python - Django Models.py 数据库设计反馈

Question

基于我的 previous question和我收到的反馈 我重新设计了我的模型，在运行“syncdb”之前需要一些反馈。

我主要关心的是 ForeignKeys 和 Restaurant 表中的 ManyToManyField。 ManyTomany 字段是否也应该具有 through='' 值以及该值应该是多少？

欢迎任何反馈!

模型

class Restaurant(models.Model):
    id = models.AutoField(primary_key=True, db_column='id')
    name = models.CharField(max_length=50L, db_column='name', blank=True)
    address = models.CharField(max_length=100L, blank=True)
    city_id = models.ForeignKey('City', related_name="restaurant_city")
    location_id = models.ForeignKey('Location', related_name="restaurant_location")
    hood_id = models.ForeignKey('Hood', null=True, blank=True, related_name="restaurant_hood")
    listingrole_id = models.ForeignKey('Listingrole', related_name="restaurant_listingrole")
    cuisine_types = models.ManyToManyField('Cuisinetype', null=True, blank=True, related_name="restaurant_cuisinetype")
    class Meta:
        db_table = 'restaurant'

class City(models.Model):
    id = models.AutoField(primary_key=True, db_column='id')
    name = models.CharField(max_length=50L, db_column='city')
    state = models.CharField(max_length=50L, db_column='state', blank=True, null=True)
    class Meta:
        db_table = 'city'

class Cuisinetype(models.Model):
    id = models.AutoField(primary_key=True, db_column='id')
    name = models.CharField(max_length=50L, db_column='cuisine', blank=True) # Field name made lowercase.
    class Meta:
        db_table = 'cuisinetype'

class Location(models.Model):
    id = models.AutoField(primary_key=True, db_column='id')
    name = models.CharField(max_length=50L, db_column='location', blank=False, null=False)
    city = models.ForeignKey('City', related_name="location_city")
    class Meta:
        db_table = 'location'

class Hood(models.Model):
    id = models.AutoField(primary_key=True, db_column='id')
    name = models.CharField(max_length=50L, db_column='hood')
    city = models.ForeignKey('City', related_name='hood_city')
    location = models.ForeignKey('Location', related_name='hood_location')
    class Meta:
        db_table = 'hood'    

class Listingrole(models.Model):
    id = models.AutoField(primary_key=True, db_column='id')
    name = models.CharField(max_length=50L, db_column='listingrole', blank=True) # Field name made lowercase.
    class Meta:
        db_table = 'listingrole'
....

Answer 1

考虑到 coisine_types 的概念和含义，您不必使用 through 关键字建立关系。当有一些关于关系自身的信息时，您(主要)使用它。

根据 Django 文档:

The most common use for this option is when you want to associate extra data with a many-to-many relationship.

请参阅此处的解释:Extra fields on many-to-many relationships