Django ManyToManyField 如何添加 created_at 和 updated_at

Question

如何将 created_at 和 updated_at 字段添加到我的 ManyToManyField？

class Profile (models.Model):  
  created_at = models.DateTimeField(auto_now_add=True)
  updated_at = models.DateTimeField(auto_now=True)

class Group(models.Model):
  created_at = models.DateTimeField(auto_now_add=True)
  updated_at = models.DateTimeField(auto_now=True)
  profiles = models.ManyToManyField(Profile, related_name='groups')

Answer 1

您需要使用名为 though 的参数覆盖 ManyToManyField。
更多信息 here

class Group(models.Model):
  created_at = models.DateTimeField(auto_now_add=True)
  updated_at = models.DateTimeField(auto_now=True)
  profiles = models.ManyToManyField(Profile, related_name='groups',
                    <b>through='GroupProfileRelationship'</b>)

class Profile (models.Model):  
    # fields

下面是直通模型

<b>class GroupProfileRelationship(models.Model):</b>
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    profile = models.ForeignKey(Profile, on_delete=models.CASCADE)
    group = models.ForeignKey(Group, on_delete=models.CASCADE)

Note that some options will no longer available. such as add() remove()

Really important to take a look at the official documentation here

Django ManyToManyField 如何添加 created_at 和 updated_at

Django ManyToManyField how to add created_at and updated_at

django

django-models

django-orm