使用内联表单中的额外字段 - save_model,save_formset,无法理解差异

Question

假设我处于通常情况下,在many2many关系中有额外的字段:

class Person(models.Model):
    name = models.CharField(max_length=128)

class Group(models.Model):
    name = models.CharField(max_length=128)
    members = models.ManyToManyField(Person, through='Membership')

class Membership(models.Model):
    person = models.ForeignKey(Person)
    group = models.ForeignKey(Group)
    date_joined = models.DateField()
    invite_reason = models.CharField(max_length=64)

# other models which are unrelated to the ones above..

class Trip(models.Model):
  placeVisited  = models.ForeignKey(Place)
  visitor  = models.ForeignKey(Person)
 pleasuretrip = models.Boolean()

class Place(models.Model):
  name = models.CharField(max_length=128)

我想在会员表单中添加一些通过内联显示的额外字段.这些字段基本上是另一个模型(Trip)实例化的快捷方式.Trip可以拥有自己的管理员视图,但需要这些快捷方式,因为当我的项目合作伙伴在系统中输入"会员"数据时,他们碰巧也有"旅行"信息(并且还因为会员资格中的某些信息可能只是被复制到旅行等.).

因此,所有我想有在籍内嵌了两个附加字段- placeVisited和pleasuretrip -这与Person实例在一起会让我实例在后台旅行模式 ...

我发现通过定义自己的表单,我可以轻松地将额外的字段添加到内联视图中.但是一旦输入数据,如何以及何时引用它们以执行我需要执行的保存操作？

class MyForm(forms.ModelForm):
 place = forms.ModelChoiceField(required=False, queryset=Place.objects.all(), label="place",)
 pleasuretrip = forms.BooleanField(required=False, label="...")

class MembershipInline(admin.TabularInline):
 model = Membership
 form = MyForm
    def save_model(self, request, obj, form, change):
        place = form.place
        pleasuretrip = form.pleasuretrip
        person = form.person
        ....
        # now I can create Trip instances with those data
        ....
        obj.save()

class GroupAdmin(admin.ModelAdmin):
 model = Group
 ....
 inlines = (MembershipInline,)

这似乎不起作用......我也对save_formset方法感到有些困惑......也许是我应该使用的那个？非常感谢您的帮助!!!!

Answer 1

正如syn在他的回答中指出的那样,对于TabularInline和StackedInline,你必须覆盖包含内联的ModelAdmin中的save_formset方法.

GroupAdmin(admin.ModelAdmin):
    model = Group
    ....
    inlines = (MembershipInline,)

    def save_formset(self, request, form, formset, change):
        instances = formset.save(commit=False)

        for instance in instances:
            if isinstance(instance, Member): #Check if it is the correct type of inline
                if(not instance.author):
                    instance.author = request.user
                else:
                    instance.modified_by = request.user            
                instance.save()

Answer 2

我刚刚遇到了同样的问题，似乎解决方案是对于带有内联的 save_formset 和 save_model ，它们都不会被调用。相反，您必须在正在调用的父表单集中实现它，例如

model = Group
    ....
    inlines = (MembershipInline,)

    def save_formset(self, request, form, formset, change):
        instances = formset.save(commit=False)

        for instance in instances:
            # Here an instance is a MembershipInline formset NOT a group...
            instance.someunsetfield = something

            # I think you are creating new objects, so you could do it here.
            instance.save()