Question

我在models.py中使用下面的类来限制文件上传到某些文件扩展名。

class ExtensionValidator(RegexValidator):
    def __init__(self, extensions, message=None):
        if not hasattr(extensions, '__iter__'):
            extensions = [extensions]
        regex = '\.(%s)$' % '|'.join(extensions)
        if message is None:
            message = 'File type not supported. Accepted types are: %s.' % ', '.join(extensions)
        super(ExtensionValidator, self).__init__(regex, message)

    def __call__(self, value):
        super(ExtensionValidator, self).__call__(value.name)

以下是调用它的模型形式：

class Product(models.Model):
    user = models.ForeignKey(User)
    name = models.CharField(max_length=100)
    description = models.CharField(max_length=300)
    price = models.DecimalField(max_digits=10, decimal_places=2)
    url = models.CharField(max_length=200, blank=True)
    product_type = models.CharField(max_length=15, choices=product_types, default='choose')
    image = models.ImageField(upload_to='product_images', blank=True, null=True)
    image_url = models.CharField(max_length=200, blank=True)
    product_file = models.FileField(upload_to='product_files', validators=[ExtensionValidator(['jpg', 'jpeg', 'png', 'zip'])], blank=True, null=True)
    likes = models.IntegerField(default=0)

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return reverse('index', kwargs={})

我已经过测试，但功能正常，但是当用户提交表单时，错误消息不会显示。对于我正在使用include - form.html的所有表单：

{% load widget_tweaks %}

{% for hidden_field in form.hidden_fields %}
  {{ hidden_field }}
{% endfor %}

{% if form.non_field_errors %}
  <div class="alert alert-danger" role="alert">
    {% for error in form.non_field_errors %}
      {{ error }}
    {% endfor %}
  </div>
{% endif %}

{% for field in form.visible_fields %}
  <div class="form-group">
    {{ field.label_tag }}

    {% if form.is_bound %}
      {% if field.errors %}
        {% render_field field class="form-control is-invalid" %}
        {% for error in field.errors %}
          <div class="invalid-feedback">
            {{ error }}
          </div>
        {% endfor %}
      {% else %}
        {% render_field field class="form-control is-valid" %}
      {% endif %}
    {% else %}
      {% render_field field class="form-control" %}
    {% endif %}

    {% if field.help_text %}
      <small class="form-text text-muted">{{ field.help_text }}</small>
    {% endif %}
  </div>
{% endfor %}

我猜我需要在form.html中添加一些内容来显示错误消息，但不确定是什么或在哪里。我还在研究这个，但任何指导都会感激不尽。

修改：

根据要求，这是表单类：

class ProductForm(forms.ModelForm):
    class Meta:
        model = Product
        fields = ['name', 'description', 'url', 'product_type', 'price', 'image', 'image_url', 'product_file']
        labels = {
            'name': 'Product Name',
            'url': 'Product URL',
            'product_type': 'Product Type',
            'description': 'Product Description',
            'image': 'Product Image',
            'image_url': 'Product Image URL',
            'price': 'Product Price',
            'product_file': 'Product File',
        }
        widgets = {
            'description': Textarea(attrs={'rows': 5}),
        }

编辑2 ：

...这是HTML：

    <div class="product card card-default">
      <div class="card-header">
        <h3 class="card-title mb-4">Add Product</h3>
      </div>
      <div class="card-body">
        <form enctype="multipart/form-data" action="post_url/" method="post" >
          {% csrf_token %}
                {% include 'includes/form.html' with form=form %}
          <input class="btn btn-product" type="submit" value="Upload" />
        </form>
      </div>
    </div>

django模型表单RegexValidator错误消息未显示

0 个答案: