Django - 显示图像和图像链接

I am having problems getting images and image links to display. I have a model method ('thumbnail_') that is supposed to display a thumbnail that is the link the the full size image. It is not rendering to the webpage (image.html). What am I doing wrong? Thank you.

我在显示图像和图像链接时遇到问题。我有一个模型方法('thumbnail_'),它应该显示一个缩略图,它是全尺寸图像的链接。它不会呈现给网页(image.html)。我究竟做错了什么?谢谢。

model.py

class Image(models.Model):
    title = models.CharField(max_length=60, blank=True, null=True)
    image = models.ImageField(upload_to="images/", blank=True, null=True)
    thumbnail = models.ImageField(upload_to="images/", blank=True, null=True)
    thumbnail2 = models.ImageField(upload_to="images/", blank=True, null=True)
    #tags = models.ManyToManyField(Tag, blank=True)
    #albums = models.ManyToManyField(Album, blank=True)
    created = models.DateTimeField(auto_now_add=True)
    #rating = models.IntegerField(default=50)
    width = models.IntegerField(blank=True, null=True)
    height = models.IntegerField(blank=True, null=True)
    listings = models.ForeignKey(Listings)

def save(self, *args, **kwargs):
    # Save image dimensions
    super(Image, self).save(*args, **kwargs)
    im = PImage.open(pjoin(MEDIA_ROOT, self.image.name))
    self.width, self.height = im.size

    # large thumbnail
    fn, ext = os.path.splitext(self.image.name)
    im.thumbnail((256,256), PImage.ANTIALIAS)
    thumb_fn = fn + "-thumb2" + ext
    tf2 = NamedTemporaryFile()
    im.save(tf2.name, "JPEG")
    self.thumbnail2.save(thumb_fn, File(open(tf2.name)), save=False)
    tf2.close()

    # small thumbnail
    im.thumbnail((60,60), PImage.ANTIALIAS)
    thumb_fn = fn + "-thumb" + ext
    tf = NamedTemporaryFile()
    im.save(tf.name, "JPEG")
    self.thumbnail.save(thumb_fn, File(open(tf.name)), save=False)
    tf.close()

    super(Image, self).save(*args, **kwargs)


def size(self):
    # Image size #
    return "%s x %s" % (self.width, self.height)

def thumbnail_(self):
    return """<a href = "/media/%s"><img border="0" alt="" src="/media/%s" /></a>""" % (
                                                        (self.image.name, self.thumbnail.name))
thumbnail_.allow_tags = True

def __unicode__(self):
    return self.image.name

view.py

def image(request):
    image = Image.objects.values('id', 'title', 'thumbnail_')
    context = {
        'image' : image,
    }
    return render_to_response('bsmain/image.html', context)

image.html

<TABLE id="some_id">    
<TBODY>
    {% load humanize %}
    {% for row in image %}
    <tr>
        <td>{{ row.id }}</td>
        <td>{{ row.title}}</td>
        <td>{{ row.thumbnail_}}</td>            
    </tr>
    {% endfor %}
</TBODY>

2 个解决方案

#1

I'm surprised you get anything at all. This line in your view:

我很惊讶你得到任何东西。您在视图中的这一行:

image = Image.objects.values('id', 'title', 'thumbnail_')

is not allowed, because thumbnail_ is not a field, it is a method on the Image class. values operates only on fields, returning a queryset containing dicts of those names. Even if you used the actual field, thumbnail, in the values call, the template would still not output correctly, as the thumbnail_ method does not exist on the dict that is returned by values.

不允许,因为thumbnail_不是字段,它是Image类的一个方法。 values仅对字段起作用,返回包含这些名称的dicts的查询集。即使您在值调用中使用了实际字段缩略图,模板仍然无法正确输出,因为在值返回的字典中不存在thumbnail_方法。

The simple solution is to use a standard Image.objects.all() call here - trying to limit the number of fields returned is over-optimization.

简单的解决方案是在此处使用标准的Image.objects.all()调用 - 尝试限制返回的字段数量是过度优化。

(Also, please try and give your method a nicer name: something like render_thumbnail would be better than just thumbnail_.)

(另外,请尝试给你的方法一个更好的名字:像render_thumbnail这样的东西比只有thumbnail_更好。)

#2

I can't see any attribute named thumbnail_:

我看不到任何名为thumbnail_的属性:

image = Image.objects.values('id', 'title', 'thumbnail_')

and

thumbnail = models.ImageField(upload_to="images/", blank=True, null=True)
thumbnail2 = models.ImageField(upload_to="images/", blank=True, null=True)

Check if the image is in correct directory.

检查图像是否在正确的目录中。

#1