Django的外键

Question

的独特组合，我有4个Django模型：

class KeyOne(models.Model): 
    name = models.CharField(unique=True) 

class KeyTwo(models.Model): 
    name = models.CharField(unique=True) 

class KeyThree(models.Model): 
    name = models.CharField(unique=True) 

class KeyList(models.Model): 
    key_one = models.ForeignKey(KeyOne) 
    key_two = models.ForeignKey(KeyTwo) 
    key_three = models.ForeignKey(KeyThree) 
    list = models.CharField() 

基本上，KeyList是的KeyOne，KeyTwo和KeyThree不同组合相关的关键字的列表。我如何确保在Django Admin中只能输入独特的组合？

Answer 1

你必须在密钥列表的元类设置：

class KeyList(models.Model): 
    key_one = models.ForeignKey(KeyOne) 
    key_two = models.ForeignKey(KeyTwo) 
    key_three = models.ForeignKey(KeyThree) 
    list = models.CharField() 
    class Meta: 
     unique_together = (("key_one", "key_two", "key_three"),)