我是Python和Django的新手。我正在从教程中学习它，但是介于两者之间。已经尝试过其他一些StackOverflow解决方案，但是没有运气。我收到以下错误
错误：/ catalog /中的NoReverseMatch 有人，请帮助我解决我犯的错误。
url.py
urlpatterns += [
path('book/<uuid:pk>/renew/', views.renew_book_librarian, name='renew-book-librarian'),
]
view.py
@permission_required('catalog.view_all_books')
def renew_book_librarian(request, pk):
"""View function for renewing a specific BookInstance by librarian."""
book_instance = get_object_or_404(BookInstance, pk=pk)
# If this is a POST request then process the Form data
if request.method == 'POST':
# Create a form instance and populate it with data from the request (binding):
book_renewal_form = RenewBookForm(request.POST)
# Check if the form is valid:
if book_renewal_form.is_valid():
# process the data in form.cleaned_data as required (here we just write it to the model due_back field)
book_instance.due_back = book_renewal_form.cleaned_data['renewal_date']
book_instance.save()
# redirect to a new URL:
return HttpResponseRedirect(reverse('all-borrowed'))
# If this is a GET (or any other method) create the default form.
else:
proposed_renewal_date = datetime.date.today() + datetime.timedelta(weeks=3)
book_renewal_form = RenewBookForm(initial={'renewal_date': proposed_renewal_date})
context = {
'form': book_renewal_form,
'book_instance': book_instance,
}
return render(request, 'catalog/book_renew_librarian.html', context)
model.py
class BookInstance(models.Model):
"""
Model representing a specific copy of a book (i.e. that can be borrowed from the library).
"""
id = models.UUIDField(primary_key=True, default=uuid.uuid4,
help_text="Unique ID for this particular book across whole library")
book = models.ForeignKey('Book', on_delete=models.SET_NULL, null=True)
imprint = models.CharField(max_length=200)
due_back = models.DateField(null=True, blank=True)
borrower = models.ForeignKey(User, on_delete=models.SET_NULL, null=True, blank=True)
@property
def is_overdue(self):
if self.due_back and date.today() > self.due_back:
return True
return False
LOAN_STATUS = (
('d', 'Maintenance'),
('o', 'On loan'),
('a', 'Available'),
('r', 'Reserved'),
)
status = models.CharField(max_length=1, choices=LOAN_STATUS, blank=True, default='d', help_text='Book availability')
class Meta:
ordering = ["due_back"]
permissions = (("view_all_books", "View all books"),)
def __str__(self):
"""
String for representing the Model object.
"""
# return '%s (%s)' % (self.id,self.book.title)
# return '{0} ({1})'.format(self.id, self.book.title)
return self.book.title
forms.py
class RenewBookForm(forms.Form):
renewal_date = forms.DateField(help_text="Enter a date between now and 4 weeks (default 3).")
def clean_renewal_date(self):
data = self.cleaned_data['renewal_date']
# Check if a date is not in the past.
if data < datetime.date.today():
raise ValidationError(_('Invalid date - renewal in past'))
# Check if a date is in the allowed range (+4 weeks from today).
if data > datetime.date.today() + datetime.timedelta(weeks=4):
raise ValidationError(_('Invalid date - renewal more than 4 weeks ahead'))
# Remember to always return the cleaned data.
return data
book_renew_librarian.html
{% extends "base_generic.html" %}
{% block content %}
<h1>Renew: {{ book_instance.book.title }}</h1>
<p>Borrower: {{ book_instance.borrower }}</p>
<p>Book ID: {{ book_instance.id }}</p>
<p {% if book_instance.is_overdue %} class="text-danger"{% endif %}>Due date: {{ book_instance.due_back }}</p>
<form action="" method="post">
{% csrf_token %}
{{ form.as_table }}
<input type="submit" value="Submit">
</form>
{% endblock %}
base_generic.html
{% if perms.catalog.view_all_books %}- <a href="{% url 'renew-book-librarian' book_instance.id %}">Renew</a> {% endif %}