如何在django中保存多对多的关系 [英] how to save Many to Many relationship in django

问题描述

如何为具有多个字段的Django模型创建一个对象？

从上面的问题我知道我们可以保存多对多字段后来只有。

From above question i come to know we can save Many to Many field later only.

models.py

class Store(models.Model):
   name = models.CharField(max_length=100)

class Foo(models.Model):
   file = models.FileField(upload_to='')
   store = models.ManyToManyField(Store, null=True, blank=True)

views.py

new_track.file = request.FILES['file']
new_track.save()

文件上传工作正常，然后我修改我的代码添加商店，然后我在这里...

And file uploading working fine then later i modify my code to add store then i am here...

现在我确定db return id在这里。然后我尝试使用我的下面的代码，但这只给我错误

Now i am sure db return id's here. Then i tried with my below code but that's given me error only

    x = new_track.id
    new = Foo.objects.filter(id=x)
    new.store.id = request.POST['store']
    new.save()

好，所以这里的错误是'QuerySet'对象没有属性'store'

ok so the error here is 'QuerySet' object has no attribute 'store'

而且我也尝试使用 add ，这也正在工作。
所以问题是如何保存（）

And also i tried with add that's now working either. So the question is how to save()

推荐答案

使用manytomany关系保存对象的正确方法是：

the right way of saving objects with manytomany relations would be:

...
new_track.file = request.FILES['file']
new_track.save()

new_store = Store.objects.get(id=int(request.POST['store']))
new_track.store.add(new_store)

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