'str'对象没有属性'field'使用widget_tweaks

Question

这个问题已经出现了很多次，但都缩小到了各自的具体问题。我希望这个问题能更多地澄清这个问题，这样它会变得更普遍地有用，而不仅仅局限于我的问题。

我得到错误'str' object has no attribute 'field'

我得到了以下代码

template.html
{% load widget_tweaks %}
<form action="." method="POST">
{% render_field form.co_nip_number name="co_nip_number" class="form-control" type="number" required="" %}
</form>

forms.py
from django import forms
from .models import BusinessContact

class BusinessContactForm(forms.Form):
class Meta:
model = BusinessContact
fields = 'co_nip_number'

models.py
from django.db import models
class BusinessContact(models.Model):
co_nip_number = models.CharField(max_length=10)

urls.py
from django.urls import path
from . import views
app_name = 'dashboard'
urlpatterns = [
path('new-client/', views.NewClient.as_view(), name='new-client'),
]

views.py
from django.views.generic import FormView
from django.http import HttpResponse
from .forms import BusinessContactForm

class NewClient(FormView):
template_name = 'dashboard/new-client.html'
form_class = BusinessContactForm
def form_valid(self, form):
form.save()
return HttpResponse('You managed')

TRACEBACK
Traceback (most recent call last):
File "/Users/jannicklangkjaer/PycharmProjects/penge/venv/lib/python3.8/site-packages/django/core/handlers/exception.py", line 34, in inner
response = get_response(request)
File "/Users/jannicklangkjaer/PycharmProjects/penge/venv/lib/python3.8/site-packages/django/core/handlers/base.py", line 145, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/Users/jannicklangkjaer/PycharmProjects/penge/venv/lib/python3.8/site-packages/django/core/handlers/base.py", line 143, in _get_response
response = response.render()
File "/Users/jannicklangkjaer/PycharmProjects/penge/venv/lib/python3.8/site-packages/django/template/response.py", line 105, in render
self.content = self.rendered_content
File "/Users/jannicklangkjaer/PycharmProjects/penge/venv/lib/python3.8/site-packages/django/template/response.py", line 83, in rendered_content
return template.render(context, self._request)
File "/Users/jannicklangkjaer/PycharmProjects/penge/venv/lib/python3.8/site-packages/django/template/backends/django.py", line 61, in render
return self.template.render(context)
File "/Users/jannicklangkjaer/PycharmProjects/penge/venv/lib/python3.8/site-packages/django/template/base.py", line 171, in render
return self._render(context)
File "/Users/jannicklangkjaer/PycharmProjects/penge/venv/lib/python3.8/site-packages/django/template/base.py", line 163, in _render
return self.nodelist.render(context)
File "/Users/jannicklangkjaer/PycharmProjects/penge/venv/lib/python3.8/site-packages/django/template/base.py", line 936, in render
bit = node.render_annotated(context)
File "/Users/jannicklangkjaer/PycharmProjects/penge/venv/lib/python3.8/site-packages/django/template/base.py", line 903, in render_annotated
return self.render(context)
File "/Users/jannicklangkjaer/PycharmProjects/penge/venv/lib/python3.8/site-packages/django/template/loader_tags.py", line 150, in render
return compiled_parent._render(context)
File "/Users/jannicklangkjaer/PycharmProjects/penge/venv/lib/python3.8/site-packages/django/template/base.py", line 163, in _render
return self.nodelist.render(context)
File "/Users/jannicklangkjaer/PycharmProjects/penge/venv/lib/python3.8/site-packages/django/template/base.py", line 936, in render
bit = node.render_annotated(context)
File "/Users/jannicklangkjaer/PycharmProjects/penge/venv/lib/python3.8/site-packages/django/template/base.py", line 903, in render_annotated
return self.render(context)
File "/Users/jannicklangkjaer/PycharmProjects/penge/venv/lib/python3.8/site-packages/django/template/loader_tags.py", line 62, in render
result = block.nodelist.render(context)
File "/Users/jannicklangkjaer/PycharmProjects/penge/venv/lib/python3.8/site-packages/django/template/base.py", line 936, in render
bit = node.render_annotated(context)
File "/Users/jannicklangkjaer/PycharmProjects/penge/venv/lib/python3.8/site-packages/django/template/base.py", line 903, in render_annotated
return self.render(context)
File "/Users/jannicklangkjaer/PycharmProjects/penge/venv/lib/python3.8/site-packages/widget_tweaks/templatetags/widget_tweaks.py", line 220, in render
bounded_field.field.widget.input_type = v.resolve(context)
AttributeError: 'str' object has no attribute 'field'

这个错误是什么意思？我们该如何解决？

感谢您抽出时间

Answer 1

我在您的forms.py代码中发现了两个错误。

1. 您使用的是Form而不是ModelForm
2. 您正在使用string设置字段，但需要使用tuple或list进行设置

请使用以下代码更新您的forms.py代码

from django import forms
from .models import BusinessContact

class BusinessContactForm(forms.ModelForm):
class Meta:
model = BusinessContact
fields = ('co_nip_number',)

我已经测试了上面的代码，它解决了问题并成功地渲染了字段。