Django数据库：保存一个新条目Wtihout首先保存它的ForeignKeys

Question

假设我有这样一个模型结构：

class Cheese(Model.models):
    type = models.CharField(max_length='50')

class Sauce(Models.models):
    type = models.CharField(max_length='50')

class Pizza(Models.models):
    cheese = models.ForeignKey(Cheese)
    sauce = models.ForeignKey(Sauce)

class PizzaOrder(Models.model):
    pizza = models.ForeignKey(Pizza)
    time = models.DateTimeField(auto_now_add=True)

考虑到这一点，现在我想为PizzaOrder创建一个新条目--但我不想要奶酪、沙司或披萨的任何副本--只是PizzaOrder来表示刚刚订购的披萨。

Answer 1

如果你想避免制造重复的奶酪、酱料和披萨，你可以这样做：

class Cheese(Model.models):
    type = models.CharField(max_length='50', unique=True)

class Sauce(Models.models):
    type = models.CharField(max_length='50', unique=True)

class Pizza(Models.models):
    cheese = models.ForeignKey(Cheese)
    sauce = models.ForeignKey(Sauce)

    class Meta:
         unique_togather=(("cheese", "sauce"),)