Question

为简易缩略图添加字段

easy_thumbnail = ThumbnailerImageField(
    null=True, blank=True, verbose_name=_("Easy_Thumbnails"),
    upload_to="easy_thumbnails",
    resize_source=dict(size=(100, 100), crop="smart"),
)

执行./manage.py schemamigration test --auto时，South会产生以下迁移：

def forwards(self, orm):
    # Adding field 'Test.easy_thumbnail'
    db.add_column('test_test', 'easy_thumbnail', self.gf('django.db.models.fields.files.ImageField')(), keep_default=False)
[...]
models = {
    'test.test': {
        'Meta': {'object_name': 'Test'},
        'easy_thumbnail': ('django.db.models.fields.files.ImageField', [], {}),

执行./manage.py migrate test时，出现此错误：

The error is `django.db.utils.IntegrityError: column "easy_thumbnail" contains null values`

Answer 1

如下修改迁移脚本解决了问题：

在db.add_column
在模型中添加“'null'：'True'，'blank'：'True'”['test.test'] ['easy_thumbnail']

代码：

def forwards(self, orm):
    # Adding field 'Test.easy_thumbnail'
    db.add_column('test_test', 'easy_thumbnail', self.gf('django.db.models.fields.files.ImageField')(null=True, blank=True), keep_default=False)
[...]
models = {
    'test.test': {
        'Meta': {'object_name': 'Test'},
        'easy_thumbnail': ('django.db.models.fields.files.ImageField', [], {'null': 'True', 'blank': 'True'}),

Django South迁移错误“包含空值”，null = True字段

1 个答案: