Объект 'str' не имеет атрибута 'field' с использованием widget_tweaks

Question

Этот вопрос поднимался множество раз, но все они сузились до их конкретной c проблемы. Я надеюсь, что этот вопрос может прояснить проблему больше, поэтому он станет более полезным, чем просто сузится до моей проблемы.

Я получаю сообщение об ошибке 'str' object has no attribute 'field'

И я получил следующий код

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'

Что означает эта ошибка? Как мы ее решаем?

Спасибо за ваше время

Answer 1

Я обнаружил две ошибки в вашем коде forms.py.

1. Вы используете Form вместо ModelForm
2. Вы устанавливаете поля с string, но это необходимо установить с помощью tuple или list

Пожалуйста, обновите свой код forms.py следующим кодом

from django import forms
from .models import BusinessContact


class BusinessContactForm(forms.ModelForm):

    class Meta:
        model = BusinessContact
        fields = ('co_nip_number',)

Я протестировал указанный выше код, он решил проблема и успешно отображает поле.