[英]Django Models internal methods
我是Django的新手,所以我只是組成了一個項目來了解它,但是此代碼有一個小問題,我希望能夠將它作為car obj(如果有),所以我可以這樣做:
>>>cars = Car.objects.all()
>>>print cars[0].category
>>>'A'
>>>cars[0].available(fr, to)
結果是:
>>>global name 'category' is not defined
因此,看來我無法在課堂上使用self.category,有什么想法嗎?
from django.db import models
class Car(models.Model):
TRANSMISSION_CHOICES = (
('M', 'Manual'),
('A', 'Automatic'),
)
category = models.CharField("Category",max_length=1,primary_key=True)
description = models.CharField("Description",max_length=200)
numberOfCars = models.IntegerField("Number of cars")
numberOfDoors = models.IntegerField("Number of doors")
transmission = models.CharField("Transmission", max_length=1, choices=TRANSMISSION_CHOICES)
passengers = models.IntegerField("Number of passengers")
image = models.ImageField("Image", upload_to="photos/%Y/%m/%d")
def available(self, fr, to):
rents = Rent.objects.filter(car=self.category)
rents = rents.excludes(start < fr)
rents = rents.exclude(end > to)
return cont(rents)
def __unicode__(self):
return "Class " + self.category
class Rent(models.Model):
car = models.ForeignKey(Car)
start = models.DateTimeField()
end = models.DateTimeField()
childrenSeat = models.BooleanField()
extraDriver = models.BooleanField()
def __unicode__(self):
return str(self.car) + " From: " + str(self.start) + " To: " + str(self.end)
盡管我看不到錯誤與錯誤的關系,但您使用的過濾器看起來並不正確。
您可以在Car模型中將category定義為字符串:
category = models.CharField("Category",max_length=1,primary_key=True)
並在Rent模型中將car定義為外鍵:
car = models.ForeignKey(Car)
然后嘗試過濾租金:
rents = Rent.objects.filter(car=self.category)
但是汽車在這里應該是模特,而不是charfield。 也許您是想說car = self?
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