"Foreign key not available on object"（在对象上无法使用外键）

非常初级的问题困扰着我。我有一个问题无法在模板中显示外键ArtWorkImages，所以我想在视图中调试它，但外键ArtworkImage在Artwork上不可用：

我的模型：

from django.db import models
class Artwork(models.Model):
    title = models.CharField(max_length=200)
    body = models.TextField()
    created_at = models.DateTimeField(auto_now_add=True)
    def __unicode__(self):
        return self.title
class ArtworkImage(models.Model):
    property = models.ForeignKey(Artwork, related_name='images')
    image = models.ImageField(upload_to = "images/")

视图：

from django.shortcuts import render
from erikheide.models import Artwork
from erikheide.models import ArtworkImage
def index(request):
    artworks = Artwork.objects.all()[:5]
    artwork = artworks[0]
    images = artwork.artworkimage_set.all()
    context = {'latest_poll_list': artworks}
    return render(request, 'index.html', context)

错误：

> Traceback (most recent call last):   File
> "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py",
> line 115, in get_response
>     response = callback(request, *callback_args, **callback_kwargs)   File "/home/fhp/Hentede filer/tastypie/django15/erikheide/views.py",
> line 13, in index
>     images = artwork.artworkimage_set.all() AttributeError: 'Artwork' object has no attribute 'artworkimage_set'

未能正常工作的模板（没有图片显示）

{% if artworks %}

• {% for artwork in artworks %}
  • {{ artwork.body}}

{% for image in artwork.images_set.all %} {% endfor %} {% endfor %}

{% else %}

No artworks are available.

{% endif %}