django admin 发出警告“Field ‘X’;没有默认值”
我从现有的旧数据库中创建了两个模型，一个用于文章，一个用于可以与文章关联的标签：
class Article(models.Model):
article_id = models.AutoField(primary_key=True)
text = models.CharField(max_length=400)
class Meta:
db_table = u'articles'
class Tag(models.Model):
tag_id = models.AutoField(primary_key=True)
tag = models.CharField(max_length=20)
article=models.ForeignKey(Article)
class Meta:
db_table = u'article_tags'
我想从管理界面为一篇文章添加标签，所以我的 admin.py 文件看起来像这样：
from models import Article,Tag
from django.contrib import admin
class TagInline(admin.StackedInline):
model = Tag
class ArticleAdmin(admin.ModelAdmin):
inlines = [TagInline]
admin.site.register(Article,ArticleAdmin)
界面看起来不错，但是当我尝试保存时，我得到： /admin/webserver/article/382/ 发出警告 字段“tag_id”没有默认值
I have created two models out of an existing legacy DB , one for articles and one for tags that one can associate with articles:
class Article(models.Model):
article_id = models.AutoField(primary_key=True)
text = models.CharField(max_length=400)
class Meta:
db_table = u'articles'
class Tag(models.Model):
tag_id = models.AutoField(primary_key=True)
tag = models.CharField(max_length=20)
article=models.ForeignKey(Article)
class Meta:
db_table = u'article_tags'
I want to enable adding tags for an article from the admin interface, so my admin.py file looks like this:
from models import Article,Tag
from django.contrib import admin
class TagInline(admin.StackedInline):
model = Tag
class ArticleAdmin(admin.ModelAdmin):
inlines = [TagInline]
admin.site.register(Article,ArticleAdmin)
The interface looks fine, but when I try to save, I get:Warning at /admin/webserver/article/382/
Field 'tag_id' doesn't have a default value
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如果数据库中有一个不允许 NULL 的废弃字段，也可能会发生这种情况。
This can also happen if you have a disused field in your database that doesn't allow NULL.
问题是在数据库中，
tag_id未设置为自动增量字段。The problem was that in the DB,
tag_idwasn't set as an autoincrement field.在我的例子中，解决此问题的方法是禁用默认启用的
STRICT_TRANS_TABLESSQL 模式。What solved this issue in my case was disabling
STRICT_TRANS_TABLESSQL mode which was enabled by default.