/media/{0}"><img src="/media/{0}"></a>'.format(self.photo)) photo_tag.short_description = 'Photo of prescription' photo_tag.allow_tags = True class Prescription(models.Model): description = models.CharField(max_length=100,null=True) photo = models.ForeignKey(Photo, related_name='related_photo',null=True) def __str__(self): return self.description

<强> Admin.py

class PhotoAdmin(admin.ModelAdmin): list_display = ('name', 'photo_tag') fields = ('name','photo','photo_tag') readonly_fields = ('photo_tag',) admin.site.register(Photo,PhotoAdmin) class PrescriptionAdmin(admin.ModelAdmin): list_display = ('get_photo') fields = ('photo','description') model = Prescription def get_photo(self, obj): return obj.photo.photo_tag() get_photo.short_description = 'Photo of prescription' admin.site.register(Prescription,PrescriptionAdmin)

在Django的Admin Panel中显示ForeignKey的图像

3 个答案: