[英]Disallow Django self-referential foreign key to point to self object
我有一個常規的自我引用外鍵:
idol = models.ForeignKey("self", on_delete=models.CASADE)
管理頁面允許我選擇相同的對象ID。 如何阻止django管理員表單顯示?
您可以在ModelAdmin
類的子類中覆蓋formfield_for_foreignkey
。
ModelAdmin上的formfield_for_foreignkey方法允許您覆蓋外鍵字段的默認表單字段。
父對象id可以保存在change_view
方法中:
class IdolAdmin(admin.ModelAdmin):
def change_view(self, request, object_id, form_url='', extra_context=None):
self.object_id = object_id
return super(IdolAdmin, self).change_view(
request, object_id, form_url, extra_context=extra_context,
)
def formfield_for_foreignkey(self, db_field, request, **kwargs):
if db_field.name == "idol":
kwargs['queryset'] = Idol.objects.exclude(pk=self.object_id)
return super(IdolAdmin, self).formfield_for_foreignkey(
db_field, request, **kwargs)
您應該能夠將模型管理員的表單設置為包含修改的自定義表單
class ModelAdmin...
form = MyModelForm
我想這個表格看起來像這樣
class MyModelForm(ModelForm)
class Meta:
model = MyModel
def __init__(self, *args, **kwargs):
super(MyModelForm, self).__init__(*args, **kwargs)
if self.instance.pk:
query = self.fields['my_field'].queryset
self.fields['my_field'].queryset = query.exclude(id=self.instance.id)
您可以擴展render_change_form
。
class IdolAdmin(admin.ModelAdmin):
def render_change_form(self, request, context, *args, **kwargs):
queryset = context['adminform'].form.fields['idol'].queryset
original_id = context.get('original', None)
if(original_id):
context['adminform'].form.fields['idol'].queryset = queryset.exclude(id=original_id.id)
return super(IdolAdmin, self).render_change_form(request, context, args, kwargs)
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