django 模型在每次迁移时都会收到 Alter Field 警报

Question

每次运行命令时，我都会收到更改归档警报，python manage.py makemigrations我还会删除数据库旧迁移文件，但警报仍然存在，有人知道我该如何解决这个问题吗？

Migrations for 'assignment':
  assignment/migrations/0012_auto_20201016_0754.py
    - Alter field city on assignment
    - Alter field status on assignment

class Assignment(models.Model):

    CITY_SELECT = {
        ('i', 'Islamabad'),
        ('l', 'Lahore'),
        ('m', 'Multan'),
        ('k', 'Karachi'),
        ('q', 'Queta'),
        ('p', 'Pashawar')
    }

    STATUS_SELECT = {
        ('p', 'Pendding'),
        ('d', 'Done'),
        ('i', 'In field'),
        ('c', 'Cancel')
    }

    place = models.CharField(max_length=100)
    desc = models.CharField(max_length=500)
    reporter = models.ForeignKey(User, on_delete=models.SET_NULL, null=True)
    created_on = models.DateTimeField(auto_now_add=True)
    assign_time = models.DateTimeField(auto_now=False, null=True)
    city = models.CharField(choices=CITY_SELECT, max_length=9)
    status = models.CharField(choices=STATUS_SELECT, max_length=8)

Answer 1

很可能该集合每次都以不同的顺序“洗牌”，从而导致choices不可预测的情况。如果多次运行Python进程，每次的哈希常量都是不同的。您可以使用列表，这将确保顺序始终相同：

class Assignment(models.Model):
    
    CITY_SELECT = [  # ← use a list
        ('i', 'Islamabad'),
        ('l', 'Lahore'),
        ('m', 'Multan'),
        ('k', 'Karachi'),
        ('q', 'Queta'),
        ('p', 'Pashawar')
    ]
    
    STATUS_SELECT = [  # ← use a list
        ('p', 'Pendding'),
        ('d', 'Done'),
        ('i', 'In field'),
        ('c', 'Cancel')
    ]

    place = models.CharField(max_length=100)
    desc = models.CharField(max_length=500)
    reporter = models.ForeignKey(User, on_delete=models.SET_NULL, null=True)
    created_on = models.DateTimeField(auto_now_add=True)
    assign_time = models.DateTimeField(auto_now=False, null=True)
    city = models.CharField(choices=CITY_SELECT, max_length=9)
    status = models.CharField(choices=STATUS_SELECT, max_length=8)