当我尝试在Django中使用DeleteView时，无法调用“ str”对象 [英] 'str' object is not callable when i try to use DeleteView in Django
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问题描述
这是我的文件
urls.py 为删除过程创建的URL路径
urls.py the URL paths I created for the delete process
path('dress/<int:pk>/delete', views.DressDelete.as_view(), name="dress_delete"),
path('dress/delete/confirm', views.dress_delete_confirm, name="dress_delete_confirm"),
views.py ，我在其中创建了要删除的视图，并在删除完成后通知用户
views.py where i created the view for delete and view that is going to appear after deleting is completed to inform the user
from django.urls import reverse_lazy
from django.views.generic import DeleteView
class DressDelete (DeleteView):
model = Item
success_url = reverse_lazy('dress_delete_confirm')
@login_required
def dress_delete_confirm(request):
return render(request, 'fostania_web_app/dress_delete_confirm.html')
models.py 我要删除的表在哪里te from：
the models.py where is the table I'm trying to delete from :
class Item(models.Model):
# custom validators
alphanumeric = RegexValidator(r'^[0-9a-zA-Z]*$', 'Only alphanumeric characters are allowed.')
# fields
dress_name = models.ForeignKey(Name, on_delete='DO_NOTHING', blank=False, verbose_name='نوع الفستان',)
dress_rate = models.ForeignKey(Rate, on_delete='DO_NOTHING', blank=False, verbose_name='تصنيف الفستان',)
dress_size = models.ForeignKey(Size, on_delete='DO_NOTHING', verbose_name='مقاس الفستان', blank=False)
dress_color = models.CharField(max_length=50, verbose_name='لون الفستان', blank=False)
dress_image1 = models.ImageField(upload_to='documents/%Y/%m/%d', null=False, verbose_name='الصورة الأساسية للفستان',
help_text='لا يمكنك تركها فارغة',blank=False)
dress_image2 = models.ImageField(upload_to='documents/%Y/%m/%d', null=True, verbose_name='صورة إضافية ', blank=False)
dress_image3 = models.ImageField(upload_to='documents/%Y/%m/%d', null=True, verbose_name='صورة إضافة ', blank=False)
dress_action = models.ForeignKey(Action, on_delete='DO_NOTHING', verbose_name='الفستان معروض لل ',
help_text='للبيع او للإيجار ', blank=False)
dress_price = models.IntegerField(default=1, verbose_name='السعر', blank=False)
dress_mobile = models.CharField(max_length=20, validators=[alphanumeric], verbose_name='رقم الهاتف ', blank=False)
created_by = models.CharField(max_length=250,)
created_username = models.CharField(max_length=250, default='unknown')
created_at = models.DateTimeField(auto_now=True)
dress_active = models.BooleanField(default=False)
dress_special = models.BooleanField(default=False)
dress_town = models.ForeignKey(Town, on_delete='DO_NOTHING', verbose_name='المحافظة', blank=False)
这是b其他 HTML 文件正在使用：
and here is the both HTML files am using :
item_confirm_delete.html
{% extends 'fostania_web_app/base.html' %}
{% block content %}
{% load static %}
<Br><br><br><br>
{% if request.user.email == object.created_username %}
<div class ="well well-small" align="center">
<!-- adsense -->
<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<!-- fostania-item_confirm_delete-page -->
<ins class="adsbygoogle"
style="display:block"
data-ad-client="ca-pub-4202417439740489"
data-ad-slot="5176371539"
data-ad-format="auto"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>
<!-- end adsense -->
<form method="post">
{% csrf_token %}
<b>
<p>هل انت متأكد من رغبتك فى مسح الفستان </p>
</b>
<br>
<img src="{{ object.dress_image1.url }}" style="width: 250px;height: 250px;">
<Br>
<br>
<input class = "btn btn-danger" type="submit" value="تأكيد المسح" />
<br><br>
</form>
<a href="{% url 'home' %}"><button class="btn btn-success">رجوع للموقع</button></a>
</div>
{% else %}
<div class ="well well-small" align="center">
<b><font color="red">عفواً..لا يمكنك مسح فساتين مستخدمين غيرك</font></b><br><br>
<a href="{% url 'home' %}"><button class="btn-success">الرجوع للموقع</button></a>
</div>
{% endif %}
<!-- Placed at the end of the document so the pages load faster -->
{% endblock %}
dress_delete_confirm.html HTML删除后显示的页面
dress_delete_confirm.html the HTML page that appears after deleting
{% extends 'fostania_web_app/base.html' %}
{% block content %}
{% load static %}
<br><br><Br><br>
<div align="center">
<!-- adsnse -->
<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<!-- fostania-dress_delete_confirm-page -->
<ins class="adsbygoogle"
style="display:block"
data-ad-client="ca-pub-4202417439740489"
data-ad-slot="3991406089"
data-ad-format="auto"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>
<!-- end adsense -->
<div class="card border-dark mb-3" style="max-width: 18rem;">
<div class="card-header">تم مسح الفستان</div>
<div class="card-body text-dark">
<p class="card-text">
<B>لقد تم مسح الفستان بنجاح</B>
<br>
<a href="{% url 'home' %}"><button class="btn btn-success">موافــق</button></a>
</p>
</div>
</div>
</div>
{% endblock %}
这是错误和 traceback
'str'对象不可调用
Environment:
Request Method: POST
Request URL: https://fostania.herokuapp.com/dress/4/delete
Django Version: 2.0.5
Python Version: 3.6.4
Installed Applications:
['django_filters',
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'fostania_web_app.apps.FostaniaWebAppConfig']
Installed Middleware:
('whitenoise.middleware.WhiteNoiseMiddleware',
'whitenoise.middleware.WhiteNoiseMiddleware',
'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')
Traceback:
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
35. response = get_response(request)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
128. response = self.process_exception_by_middleware(e, request)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
126. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/app/.heroku/python/lib/python3.6/site-packages/django/views/generic/base.py" in view
69. return self.dispatch(request, *args, **kwargs)
File "/app/.heroku/python/lib/python3.6/site-packages/django/views/generic/base.py" in dispatch
89. return handler(request, *args, **kwargs)
File "/app/.heroku/python/lib/python3.6/site-packages/django/views/generic/edit.py" in post
218. return self.delete(request, *args, **kwargs)
File "/app/.heroku/python/lib/python3.6/site-packages/django/views/generic/edit.py" in delete
213. self.object.delete()
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/base.py" in delete
890. collector.collect([self], keep_parents=keep_parents)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/deletion.py" in collect
222. field.remote_field.on_delete(self, field, sub_objs, self.using)
Exception Type: TypeError at /dress/4/delete
Exception Value: 'str' object is not callable
推荐答案
on_delete 参数应具有特定的值，而不是简单的字符串。您需要将外键更改为以下内容：
on_delete argument should has specific value, not simple strings. You need to change your foreign keys to the following:
dress_town = models.ForeignKey(Town, on_delete=models.DO_NOTHING, verbose_name='المحافظة', blank=False)
您需要使用模型。 DO_NOTHING 而不是 DO_NOTHING 字符串。
You need to use models.DO_NOTHING instead of DO_NOTHING string.
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