AttributeError at /cart/ 'NoneType' object has no attribute '_base_manager'
Пишу интернет магазин на Django, возникают проблемы с корзиной. Вылетает вот такая вот ошибка.
Html файл:
{% load static %}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="description" content="">
<meta name="author" content="">
<title>H-made Dolls</title>
<!-- Bootstrap core CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" crossorigin="anonymous">
<!-- Custom styles for this template -->
</head>
<style>
body {
padding-top: 56px;
}
</style>
<body>
<!-- Navigation -->
<nav class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top">
<div class="container">
<a class="navbar-brand" href="{% url 'base' %}">H-made Dolls</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label>
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarResponsive">
<ul class="navbar-nav ml-auto">
<li class="nav-item">
<a class="nav-link" href="{% url 'cart' %}">Корзина <span class="badge badge-danger">{{ cart.products.count }}</span></a>
</li>
</ul>
</div>
</div>
</nav>
<!-- Page Content -->
<div class="container">
<div class="row">
<div class="col-lg-3 mt-5">
<div class="list-group">
{% for category in categories %}
<a href="{{ category.url }}" class="list-group-item">{{ category.name }} ({{ category.count }})</a>
{% endfor %}
</div>
</div>
<!-- /.col-lg-3 -->
<div class="col-lg-9">
{% block content %}
{% if messages %}
{% for message in messages %}
<div class="alert alert-success alert-dismissible fade show mt-3" role="alert">
<strong>{{ message }}</strong>
<button type="button" class="close" data-dismiss="alert" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
{% endfor %}
{% endif %}
<div id="carouselExampleIndicators" class="carousel slide my-4" data-ride="carousel">
</div>
<div class="row">
{% for product in products %}
<div class="col-lg-4 col-md-6 mb-4">
<div class="card h-100">
<a href="{{ product.get_absolute_url }}"><img class="card-img-top" src="{{ product.image.url }}" alt=""></a>
<div class="card-body">
<h4 class="card-title">
<a href="{{ product.get_absolute_url }}">{{ product.title }}</a>
</h4>
<h6>{{ product.description }}</h6>
<h5>{{ product.price }} руб.</h5>
<a href="{% url 'add_to_cart' ct_model=product.get_model_name slug=product.slug %}">
<button class="btn btn-danger">Добавить в корзину</button>
</a>
</div>
</div>
</div>
{% endfor %}
</div>
<!-- /.row -->
{% endblock content %}
</div>
<!-- /.col-lg-9 -->
</div>
<!-- /.row -->
</div>
<!-- /.container -->
<!-- Bootstrap core JavaScript -->
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" crossorigin="anonymous"></script>
</body>
</html>
urls.py:
from django.urls import path
from .views import (
BaseView,
ProductDetailView,
CategoryDetailView,
CartView,
AddToCartView,
DeleteFromCartView,
ChangeQTYView,
CheckoutView,
MakeOrderView
)
urlpatterns = [
path('', BaseView.as_view(), name='base'),
path('products/<str:ct_model>/<str:slug>/', ProductDetailView.as_view(), name='product_detail'),
path('category/<str:slug>/', CategoryDetailView.as_view(), name='category_detail'),
path('cart/', CartView.as_view(), name='cart'),
path('add-to-cart/<str:ct_model>/<str:slug>/', AddToCartView.as_view(), name='add_to_cart'),
path('remove-from-cart/<str:ct_model>/<str:slug>/', DeleteFromCartView.as_view(), name='delete_from_cart'),
path('change-qty/<str:ct_model>/<str:slug>/', ChangeQTYView.as_view(), name='change_qty'),
path('checkout/', CheckoutView.as_view(), name='checkout'),
path('make-order/', MakeOrderView.as_view(), name='make_order')
]
cart.html:
{% extends 'base.html' %}
{% block content %}
<h3 class="text-center mt-5 mb-5">Ваша корзина {% if not cart.products.count %}пуста{% endif %}</h3>
{% if messages %}
{% for message in messages %}
<div class="alert alert-success alert-dismissible fade show" role="alert">
<strong>{{ message }}</strong>
<button type="button" class="close" data-dismiss="alert" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
{% endfor %}
{% endif %}
{% if cart.products.count %}
<table class="table">
<thead>
<tr>
<th scope="col">Наименование</th>
<th scope="col">Изображение</th>
<th scope="col">Цена</th>
<th scope="col">Кол-во</th>
<th scope="col">Общая цена</th>
<th scope="col">Действие</th>
</tr>
</thead>
<tbody>
{% for item in cart.products.all %}
<tr>
<th scope="row">{{ item.content_object.title }}</th>
<td class="w-25"><img src="{{ item.content_object.image.url }}" class="img-fluid"></td>
<td>{{ item.content_object.price }} руб.</td>
<td>
<form action="{% url 'change_qty' ct_model=item.content_object.get_model_name slug=item.content_object.slug %}" method="POST">
{% csrf_token %}
<input type="number" class="form-control" name="qty" style="width: 70px;" min="1" value="{{ item.qty }}">
<br>
<input type="submit" class="btn btn-primary" value="Изменить кол-во">
</form>
</td>
<td>{{ item.final_price }} руб.</td>
<td>
<a href="{% url 'delete_from_cart' ct_model=item.content_object.get_model_name slug=item.content_object.slug %}"><button class="btn btn-danger">Удалить из корзины</button></a>
</td>
</tr>
{% endfor %}
<tr>
<td colspan="2"></td>
<td>Итого:</td>
<td>{{ cart.total_products }}</td>
<td><strong>{{ cart.final_price }} руб.</strong></td>
<td><a href="{% url 'checkout' %}"><button class="btn btn-primary">Перейти к оформлению</button></a></td>
</tr>
</tbody>
</table>
{% endif %}
{% endblock content %}
Traceback
Environment:
Request Method: GET
Request URL: http://localhost:8000/cart/
Django Version: 2.2.16
Python Version: 3.9.6
Installed Applications:
['django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'mainapp',
'crispy_forms']
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 C:\Users\Fake\Desktop\django3-ecommerce-master\mainapp\templates\base.html, error at line 31
'NoneType' object has no attribute '_base_manager'
21 : body {
22 : padding-top: 56px;
23 : }
24 : </style>
25 : <body>
26 :
27 : <!-- Navigation -->
28 : <nav class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top">
29 : <div class="container">
30 : <a class="navbar-brand" href="{% url 'base' %}">H-made Dolls</a>
31 : <button class="navbar-toggler" type="button" data-toggle="collapse" data-target ="#navbarResponsive" aria-contr ols="navbarResponsive" aria-expanded="false" aria-label>
32 : <span class="navbar-toggler-icon"></span>
33 : </button>
34 : <div class="collapse navbar-collapse" id="navbarResponsive">
35 : <ul class="navbar-nav ml-auto">
36 : <li class="nav-item">
37 : <a class="nav-link" href="{% url 'cart' %}">Корзина <span class="badge badge-danger">{{ cart.products.count }}</span></a>
38 : </li>
39 : </ul>
40 : </div>
41 : </div>
Traceback:
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py" in _resolve_lookup
829. current = current[bit]
During handling of the above exception ('CartProduct' object is not subscriptable), another exception occurred:
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\core\handlers\exception.py" in inner
34. response = get_response(request)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\core\handlers\base.py" in _get_response
115. response = self.process_exception_by_middleware(e, request)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\core\handlers\base.py" in _get_response
113. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\views\generic\base.py" in view
71. return self.dispatch(request, *args, **kwargs)
File "C:\Users\Fake\Desktop\django3-ecommerce-master\mainapp\mixins.py" in dispatch
42. return super().dispatch(request, *args, **kwargs)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\views\generic\base.py" in dispatch
97. return handler(request, *args, **kwargs)
File "C:\Users\Fake\Desktop\django3-ecommerce-master\mainapp\views.py" in get
122. return render(request, 'cart.html', context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\shortcuts.py" in render
36. content = loader.render_to_string(template_name, context, request, using=using)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\loader.py" in render_to_string
62. return template.render(context, request)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\backends\django.py" in render
61. return self.template.render(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py" in render
171. return self._render(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py" in _render
163. return self.nodelist.render(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py" in render
937. bit = node.render_annotated(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py" in render_annotated
904. return self.render(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\loader_tags.py" in render
150. return compiled_parent._render(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py" in _render
163. return self.nodelist.render(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py" in render
937. bit = node.render_annotated(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py" in render_annotated
904. return self.render(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\loader_tags.py" in render
62. result = block.nodelist.render(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py" in render
937. bit = node.render_annotated(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py" in render_annotated
904. return self.render(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\defaulttags.py" in render
309. return nodelist.render(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py" in render
937. bit = node.render_annotated(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py" in render_annotated
904. return self.render(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\defaulttags.py" in render
209. nodelist.append(node.render_annotated(context))
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py" in render_annotated
904. return self.render(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py" in render
987. output = self.filter_expression.resolve(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py" in resolve
671. obj = self.var.resolve(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py" in resolve
796. value = self._resolve_lookup(context)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\template\base.py" in _resolve_lookup
837. current = getattr(current, bit)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\contrib\contenttypes\fields.py" in __get__
240. rel_obj = ct.get_object_for_this_type(pk=pk_val)
File "C:\Users\Fake\AppData\Local\Programs\Python\Python39\lib\site-packages\django\contrib\contenttypes\models.py" in get_object_for_this_type
168. return self.model_class()._base_manager.using(self._state.db).get(**kwargs)
Exception Type: AttributeError at /cart/
Exception Value: 'NoneType' object has no attribute '_base_manager'
PS. Пробовал убирать строчку, не помогает.