仅在 Django admin inline 中对现有项目只读 [英] Readonly for existing items only in Django admin inline

问题描述

我在 Django 管理员中有一个表格内联模型.我需要其中 1 个字段在创建后不可更改，但将其设置为只读(通过 readonly_fields)可以正常工作，但在单击添加另一个项目"而不是下拉菜单时将字段转换为标签.

I have a tabular inline model in the Django admin. I need 1 of the fields to not be changeable after it has been created, but setting it as readonly (via readonly_fields) which works fine, but turns the field into a label when clicking 'Add another item' instead of a dropdown.

有没有办法让字段保持只读，但仍允许使用正确的字段输入创建新项目?

Is there a way to keep a field readonly, but still allow new items to be created with the proper field input?

谢谢！

托马斯

通过自定义小部件设法弄清楚

Managed to figure it out by way of a custom widget

class ReadOnlySelectWidget(forms.Select):
    def render(self, name, value, attrs=None):
        if value:
            final_attrs = self.build_attrs(attrs, name=name)
            output = u'<input value="%s" type="hidden" %s />' % (value, flatatt(final_attrs))
            return mark_safe(output + str(self.choices.queryset.get(id=value)))
        else:
            return super(ReadOnlySelectWidget, self).render(name, value, attrs)

如果有值，它只会将其变为隐藏，并非在所有情况下都有效(仅适用于 1 个只读字段).

It just turns it into a hidden if there is a value, won't work in every situation (only really works with 1 read only field).

推荐答案

遇到同样的问题，我遇到了这个问题:

Having the same problem, I came across this fix:

创建两个内联对象，一个没有更改权限，另一个所有字段都是只读的.将两者都包含在模型管理中.

Create two inline objects, one with no change permission, and the other with all the fields read-only. Include both in the model admin.

class SubscriptionInline(admin.TabularInline):
    model = Subscription
    extra = 0
    readonly_fields = ['subscription', 'usedPtsStr', 'isActive', 'activationDate', 'purchaseDate']

    def has_add_permission(self, request):
        return False

class AddSupscriptionInline(admin.TabularInline):
    model = Subscription
    extra = 0
    fields = ['subscription', 'usedPoints', 'isActive', 'activationDate', 'purchaseDate']

    def has_change_permission(self, request, obj=None):
        return False

    # For Django Version > 2.1 there is a "view permission" that needs to be disabled too (https://docs.djangoproject.com/en/2.2/releases/2.1/#what-s-new-in-django-2-1)
    def has_view_permission(self, request, obj=None):
        return False

将它们包含在同一个模型管理员中:

Include them in the same model admin:

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

要添加新订阅，我在管理中使用 AddSubscriptionInline.保存后，新订阅将从该内联中消失，但现在确实以只读形式出现在 SubscriptionInline 中.

To add a new subscription I use the AddSubscriptionInline in the admin. Once it is saved, the new subscription disappears from that inline, but now does appear in the SubscriptionInline, as read only.

对于SubscriptionInline，重要的是要提及extra = 0，这样它就不会显示垃圾只读订阅.最好也隐藏 SubscriptionInline 的添加选项，只允许通过 AddSubscriptionInline 添加，方法是将 has_add_permission 设置为始终返回 错误.

For SubscriptionInline, it is important to mention extra = 0, so it won't show junk read-only subscriptions. It is better also to hide the add option for SubscriptionInline, to allow adding only via AddSubscriptionInline, by setting the has_add_permission to always return False.

一点也不完美，但它对我来说是最好的选择，因为我必须提供在用户管理页面上添加订阅的功能，但添加后，只能通过内部应用逻辑进行更改.

Not perfect at all, but it's the best option for me, since I must provide the ability to add subscriptions on the user admin page, but after one is added, it should be changed only via the internal app logic.

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