im试图创建一个django页面来更新数据库中的dta，我以前在其他项目中也这样做过，但在我的项目中它返回了这个错误：django.urls.exceptions.NoReverseMatch:找不到参数为"(''，("的'update'的反向。尝试了1个模式：['update/(？P[0-9]+($']
我检查了我的代码一千次，即使与其他项目相比，我也看不出任何错误。
Obs.：请忽略我模板中的css部分，我不习惯在html中编写css，但由于这只是一个测试，我不创建外部文件。
urls.py:
from django.urls import path
import tables1.views as vw
urlpatterns = [
path('admin/', admin.site.urls, name = 'admin'),
path('mytables/', vw.mytables, name = 'mytables'),
path('',vw.home),
path('table/<int:pk>',vw.table, name = 'tableurl'),
path('newtable/',vw.newtable,name = 'newtable'),
path('update/<int:pk>',vw.update,name = 'update'),
path('delete/<int:pk>',vw.delete,name = 'delete'),
path('new/',vw.new, name = 'newurl')
]
models.py:
class Table(models.Model):
idd = models.AutoField(primary_key=True, default=None)
name = models.CharField(max_length=100)
date = models.DateField(auto_now_add=True)
time = models.TimeField(auto_now_add=True)
class Meta:
verbose_name_plural = 'Tables'
def __str__(self):
return self.name
class Transacao(models.Model):
# Forein key defined here
date = models.DateTimeField(auto_now_add=True)
desc = models.CharField(max_length=200)
value = models.DecimalField(max_digits=7, decimal_places=2)
obs = models.TextField(null=True, blank=True)
tableid = models.CharField(max_length=3)
class Meta:
verbose_name_plural = 'Transacoes'
def __str__(self):
return self.desc
views.py:
from .models import Table
from .models import Transacao
from .forms import TableForm
from .forms import TransacaoForm
def home(request):
now = {}
return render(request,'tables1/home.html',now)
def mytables(request):
data = {}
data['tables'] = Table.objects.all()
return render(request, 'tables1/mytables.html', data)
def update(request,pk):
transacao = Transacao.objects.get(pk = pk)
form = TransacaoForm(request.POST or None, instance=transacao)
if form.is_valid():
form.save()
return render(request,'tables1/new.html',{'form':form})
def new(request):
form = TransacaoForm(request.POST or None)
if form.is_valid():
form.save()
return render(request,'contas/form.html',{'form':form})
def delete(request,pk):
transacao = Transacao.objects.get(pk = pk)
transacao.delete()
return redirect('lists')
def table(request,pk):
form = TransacaoForm(request.POST or None)
data = Table.objects.get(idd = pk)
lists = Transacao.objects.filter(tableid = pk)
if request.method == 'POST':
if form.is_valid():
formdesc = form.cleaned_data['desc']
formvalue = form.cleaned_data['value']
transaction_instance = Transacao.objects.create(desc = formdesc,value = formvalue,tableid = pk)
return render(request,'tables1/table.html',{'data':data, 'form':form, 'lists':lists})
def newtable(request):
form = TableForm(request.POST or None)
if form.is_valid():
form.save()
return redirect('mytables')
return render(request,'tables1/newtable.html',{'form':form})
table.html：
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {font-family: Arial, Helvetica, sans-serif;}
* {box-sizing: border-box;}
/* Button used to open the contact form - fixed at the bottom of the page */
.open-button {
background-color: #555;
color: white;
padding: 16px 20px;
border: none;
cursor: pointer;
opacity: 0.8;
}
/* The popup form - hidden by default */
.form-popup {
display: none;
bottom: 0;
right-margin: 10px;
right: 15px;
border: 3px solid #f1f1f1;
z-index: 9;
}
/* Add styles to the form container */
.form-container {
max-width: 300px;
padding: 10px;
background-color: white;
}
/* Full-width input fields */
.form-container input[type=text], .form-container input[type=password] {
width: 100%;
padding: 15px;
margin: 5px 0 22px 0;
border: none;
background: #f1f1f1;
}
/* When the inputs get focus, do something */
.form-container input[type=text]:focus, .form-container input[type=password]:focus {
background-color: #ddd;
outline: none;
}
/* Set a style for the submit/login button */
.form-container .btn {
background-color: #4CAF50;
color: white;
padding: 16px 20px;
border: none;
cursor: pointer;
width: 100%;
margin-bottom:10px;
opacity: 0.8;
}
/* Add some hover effects to buttons */
.form-container .btn:hover, .open-button:hover {
opacity: 1;
}
</style>
</head>
<body>
<h1>{{data}}</h1>
<table id = tabela>
<tr>
<th>Item</th>
<th>Data e Hora</th>
<th>Valor</th>
</tr>
{% for list in lists %}
<tr>
<td>{{list.desc}}</td><td>{{list.date}}</td>
<td>{{list.value}}</td><td>{{list.categ}}</td>
<td><form action="{% url 'update' transacao.id %}">
<button type="submit"><b>Editar</b></button>
</form></td>
<td><form action="{% url 'delete' transacao.id %}">
<button type="submit"><b>Excluir</b></button>
</form></td>
</tr>
{%endfor%}
</table>
<button class="open-button" onclick="{% url newurl %}">Nova Transação</button>
<form method="post" class="form-container">
{% csrf_token %}
{{form.as_p}}
<button type="submit" class="btn" onclick="location.reload()">Login</button>
<button type="button" class="btn cancel" onclick="closeForm()">Close</button>
</form>
</body>
</html>
transacao不是模板中的变量，您使用list作为Transacao对象的变量，因此您应该使用{% url 'update' list.id %}和{% url 'delete' list.id %}:
{% for list in lists %}
<tr>
<td>{{ list.desc }}</td><td>{{ list.date }}</td>
<td>{{ list.value }}</td><td>{{ list.categ }}</td>
<td><form action="{% url 'update'list.id%}">
<button type="submit"><b>Editar</b></button>
</form></td>
<td><form action="{% url 'delete'list.id%}">
<button type="submit"><b>Excluir</b></button>
</form></td>
</tr>
{%endfor%}也就是说，由于您的lists不是列表的集合，它是Transacao的QuerySet，因此最好将lists重命名为transacaos，并将transacao用作"；枚举器"；。