Question

我想创建诸如{id，project_id}之类的复合主键。我删除旧表（全部）。当我这样做时：

AssertionError: Model mdm.Group can't have more than one AutoField.

我有一个错误：

id = models.AutoField(db_index=True, primary_key=False)

更改我的模型：

constraints = [
        models.UniqueConstraint(
            fields=['id', 'project_id'], name='unique_group_project'
        )
    ]

并将复合主键添加为

By default, Django gives each model the following field:

id = models.AutoField(primary_key=True)

This is an auto-incrementing primary key.

If you’d like to specify a custom primary key, just specify primary_key=True on one of your fields. If Django sees you’ve explicitly set Field.primary_key, it won’t add the automatic id column.

Each model requires exactly one field to have primary_key=True (either explicitly declared or automatically added).

来自文档：

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我只是不明白问题所在。如果添加AutoField，则必须为PK。如何解决Autofield ID和复合PK（ID，project_id）的问题？

Django的。创建复合主键

0 个答案: