我有一个DRF的API，它应该是为一个Android和IOS的前端应用提供服务。该API有三种类型的用户，即：驱动程序，客户端和管理员。司机，客户端和管理员。
客户端应该创建一个预订记录，并由API自动分配一个司机。基于可用天数和时间。目前每天（周日、周一、周二、周三、周四、周五）都是工作日，工作时间从早上7:00到晚上9:00，工作时间包括过渡期是一个小时。例如，上午9:00的预约需要一个小时，因此结束时间为10:00，所有因素都包括在内。许多司机可以在同一时间有工作。如果用户尝试预订已经选好的时段，应用应该给用户反馈。
目前我的问题是要从司机表中循环浏览已经存在的司机，将他们左键加入到预订表中，然后逐一分配他们。我能够给一个司机分配一个工作。但是当我添加司机时，就变得很困难。有一些东西我没有弄好，我不知道是什么。
这是我的模型。
""" models.py """
""" Helper function to check overlapping times """
def check_time_overlap(self, fixed_start, fixed_end, new_start, new_end):
time_overlap = False
if new_start == fixed_end or new_end == fixed_start: # edge case
time_overlap = False
elif (new_start >= fixed_start and new_start <= fixed_end) or \
(new_end >= fixed_start and new_end <= fixed_end): \
# innner limits
time_overlap = True
elif new_start <= fixed_start and new_end >= fixed_end: \
# outter limits
time_overlap = True
return time_overlap
""" Function to check overlapping bookings """
def overlapping_bookings(self):
if self.finishing_at <= self.booking_time:
raise ValidationError(
'Finishing times must be after booking times'
)
bookings = Booking.objects.filter(
booking_date=self.booking_date, driver_id=self.driver
)
if bookings.exists():
for booking in bookings:
""" Check whether date and time overlaps """
if self.check_time_overlap(
booking.booking_time, booking.finishing_at,
self.booking_time, self.finishing_at
):
""" If all drivers are allocated, raise an error \
message. """
raise ValidationError(
'All our drivers are booked at: ' +
str(booking.booking_date) + ', ' + str(
booking.booking_time) + '-' +
str(booking.finishing_at))
def save(self, *args, **kwargs):
self.calc_booking_total()
self.calc_finishing_at()
self.overlapping_bookings()
super(Booking, self).save(*args, **kwargs)
从上面的模型中，我写了一个函数来检查同一预订日期、预订时间和结束时间的重叠时间。这个灵感来自于 ALEXANDRE PINTO on >.Github.IO20170715django-calendarhttps:/alexpnt.github.io20170715django-calendar。
以下是序列号
# BOOKING SERIALIZER
# ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––#
class BookingSerializer(serializers.ModelSerializer):
package = serializers.SerializerMethodField()
vehicle_type = serializers.SerializerMethodField()
client_name = serializers.SerializerMethodField()
client_phone = serializers.SerializerMethodField()
class Meta:
model = Booking
# fields = '__all__'
exclude = ('driver',)
read_only_fields = (
'booking_total', 'booking_status',
'booked_at', 'finishing_at', 'client'
)
def get_package(self, obj):
return obj.service.package_name
def get_vehicle_type(self, obj):
return obj.service.vehicle_category.name
def get_client_name(self, obj):
return obj.client.name
def get_client_phone(self, obj):
return str(obj.client.phone)
""" Function to create booking based on authenticated client and available drivers """
def create(self, validated_data):
validated_data['client'] = self.context['request'].user
validated_data['driver'] = Driver.objects.get(active=True)
bookings = Booking.objects.create(**validated_data)
return bookings
这是我的服务器日志。
下面是我针对以下问题创造的一个解决方案。谁都可以完善它。注意：它的帮助来自于函数 overlapping_bookings() 以便在所有司机分配完毕后，停止对单一日期和时间的预订。这将会从 overlapping_bookings() 关于 save()
希望对大家有所帮助
在 serializers.py，该函数覆盖了 ModelViewSet create.
def create(self, validated_data):
""" Function to create booking objects \
and allocate drivers automatically. """
validated_data['client'] = self.context['request'].user
""" Variable to save all drivers (querysets) from the driver \
table ordered by the booking date and time. --> maybe there is \
a better way to do it. Avoid using .get()"""
drivers = Driver.objects.filter(active=True).order_by(
'-booking__booking_date', '-booking__booking_time').all()
""" Check whether the drivers querysets (list) exists """
if drivers.exists():
""" For loop to isolate a single query set from list of \
quersets (drivers) """
for drv in drivers:
""" Condition to check for inner join query between \
driver and booking table carefully filtering them using \
booking_date and booking_time. This code is helped by \
the clean() function in models. Which after every active=True \
driver is allocated a booking, raises a ValidationError. \
It is subject to be made better. Trying to find out how it \
will throw a HttpResponse error instead."""
if Booking.objects.select_related('driver').filter(
booking_date=validated_data['booking_date'],
booking_time=validated_data['booking_time'],
).annotate(drv=F('driver__user_ptr')).exists():
continue
try:
return Booking.objects.create(driver=drv, **validated_data)
except Booking.DoesNotExist:
pass