Django 在内联表单管理中获取实例

有一个内联表单类：

class ItemColorSelectForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(ItemColorSelectForm, self).__init__(*args, **kwargs)
        #here i need current object

内联类：

class ItemColorSelectInline(generic.GenericTabularInline):
    model = ColorSelect
    extra = 1
    form = ItemColorSelectForm

管理班

class ItemAdmin(admin.ModelAdmin):
    inlines = [ItemColorInline,]

问题：如何获取当前对象ItemColorSelectForm.

print kwargs return:

{'auto_id': u'id_%s', 'prefix': u'catalog-colorselect-content_type-object_id-__prefix__', 'empty_permitted': True}

目前接受的解决方案不是线程安全的。如果您关心线程安全，则永远不要将实例分配给静态类属性。

线程安全的解决方案有：

For 姜戈 1.7 （可能是早期版本，不清楚）：

from django.utils.functional import cached_property

def get_formset(self, *args, **kwargs):
    FormSet = super(InlineAdmin, self).get_formset(*args, **kwargs)

    class ProxyFormSet(FormSet):
        def __init__(self, *args, **kwargs):
            self.instance = kwargs['instance']
            super(ProxyFormSet, self).__init__(*args, **kwargs)

        @cached_property
        def forms(self):
            kwargs = {'instance': self.instance}
            forms = [self._construct_form(i, **kwargs) 
                    for i in xrange(self.total_form_count())]
            return forms
    return ProxyFormSet

As of 姜戈 >= 1.9也可以传递 form_kwargs：

def get_formset(self, *args, **kwargs):
    FormSet = super(InlineAdmin, self).get_formset(*args, **kwargs)

    class ProxyFormSet(FormSet):
        def __init__(self, *args, **kwargs):
            form_kwargs = kwargs.pop('form_kwargs', {})
            form_kwargs['instance'] = kwargs['instance']
            super(ProxyFormSet, self).__init__(
                *args, form_kwargs=form_kwargs, **kwargs)
    return ProxyFormSet

上述解决方案将使 kwarg 实例以模型形式可用：

class InlineForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(InlineForm, self).__init__(*args, **kwargs)
        print('instance', kwargs['instance'])