属性错误:';许多相关管理者';对象没有属性';添加';?我确实喜欢django网站,但出现了这个错误
错误是:属性错误:';许多相关管理者';对象没有属性';添加';?我确实喜欢django网站,但出现了这个错误,django,many-to-many,models,Django,Many To Many,Models,错误是: for item in data: category_id = item['category_id'] del item['category_id'] category = Category.objects.get(pk=category_id) code = item['code'] try: article = Article.objects.get(pk=code) except: articl
for item in data:
category_id = item['category_id']
del item['category_id']
category = Category.objects.get(pk=category_id)
code = item['code']
try:
article = Article.objects.get(pk=code)
except:
article = Article(**item)
article.save()
# at this point I have the article & category, but the next
# statement throws me an error:
category.articles.add(article)
category.save()
JamesO是正确的-看起来您的Category.articles字段具有直通关系。假设您的模型至少类似于以下内容
AttributeError: 'ManyRelatedManager' object has no attribute 'add'
然后,要将文章
添加到类别
中,您必须
class Article(models.Model):
name = models.CharField(max_length=128)
class Category(models.Model):
name = models.CharField(max_length=128)
articles = models.ManyToManyField(Article, through='Membership')
class Membership(models.Model):
article = models.ForeignKey(Article)
category = models.ForeignKey(Category)
author = models.CharField()
注意-我们无法判断通过字段调用的是什么,因此
成员资格
是一个猜测,灵感来自于您是否使用通过模型?如果是这样,则.add和.create将不起作用。使用category.articles.set(category.articles.all()| article)
在我的场景中起作用。
m = Membership(article=article, category=category, author="Dan TM")
m.save()