Question

当我进行迁移时python manage.py makemigrations wall 我在控制台中看到Django（1.8.12）告诉我一长串被触及的字段：

Migrations for 'wall':
  0079_auto_20170302_0024.py:
    - Add field periodic_task_interval to userproject
    - Alter field bank_problems on bankireference
    - Alter field bank_problems_category on bankireference
    - Alter field bank_products on bankireference
    - Alter field bank_products_category on bankireference
    - Alter field extr_category on bankireference
    - Alter field extr_words on bankireference
    - Alter field neg_features on bankireference
    - Alter field neutral_features on bankireference
    - Alter field pos_features on bankireference
    - Alter field tonality_category on bankireference
    - Alter field tonality_words on bankireference
    - Alter field bank_problems on fbpagepost
    - Alter field bank_problems_category on fbpagepost
    - Alter field bank_products on fbpagepost
    - Alter field bank_products_category on fbpagepost
    - Alter field extr_category on fbpagepost

......广告等等，靠近所有文件，即ManyToManyField。我还检查了其他迁移，看起来像随机选择字段，因为我也看到tagulous.models.fields.TagField 乃至 models.TextField。

但是，我确信没有改变那些字段，甚至触及它们

这是0079_auto_20170302_0024.py中未触及的字段：

......
    migrations.AlterField(
        model_name='userproject',
        name='description',
        field=models.TextField(default='', verbose_name='Description', blank=True, null=True),
    ),
......

我唯一做的就是添加- Add field periodic_task_interval to userproject所以其他字段 - 为什么它们出现在迁移中？由于数据库庞大，这会影响很长时间吗？

Answer 1

如果您在字段中具有choices =参数，则应以“稳定方式”（每次都相同的顺序）生成它，例如使用sorted（）

TYPES = {
    'DISTRICT': 'Округ',
    'AREA': 'Район',
    'STATION': 'Станция метро',
}
type = models.CharField(
    max_length=255,
    choices=sorted(TYPES.items()),
    default='AREA',
)

为什么Django迁移会改变未触及的字段（AlterField）？

1 个答案: