我怎样才能获得外键值？ 我有一个链接到一年，系列，发动机型号，机身风格，变速箱和传动系统......所有的外键一个共同的车型。 我想获得这些字段的值，我的应用程序，但我坚持，我怎么会去他们。 任何想法将不胜感激。
class Model(models.Model):
model = models.CharField(max_length=15, blank=False)
manufacturer = models.ForeignKey(Manufacturer)
date_added = models.DateField()
def __unicode__(self):
name = ''+str(self.manufacturer)+" "+str(self.model)
return name
class Year(models.Model):
ALPHA_NUMERIC_CHOICES = (
('1', 'Numeric'),
('A', 'Alphabetic'),
)
year = models.PositiveSmallIntegerField()
position_7_char = models.CharField(max_length=1, choices=ALPHA_NUMERIC_CHOICES)
position_10 = models.CharField(max_length=1, blank=False)
def __unicode__(self):
return unicode(self.year)
class Series(models.Model):
series = models.CharField(max_length=20, blank=True)
model = models.ForeignKey(Model)
date_added = models.DateField()
def __unicode__(self):
name = str(self.model)+" "+str(self.series)
return name
class CommonVehicle(models.Model):
year = models.ForeignKey(Year)
series = models.ForeignKey(Series)
engine = models.ForeignKey(Engine)
body_style = models.ForeignKey(BodyStyle)
transmission = models.ForeignKey(Transmission)
drive_train = models.ForeignKey(DriveTrain)
def __unicode__(self):
name = ''+str(self.year)+" "+str(self.series)
return name
class Vehicle(models.Model):
stock_number = models.CharField(max_length=6, blank=False)
vin = models.CharField(max_length=17, blank=False)
common_vehicle = models.ForeignKey(CommonVehicle)
exterior_colour = models.ForeignKey(ExteriorColour)
interior_colour = models.ForeignKey(InteriorColour)
interior_type = models.ForeignKey(InteriorType)
odometer_unit = models.ForeignKey(OdometerUnit)
status = models.ForeignKey(Status)
odometer_reading = models.PositiveIntegerField()
selling_price = models.PositiveIntegerField()
purchase_date = models.DateField()
sales_description = models.CharField(max_length=60, blank=False)
def __unicode__(self):
return self.stock_numberodels.ForeignKey(CommonVehicle)
