我正在尝试在测试Flask应用程序中使用蓝图，但遇到了一个奇怪的问题。这是我的代码的相关部分：
from functools import wraps
from flask import flash, redirect, render_template, \
request, session, url_for, Blueprint
from sqlalchemy.exc import IntegrityError
from datetime import datetime
from time import localtime, strftime
from .forms import AddAppointmentForm
from project import db
from project.models import Appointment
appointments_blueprint = Blueprint('appointments', __name__)
def login_required(test):
@wraps(test)
def wrap(*args, **kwargs):
if 'logged_in' in session:
return test(*args, **kwargs)
else:
flash('You need to login first.')
return redirect(url_for('users.login'))
return wrap
@appointments_blueprint.route('/appointments/')
@login_required
def appointments():
# Get current date
current_datetime = strftime("%Y-%m-%d %H:%M:%S", localtime())
future_appointments = db.session.query(Appointment)\
.filter(Appointment.due_date >= current_datetime)\
.order_by(Appointment.due_date.asc())
past_appointments = db.session.query(Appointment)\
.filter(Appointment.due_date < current_datetime)\
.order_by(Appointment.due_date.asc())
return render_template('appointments.html',
form = AddAppointmentForm(request.form),
future_appointments=future_appointments,
past_appointments=past_appointments)
现在，当我运行该应用程序时，出现以下错误：
File "/home/mosquito/git/flask-scheduler/project/appointments/views.py", line 72, in <module>
@login_required
File "/home/mosquito/python_envs/flask-scheduler/local/lib/python2.7/site-packages/flask/blueprints.py", line 160, in decorator
endpoint = options.pop("endpoint", f.__name__)
AttributeError: 'NoneType' object has no attribute '__name__'
查看blueprints.py，我看到以下内容：
def route(self, rule, **options):
"""Like :meth:`Flask.route` but for a blueprint. The endpoint for the
:func:`url_for` function is prefixed with the name of the blueprint.
"""
def decorator(f):
endpoint = options.pop("endpoint", f.__name__)
self.add_url_rule(rule, endpoint, f, **options)
return f
return decorator
这失败，因为'f'为None。现在更有趣的是，如果我删除
@login_required
装饰器，当它到达那个点时，f是一个函数，所以没关系。
另一方面，如果我删除
@appointments_blueprint.route()
装饰器，它也可以工作。因此，看起来这两个装饰器的组合导致f为None ....任何想法，这是怎么回事？
您需要取消缩进return：
def login_required(test):
@wraps(test)
def wrap(*args, **kwargs):
if 'logged_in' in session:
return test(*args, **kwargs)
else:
flash('You need to login first.')
return redirect(url_for('users.login'))
return wrap
您使其成为wrap函数本身的一部分，因此外部装饰器函数未返回任何内容。
删除@appointments_blueprint.route()简单路线不会注册路线，因此您永远不会发现自己设置appointments为None。
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