django - 在django中上传图片时出错: "coercing to Unicode: need string or buffer, tuple found"

Question

尝试在 django 中使用ImageField。这是我的模型

class Album(models.Model):
    title = models.CharField(max_length=100)

    def __unicode__(self):
        return self.title

class Photo(models.Model):
    image = models.ImageField(upload_to='photos/')
    album = models.ForeignKey(Album)
    title = models.CharField(max_length=100, default="")

    def __unicode__(self):
        return self.title

class PhotoModelForm(forms.ModelForm):
    class Meta:
        model = Photo

这是urls.py的一部分

...
url(r'^trial/upload/$', 'trial.views.upload'),
...

views.py

def upload(request):
    if request.method == 'POST':
        form = PhotoModelForm(request.POST, request.FILES)
        if form.is_valid():
            photo = form.save()
            return render_to_response('trial/thanks_upload.html',{
                'photo': photo
            }, context_instance = RequestContext(request))
    else:
        form = PhotoModelForm()
    return render_to_response('trial/upload.html', {
      'form': form
    }, context_instance = RequestContext(request))

上传.html

<form enctype="multipart/form-data" action="/trial/upload/" method="post">
    {% csrf_token %}
    {% for field in form %}
        <div class="fieldWrapper">
            {{ field.errors }}
            {{ field.label_tag }}: {{ field }}
        </div>
    {% endfor %}
    <p><input type="submit" value="Upload" /></p>
</form>

但是在保存时出现下一个错误:/试用/上传/处出现类型错误强制转换为 Unicode:需要字符串或缓冲区，找到元组

photo.save 上出现错误

有人知道为什么会这样吗？为什么会出现元组？我确信有一个愚蠢的错误......

Answer 1

我自己已经拿到了。在settings.py中有MEDIA_ROOT设置，即

MEDIA_ROOT = 'd:/dev/python/scripts/app/media/',

Python 由于末尾有逗号而将对象创建为元组。这就是它无法保存该对象的原因。下次注意你的逗号!