Question

你好，这是我在这里的第一篇文章。我是python和django的新手，我想进一步了解两者，因此我正在与他们合作以获取更多经验。

我正在尝试让metros的所有user(x)都说1。我希望能够将user 1作为id，并获取与此metros相关的所有user。

模型

from django.db import models
from django.utils import timezone
from django.contrib.auth.models import User
# Create your models here.
class Metro(models.Model):
class Meta():
    verbose_name_plural = "MetroCards"

    owner = models.ForeignKey(User, on_delete=models.CASCADE, related_name="Creator")
    metro_name = models.CharField( max_length=30)
    created = models.DateTimeField(default=timezone.now)

    def __str__(self):
        return f"{self.metro_name} by: {self.owner}"

观看次数

from django.shortcuts import render, redirect, Http404
from .models import User, Metro
from django.contrib.auth import login, authenticate
from django.contrib.auth.forms import UserCreationForm
def user(request, user_id):
    try:
        user = User.objects.get(pk=user_id)
        metro = Metro.owner.get(pk=user_id)
    except User.DoesNotExist:
        raise Http404("User Does Not Exist")
    context = {
        "user": user,
        "metro": metro
    }
    return render(request, "metrocard/user.html", context)

网址

from django.urls import path
from . import views

urlpatterns = [
    path('', views.index, name='index'),
    path('register/', views.register, name='register'),
    path("user/<str:user_id>", views.user, name="userid"),
    path('map/', views.map, name='map'),
]

HTML

<h1>User Id: {{ user.id}} </h1>
<ul>
    <li>Username: {{ user.username }} </li>
    <li>Email: {{ user.email }} </li>
    {% for met in metro %}
        <li>Metro Name: {{ met.metro_name }}</li>
    {% endfor %}

</ul>

我遇到的错误是：

'ForwardManyToOneDescriptor' object has no attribute 'get'

使用控制台回溯进行编辑：

Traceback (most recent call last):
File "/home/bryant/Desktop/metro/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
response = get_response(request)
File "/home/bryant/Desktop/metro/lib/python3.6/site-packages/django/core/handlers/base.py", line 126, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/home/bryant/Desktop/metro/lib/python3.6/site-packages/django/core/handlers/base.py", line 124, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/bryant/Desktop/metro/vMetro/metrocard/views.py", line 16, in user
metro = Metro.owner.get(pk=user_id)
AttributeError: 'ForwardManyToOneDescriptor' object has no attribute 'get'

Answer 1

我认为您应该更改：

    metro = Metro.owner.get(pk=user_id)

到

    metro = user.metro_set.all()

Answer 2

models.py

class Product(models.Model): 
    title = models.CharField(max_length=120)
    description = models.TextField(blank=True)
    price = models.TextField()

views.py

def dynamic_lookup_view(request,my_id):
    object = Product.objects.get(id=my_id)
    context = {
        'product':object
    }
    return render(request,'products/product_detail.html',context)

urls.py

path('products/<int:my_id>/',dynamic_lookup_view)

HTML

{{ product.title }}
{{ product.description }}

Django 2.1.7-从用户（x）检索所有Model字段

2 个答案: