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这是我的问题，我试图弄清楚成为 django 的初学者

  1. 我想user知道应用程序中的国家/地区使用外键连接到国家/地区表。用户表有 city_id 列。请注意，用户已经登录。我已经得到了城市，但没有得到国家

  2. 之后，在我的instructor应用程序中，我得到了与国家列 currency_id 相关联的货币。

这就是我所拥有的。

/instructors/model.py

from django.db import models
from locations.models import City, Country

class Class(models.Model):
   ...
   city = models.ForeignKey(City, null=True, blank=True)


class Currency(models.Model):
    name = models.CharField(max_length=20)
    symbol = models.CharField(max_length=7, help_text="Code HTML")
    initials = models.CharField(max_length=5, help_text="e.g. : CLP (Chilean Pesos)")

    class Meta:
        verbose_name_plural = "currencies"

    def __unicode__(self):
        return self.name

    def get_label(self):
        return '%s (%s)' % (self.symbol, self.initials)

/users/model.py

class User(AbstractUser):
    ...
    city = models.ForeignKey(City, blank=True, null=True, db_index=True)
    ...

    def get_locality(self):
        locality = ''
        if self.location:
            locality = '%s, %s, %s' % (self.location.name, self.location.city.name, self.city.country.name)
        elif self.city:
            locality = '%s, %s' % (self.city.name, self.city.country.name)
        return locality

/locations/model.py

from django.db import models

class Country(models.Model):
    code = models.CharField(max_length=3)
    name = models.CharField(max_length=100)
    order = models.IntegerField(default=0)
    currency_id = models.IntegerField(max_length=3)

    class Meta:
        verbose_name_plural = "countries"

    def __unicode__(self):
        return self.name


class City(models.Model):
    country = models.ForeignKey(Country)
    name = models.CharField(max_length=100)
    order = models.IntegerField(default=0)

    class Meta:
        verbose_name_plural = "cities"

    def __unicode__(self):
        return "%s, %s" % (self.name, self.country)


class Location(models.Model):
    city = models.ForeignKey(City)
    name = models.CharField(max_length=100)

    class Meta:
        verbose_name_plural = "locations"

    def __unicode__(self):
        return "%s, %s" % (self.name, self.city)
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