如何在Django的GenericStackedInline Admin中访问请求对象

Question

在Django 1.9（python3.4）中使用GenericStackedInline我想在Django管理中保存我的模型之前访问请求对象。在

当使用MediaItemAdmin时，我可以在obj.save()运行之前截获save函数，如下例所示：

管理员py

class StuffAdmin(admin.ModelAdmin):
    def save_model(self, request, obj, form, change):
        # Do some stuff here like obj.user = request.user before saving.
        obj.save()

但是，使用GenericStackedInline时，相同的行为或“钩子”是不可用的。它似乎直接调用模型保存方法：

管理员py

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据我所知，GenericStackedInline继承自form，因此我还尝试使用一个表单并重写它，如本例所示：

管理员py

class StuffAdmin(GenericStackedInline):
    model = StuffModel
    form = StuffForm

class StuffForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(StuffForm, self).__init__(*args, **kwargs)

    def save_model(self, request, obj, form, change):
        print("Still not run!(")
        obj.save()

    def save_form(self, request, obj, form, change):
        print("Work already!")
        obj.save()

我搜索过stackoverflow，但是大多数都没有答案，如这里所示accessing request object within a django admin inline model或者说使用init来做类似self.request = kwargs.pop('request')的事情，但是，request从来没有在这里传递，对吧？在

不管怎样，在调用model save（）之前，你知道如何调用request对象并更新我的实例吗？在

Answer 1

保存“inlines”的方法是ModelAdmin的一部分，而不是{}。在

class BarInline(GenericStackedInline):
    model = Bar

class FooModelAdmin(ModelAdmin):
    model = Foo
    inlines = [BarInline]

    def save_formset(self, request, form, formset, change):
        """
        `form` is the base Foo form
        `formset` is the ("Bar") formset to save
        `change` is True if you are editing an existing Foo,
                    False if you are creating a new Foo
        """
        if formset_matches_your_inline_or_some_requirement(formset):
            do_something_with(request)
        super().save_formset(request, form, formset, change)

如果要检查窗体集是否是BarInline的窗体集，可以执行以下操作：

^{pr2}$

或者更棒的是，让它通用：

class BarInline(GenericStackedInline):
    model = Bar

    def pre_save_formset(self, request, form, model_admin, change):
       """Do something here with `request`."""

class FooModelAdmin(ModelAdmin):
    model = Foo
    inlines = [BarInline]

    def save_formset(self, request, form, formset, change):
        if hasattr(formset, 'pre_save_formset'):
            formset.pre_save_formset(request, form, self, change)
        super().save_formset(request, form, formset, change)
        if hasattr(formset, 'post_save_formset'):
            formset.post_save_formset(request, form, self, change)

---

如果您需要在每次保存表单之前而不是在每个表单集之前处理请求，则必须使用您自己的表单，并且表单集通过表单集将请求传播到表单：

from django.forms import ModelForm
from django.forms.models import BaseInlineFormSet

class BarForm(ModelForm):
    model = Bar

    def __init__(self, *args, **kwargs):
        request = kwargs.pop('request', None)
        super().__init__(*args, **kwargs)
        self.request = request

    def save(self, commit=True):
        print(self.request)
        print(self.instance)
        obj = super().save(False)  # Get object but don't save it
        do_something_with(self.request, obj)
        if commit:
            obj.save()
            self.save_m2m()
        return obj

class BarFormSet(BaseInlineFormSet):

    @property
    def request(self):
        return self._request

    @request.setter
    def request(self, request):
        self._request = request
        for form in self.forms:
            form.request = request

class BarInline(GenericStackedInline):
    codel = Bar
    form = BarForm
    formset = BarFormSet


class FooModelAdmin(ModelAdmin):
    inlines = [BarInline]

    def _create_formsets(self, request, obj, change):
        formsets, inline_instances = super()._create_formsets(request, obj, change)
        for formset in formsets:
            formset.request = request
        return formsets, inline_instances

根据您的用例，save方法也可能看起来像这样：

class BarForm(ModelForm):
    model = Bar

    def save(self, commit=True):
        do_something_with(self.request, self.instance)
        return super().save(commit)  # Get object but don't save it

Answer 2

管理类不是从表单继承的；它们包含表单。ModelForms没有save_model或save_form方法，它们只有一个save方法。完全可以重写该方法，但它不接受request；您还需要重写__init__来接受该参数并从modeldadmin的get_form_kwargs方法传入。在