Django admin error ValidationError: ['ManagementForm data is missing or has been tampered with'] due to conditional inline use

Question

我有一个自定义 User 模型 (AbstractUser) 和一个 Stock 模型。假设有多个用户角色 manager, supplier 等。经理可以查看其他 经理的详细信息和供应商详细信息 .

User 模型有一个 条件内联 ，如果用户角色等于 supplier，它显示每个供应商的库存.(这里的角色是一个 PositiveSmallIntegerField 有选择和 SUPPLIER = 2)

class SupplierStockInline(admin.StackedInline):
    """ Inline to show stocks of a supplier """

    model = Stock
    extra = 0


@admin.register(User)
class UserAdmin(UserAdmin):
    """ User """

    fieldsets = [
        (None, {'fields': ('username', 'password')}),
        ('Personal info', {'fields': (
            'first_name',
            'last_name',
            'email',
            ... some custom fields...
        )}),
        ('Permissions', {'fields': (
            'is_active',
            'is_staff',
            'is_superuser',
            'role',
            'groups',
            'user_permissions',
        )}),
        ('Important dates', {'fields': ('last_login', 'date_joined')})
    ]

    list_display = [...]
    search_fields = [...]

    # --- the source of the problem ---

    inlines = []

    def get_inlines(self, request, obj):
        """ Show inlines, stocks of supplier """
        try:
            if obj.role == SUPPLIER:
                return [SupplierStockInline]
        except:
            pass
        return []
    # --- ---- -----

在我尝试将新用户的角色更改为 supplier 之前，它工作得很好。

ValidationError: ['ManagementForm data is missing or has been tampered with']

问题是由于被覆盖的 get_inlines() 方法引起的。当我注释掉 get_inlines() 时它工作正常并且这只发生在角色 supplier 上。我试图解决这个问题，但无法提出解决方案。

希望得到解决问题的指导，在此先感谢。

Answer 1

经过几个小时的研究终于找到了一个solution，虽然我不能确切地解释为什么会这样（可能与没有相关的库存实例有关，并且在转换为角色供应商时突然与库存实例有关系）。

总之，不用覆盖get_inlines()方法，覆盖change_view()并使用条件方法可以解决问题，

class UserAdmin(admin.ModelAdmin):
    ...
    inlines = []

    def change_view(self, request, object_id, form_url='', extra_context=None):
        self.inlines = []
    
        try:
            obj = self.model.objects.get(pk=object_id)
        except self.model.DoesNotExist:
            pass
        else:
            if obj.role == SUPPLIER:
                self.inlines = [SupplierStockInline,]
        return super(UserAdmin, self).change_view(request, object_id, form_url, extra_context)

Django admin error ValidationError: ['ManagementForm data is missing or has been tampered with'] due to conditional inline use

Django admin error ValidationError: ['ManagementForm data is missing or has been tampered with'] due to conditional inline use

django

django-models

django-admin

django-admin-tools