Django InlineModelAdmin - 在保存请求时设置内联字段(自动设置用户字段)(save_formset vs save_model)

Question

我有两个模型,一个MainModel和一个相关的InlineModel,我想在管理员中显示为内联.此InlineModel可用于,例如,记录模型,并应跟踪登录的管理员用户进行更改.虽然这看起来很简单(事实上,当用户字段是MainModel的一部分时,文档显示了这个例子),当字段在Inline上时,我似乎无法掌握它.

具体来说,我的目标是:

1. 用户编辑MainModel
2. 用户添加InlineModel,而不是填写用户字段
3. 用户按下保存
4. 代码填写新创建的InlineModel实例的用户字段
5. (Bonus!用户字段对于现有实例是只读的,对于新的内联是隐藏的)

我的问题是:

1. 它是否正确？对于InlineModelAdmin实例,不会调用它太bas save_model
2. 这样做是否允许我保存而不会导致错误？(用户是必需的,验证标记它)
3. 如何隐藏新内联的用户输入字段,并将其只读为现有内联？

以下是我目前的想法:

---

#models.py
class MainModel(models.Model):
    some_info = models.IntegerField()

class InlineModel(models.Model):
    main = models.ForeignKey(MainModel)
    data = models.CharField(max_length=255)
    user = models.ForeignKey('auth.User')

#admin.py
class InlineModelInline(admin.TabularInline):
    model = InlineModel
    fields = ('data', 'user')
    #readonly_fields = ('data', 'user') #Bonus question later

class MainModelAdmin(admin.ModelAdmin):
    list_display = ('id', 'some_info')
    inlines = [InlineModelInline]

    #def save_model(self, request, obj, form, change):
        #http://docs.djangoproject.com/en/dev/ref/contrib/admin/#django.contrib.admin.ModelAdmin.save_model
        #Only called for MainModel, not for any of the inlines
        #Otherwise, would be ideal

    def save_formset(self, request, form, formset, change):
        #http://docs.djangoproject.com/en/dev/ref/contrib/admin/#django.contrib.admin.ModelAdmin.save_formset
        #Experimenting showd this is called once per formset (where the formset is a group of inlines)
        #See code block at http://code.djangoproject.com/browser/django/tags/releases/1.2.1/django/contrib/admin/options.py#L894
        if not isinstance(formset.model, InlineModel):
            return super(MainModelAdmin, self).save_formset(request, form, formset, change)
        instances = formset.save(commit=False)
        for instance in instances:
            if not instance.pk:
                instance.user = request.user
        instance.save()
        formset.save_m2m()

Answer 1

我已经解决了问题的前半部分:

def save_formset(self, request, form, formset, change):
    if formset.model != InlineModel:
        return super(MainModelAdmin, self).save_formset(request, form, formset, change)
    instances = formset.save(commit=False)
    for instance in instances:
        if not instance.pk:
            instance.user = request.user
        instance.save()
    formset.save_m2m()

现在我对奖金行为感兴趣:

1. 由于验证规则,我需要在添加新内联时选择用户.我最好的猜测是不在我的InlineModelInline.fields元组中包含'user'字段,但是这不会向作者显示现有的InlineModel实例.(编辑:将'user'添加到readonly_fields在这里工作)

2. (编辑)如何使现有内联呈现'数据'为只读,但在添加新内联时仍能编辑它？