Question

我已经阅读了Django中关于ManyToMany关系的所有内容，但到目前为止，我没有看到任何解决我的具体问题的问题，即Django处理的简单ManyToMany和ManyToMany-Through关系毫不费力地靠自己。

考虑这些模型：

class Treatment(models.Model):
    ...
    book = models.ManyToManyField(Book, through='TreatmentLocation')
    category = models.ManyToManyField(Category)

class Book(models.Model):
    name = models.CharField(...)

class TreatmentLocation(models.Model):
    treatment = models.ForeignKey(Treatment)
    book = models.ForeignKey(Book)
    page = models.CharField(...)

class Category(models.Model):
    name = models.CharField(...)

我已经很好地获得了POST数组中的数据，但是查看视图却很棘手。

def save_treatment(request):
    form = TreatmentForm(request.POST)

    if form.is_valid():
        treatment = form.save()

        pages = request.POST.getlist('page')
        books = request.POST.getlist('book')

        counter = 0
        for page in pages:
            book_id = books.__getitem__(counter)
            TreatmentLocation.objects.create(treatment_id=treatment.id, book_id=book_id, page=page)
            counter = counter + 1

        form.save_m2m()
    else:
        ...

治疗保存成功，与TreatmentLocations一样，但是一旦我尝试调用save_m2m（）来存储治疗类别外部参照，我就会收到Cannot set values on a ManyToManyField which specifies an intermediary model. Use TreatmentLocation Manager错误。

有谁知道如何保存这两件事？我想避免诉诸原始SQL。

Answer 1

为什么不从through删除ManyToManyField ModelForm？

class MyForm(forms.ModelForm):
    class Meta:
        exclude = ('book',)
        model = Treatment

如何使用manyToMany Through关系保存django模型，并定期执行manyToMany关系

1 个答案: