独特的外键与Django对 [英] Unique foreign key pairs with Django

问题描述

我有三种型号：产品，用户和评论。

审查与产品和用户相关联如下：

A review is linked to a product and a user as follows:

class Review(models.Model):
    product = models.ForeignKey(Product)    
    user = models.ForeignKey(User)
    review_text = models.TextField()
    creation_date = models.DateTimeField(auto_now_add=True)

我想允许每个用户每个产品只提交一个评论。推荐的方法是什么？通过模型，通过验证，还是别的什么？我对Django / Python很新谢谢。

I'd like to allow each user to submit only one review per product. What is the recommended way to achieve this? Through the model, through verification, or something else? I'm very new to Django/Python. Thanks.

推荐答案

使用 unique_together ，以确保每个用户/产品组合是唯一的：

Use unique_together to make sure that each user/product combination is unique:

class Review(models.Model):

  class Meta:

    unique_together = ['user', 'product']

  user = models.ForeignKey(User)
  product = models.ForeignKey(Product)

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