Django文件未上载：ValueError at/The'image'属性没有与i关联的文件

Environment: Request Method: GET Request URL: http://127.0.0.1:8000/ Django Version: 2.2.5 Python Version: 3.7.3 Installed Applications: ['django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'users.apps.UsersConfig', 'product.apps.ProductConfig'] Installed Middleware: ['django.middleware.security.SecurityMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.common.CommonMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware', 'django.middleware.clickjacking.XFrameOptionsMiddleware'] Template error: In template /home/asad/PycharmProjects/eShop/templates/base.html, error at line 8 The 'image' attribute has no file associated with it. 1 : {% load staticfiles %} 2 : <!DOCTYPE html> 3 : <html lang="en"> 4 : <head> 5 : <meta charset="UTF-8"> 6 : <title>{% block title %}{% endblock %}</title> 7 :  8 : <link rel="stylesheet" href="https://maxcd n.bootstrapcdn.com/ bootstrap/4.3.1/css/bootstrap.min.css"> 9 : 10 : 11 : </head> 12 : <body> 13 : 14 : <div class="container"> 15 : <div class="row"> 16 : <div class="col-md-4"> 17 : <a href="{% url 'product:home' %}">Logo</a> 18 : </div> Traceback: File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/base.py" in _resolve_lookup 829. current = current[bit] During handling of the above exception ('ImageFieldFile' object is not subscriptable), another exception occurred: File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/core/handlers/exception.py" in inner 34. response = get_response(request) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/core/handlers/base.py" in _get_response 115. response = self.process_exception_by_middleware(e, request) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/core/handlers/base.py" in _get_response 113. response = wrapped_callback(request, *callback_args, **callback_kwargs) File "/home/asad/PycharmProjects/eShop/product/views.py" in product_list 12. return render(request, 'product/home.html', context) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/shortcuts.py" in render 36. content = loader.render_to_string(template_name, context, request, using=using) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/loader.py" in render_to_string 62. return template.render(context, request) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/backends/django.py" in render 61. return self.template.render(context) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/base.py" in render 171. return self._render(context) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/base.py" in _render 163. return self.nodelist.render(context) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/base.py" in render 937. bit = node.render_annotated(context) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/base.py" in render_annotated 904. return self.render(context) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/loader_tags.py" in render 150. return compiled_parent._render(context) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/base.py" in _render 163. return self.nodelist.render(context) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/base.py" in render 937. bit = node.render_annotated(context) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/base.py" in render_annotated 904. return self.render(context) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/loader_tags.py" in render 62. result = block.nodelist.render(context) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/base.py" in render 937. bit = node.render_annotated(context) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/base.py" in render_annotated 904. return self.render(context) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/defaulttags.py" in render 209. nodelist.append(node.render_annotated(context)) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/base.py" in render_annotated 904. return self.render(context) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/base.py" in render 987. output = self.filter_expression.resolve(context) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/base.py" in resolve 671. obj = self.var.resolve(context) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/base.py" in resolve 796. value = self._resolve_lookup(context) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/template/base.py" in _resolve_lookup 837. current = getattr(current, bit) File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/db/models/fields/files.py" in url 61. self._require_file() File "/home/asad/PycharmProjects/eShop/venv/lib/python3.7/site-packages/django/db/models/fields/files.py" in _require_file 38. raise ValueError("The '%s' attribute has no file associated with it." % self.field.name) Exception Type: ValueError at / Exception Value: The 'image' attribute has no file associated with it.

class Product(models.Model): user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True, blank=True) name = models.CharField(max_length=200) image = models.ImageField(upload_to='product/', default='product.png') quantity = models.IntegerField(default=0) purchase_price = models.FloatField() sales_price = models.FloatField() product_type = models.CharField(max_length=2, choices=PRODUCT_TYPE) measure = models.ForeignKey(Measure, on_delete=models.CASCADE) created_at = models.DateTimeField(auto_now_add=True) updated_at = models.DateTimeField(auto_now=True)

class ProductForms(forms.Form): name = forms.CharField(max_length=200, widget=forms.TextInput( attrs={ 'class': 'form-control', } )) image = forms.ImageField(required=False, widget=forms.FileInput( attrs={ 'class': 'form-control', } )) quantity = forms.IntegerField(widget=forms.NumberInput(attrs={'class': 'form-control'})) purchase_price = forms.FloatField(widget=forms.NumberInput(attrs={'class': 'form-control'})) sales_price = forms.FloatField(widget=forms.NumberInput(attrs={'class': 'form-control'})) product_type = forms.ChoiceField(choices=PRODUCT_TYPE, widget=forms.Select(attrs={'class': 'form-control'})) measure = forms.ModelChoiceField(queryset=Measure.objects.all(), widget=forms.Select(attrs={'class': 'form-control'}))

def create_product(request): if request.method == 'POST': form = ProductForms(request.POST, request.FILES or None) print(request.FILES) if form.is_valid(): data = form.cleaned_data product = Product.objects.create( user=request.user, name=data['name'], image=data['image'], quantity=data['quantity'], purchase_price=data['purchase_price'], sales_price=data['sales_price'], product_type=data['product_type'], measure=data['measure'], ) product.save() messages.success(request, 'Form is successfully submitted') else: messages.warning(request, 'Form is not submitted') form = ProductForms() return render(request, 'product/product_create.html', {'form': form,})

<form action="" class="was-validated" method="post"> {% csrf_token %} {% for field in form.visible_fields %} <div class="form-group"> {{ field.label_tag }} {{ field }} </div> {% endfor %} <button type="submit" class="btn btn-success">Submit Product</button> </form>

2条回答

网友

1楼 · 编辑于 2024-05-19 21:38:44

您应该将enctype="multipart/form-data"与form标记一起使用。你知道吗

您的模板如下：

<form action="" class="was-validated" method="post" enctype="multipart/form-data">

HTML表单提供三种编码方法：

应用程序/x-www-form-urlencoded（默认）
多部分/窗体数据
文本/纯文本

当表单包含任何<input type="file">元素时，我们使用multipart/form-data。 To know more..

网友

2楼 · 编辑于 2024-05-19 21:38:44

在form标记中添加enctype = "multipart/form-data"，如下所示

<form action="" class="was-validated" method="post" enctype = "multipart/form-data">

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