Question

我在模型表单上上传图片字段时遇到问题。

views.py：

@user_passes_test(lambda x: x.is_superuser)
def add_books(request):
    if request.method == 'POST':
        form = BooksForm(request.POST, request.FILES)
        if form.is_valid():
            form.save()
            redirect('/')
    else:
        form = BooksForm()
    return render(request, 'library/books/addbook.html', {'form': form})

models.py：

class Books(models.Model):
    picture = models.ImageField(upload_to='images/')
    name = models.CharField(max_length=100)
    publisher = models.CharField(max_length=200)
    author = models.CharField(max_length=100)
    member = models.ForeignKey(Member, related_name="books", null=True)

    def get_absolute_url(self):
        return reverse('library:detail_book', kwargs={'book_id': self.id})

    def __unicode__(self):
        return "%s %s" % (self, self.name, self.author)

    def __str__(self):
        return "{0} {1}".format(self.name, self.author)

forms.py：

class BooksForm(ModelForm):
    class Meta:
        model = Books
        fields = ('picture', 'name', 'publisher', 'author')

    def clean_name(self):
        name = self.cleaned_data['name']
        if Books.objects.filter(name=name).exists():
            raise ValidationError("A Book with that name already exists!")
        return name

addbook.html：

{% extends "library/base.html" %}
{% block content %}
    <div align="center">
        <tr>
                <form method="POST">
                {% csrf_token %}
                <h2>Book:</h2>
                {{ form.as_p }}
                <input type="submit" value="submit">
            </form>
        </tr>
    </div>
{% endblock %}

settings.py：

MEDIA_URL = '/media/'
MEDIA_ROOT = os.path.join(BASE_DIR, 'media/')

有一次，我尝试添加一本书，然后添加图像字段并按下按钮，表单告诉我图像字段是必需的，它不允许我上传图像。谢谢你的帮助！

Answer 1

要上传表单中的文件，您需要将以下属性添加到表单元素：

<form method="POST" enctype="multipart/form-data">

没有这个，文件没有被上传，这就是Django的表单API引发错误的原因（因为它是必填字段）。

通过模型表单上传图片时出现问题

1 个答案: