AttributeError: 'str' 对象没有 'fields' 属性，使用 Django 非关系型数据库在 GAE 上
我正在用Django做一个应用程序，使用的是Google App Engine，并且我在用Bootstrap...为了在Django表单中使用Bootstrap，我安装了django_forms_bootstrap（https://github.com/pinax/django-forms-bootstrap）
问题是...当我在GAE上部署并尝试创建一个新用户（注册）时，我遇到了服务器错误（500），不过新用户还是被创建了...GAE的日志显示了这个：
> Exception in request: Traceback (most recent call last): File
> "/base/data/home/apps/s~softsystemanager/1.378394621720949564/django/core/handlers/base.py",
> line 113, in get_response
> response = callback(request, *callback_args, **callback_kwargs) File
> "/base/data/home/apps/s~softsystemanager/1.378394621720949564/myapp/modulos/presentacion/views.py",
> line 32, in signup_view
> return render_to_response('presentacion/login.html', context_instance=RequestContext(request)) File
> "/base/data/home/apps/s~softsystemanager/1.378394621720949564/django/shortcuts/__init__.py",
> line 29, in render_to_response
> return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs) File "/base/data/home/apps/s~softsystemanager/1.378394621720949564/django/template/loader.py",
> line 177, in render_to_string
> return t.render(context_instance) File "/base/data/home/apps/s~softsystemanager/1.378394621720949564/django/template/base.py",
> line 140, in render
> return self._render(context) File "/base/data/home/apps/s~softsystemanager/1.378394621720949564/django/template/base.py",
> line 134, in _render
> return self.nodelist.render(context) File "/base/data/home/apps/s~softsystemanager/1.378394621720949564/django/template/base.py",
> line 830, in render
> bit = self.render_node(node, context) File "/base/data/home/apps/s~softsystemanager/1.378394621720949564/django/template/base.py",
> line 844, in render_node
> return node.render(context) File "/base/data/home/apps/s~softsystemanager/1.378394621720949564/django/template/loader_tags.py",
> line 124, in render
> return compiled_parent._render(context) File "/base/data/home/apps/s~softsystemanager/1.378394621720949564/django/template/base.py",
> line 134, in _render
> return self.nodelist.render(context) File "/base/data/home/apps/s~softsystemanager/1.378394621720949564/django/template/base.py",
> line 830, in render
> bit = self.render_node(node, context) File "/base/data/home/apps/s~softsystemanager/1.378394621720949564/django/template/base.py",
> line 844, in render_node
> return node.render(context) File "/base/data/home/apps/s~softsystemanager/1.378394621720949564/django/template/loader_tags.py",
> line 63, in render
> result = block.nodelist.render(context) File "/base/data/home/apps/s~softsystemanager/1.378394621720949564/django/template/base.py",
> line 830, in render
> bit = self.render_node(node, context) File "/base/data/home/apps/s~softsystemanager/1.378394621720949564/django/template/base.py",
> line 844, in render_node
> return node.render(context) File "/base/data/home/apps/s~softsystemanager/1.378394621720949564/django/template/base.py",
> line 881, in render
> output = self.filter_expression.resolve(context) File "/base/data/home/apps/s~softsystemanager/1.378394621720949564/django/template/base.py",
> line 606, in resolve
> new_obj = func(obj, *arg_vals) File "/base/data/home/apps/s~softsystemanager/1.378394621720949564/django_forms_bootstrap/templatetags/bootstrap_tags.py",
> line 20, in as_bootstrap
> form = _preprocess_fields(form) File "/base/data/home/apps/s~softsystemanager/1.378394621720949564/django_forms_bootstrap/templatetags/bootstrap_tags.py",
> **line 10, in _preprocess_fields
> for field in form.fields: AttributeError: 'str' object has no attribute 'fields'**
然后我去看bootstrap_tags.py文件，发现没有错误
> def _preprocess_fields(form):
> for field in form.fields:
> name = form.fields[field].widget.__class__.__name__.lower()
> if not name.startswith("radio") and not name.startswith("checkbox"):
> form.fields[field].widget.attrs["class"] = " form-control"
> return form
>
>
> @register.filter def as_bootstrap(form):
> template = get_template("bootstrap/form.html")
> form = _preprocess_fields(form)
>
> c = Context({
> "form": form,
> })
> return template.render(c)
在我的应用的HTML文件中，我得到了这个
<div class="col-md-4 ">
<form action="." method="POST">
{%csrf_token%}
{{ form|as_bootstrap}}
<button type="submit" class="btn btn-default">Sign UP</button>
</form>
</div>
</div>
我不知道这是否有用，但这是表单的内容
class RegisterForm(forms.Form):
username = forms.CharField(label="Nombre de Usuario",widget=forms.TextInput())
name = forms.CharField(label="Nombre",widget=forms.TextInput())
last_name = forms.CharField(label="Apellido",widget=forms.TextInput())
email = forms.EmailField(label="Correo Electronico", widget=forms.TextInput())
password_one = forms.CharField(label="Password", widget=forms.PasswordInput(render_value=False))
password_two = forms.CharField(label="Confirmar Password", widget=forms.PasswordInput(render_value=False))
实际上，错误就是出在这个特定的表单上，因为我还有另一个表单，登录表单，它工作得很好，我用的也是同样的方法来使用django_forms_bootstrap
我的signup_view的源代码是：
def signup_view(request):
form = RegisterForm()
if request.method == "POST":
form = RegisterForm(request.POST)
if form.is_valid():
username = form.cleaned_data['username']
name = form.cleaned_data['name']
last_name = form.cleaned_data['last_name']
email = form.cleaned_data['email']
password_one = form.cleaned_data['password_one']
password_two = form.cleaned_data['password_two']
newUser = User.objects.create_user(username=username, first_name=name, last_name=last_name, email=email, password=password_one)
newUser.save()
return render_to_response('presentacion/login.html', context_instance=RequestContext(request))
else:
ctx = {'form':form}
return render_to_response('presentacion/sign_up.html',ctx, context_instance=RequestContext(request))
ctx = {'form':form}
return render_to_response('presentacion/sign_up.html',ctx, context_instance=RequestContext(request))
请帮帮我！！！
2 个回答
7
如果你和我一样遇到了类似的错误，在Django 2.2.4中，使用 as_table|crispy 似乎根本不起作用。解决办法是去掉 as_table：
之前
<div class="col-md-4 ">
<form action="." method="POST">
{%csrf_token%}
{{ form.as_table|as_bootstrap}}
<button type="submit" class="btn btn-default">Sign UP</button>
</form>
</div>
之后
<div class="col-md-4 ">
<form action="." method="POST">
{%csrf_token%}
{{ form|as_bootstrap}}
<button type="submit" class="btn btn-default">Sign UP</button>
</form>
</div>
这可能不能直接回答提问者的问题，但如果你和我一样来到这里，希望这个信息能对你有所帮助。
5
在你的 login.html 模板中，你使用了 {{ form|as_bootstrap }}，但是在你处理注册的代码里，你渲染了登录的模板，却没有传入表单的值：
return render_to_response('presentacion/login.html',
context_instance=RequestContext(request))
这里没有上下文信息。
你需要通过将用户重定向到登录的 视图 来解决这个问题，而不是从注册视图中渲染登录的 模板。
另外，你应该使用 render 快捷方式，这样会自动发送 RequestContext。
你还没有检查是否有重复的用户。
要解决这些问题，你需要在代码中做以下修改：
from django.shortcuts import render, redirect
def signup_view(request):
form = RegisterForm(request.POST or None)
ctx = {'form': form}
if request.method == "POST":
if form.is_valid():
username = form.cleaned_data['username']
name = form.cleaned_data['name']
last_name = form.cleaned_data['last_name']
email = form.cleaned_data['email']
password_one = form.cleaned_data['password_one']
password_two = form.cleaned_data['password_two']
if not User.objects.filter(email=email).exists():
newUser = User.objects.create_user(username=username,
first_name=name,
last_name=last_name,
email=email,
password=password_one)
newUser.save()
else:
# Do something, because a user
# with this email already exists
pass
return redirect('login')
return render(request, 'presentacion/sign_up.html', ctx)