Django admin - 如果编辑对象则删除字段 [英] Django admin - remove field if editing an object

问题描述

我有一个可以通过 Django 管理区域访问的模型，如下所示:

I have a model which is accessible through the Django admin area, something like the following:

# model
class Foo(models.Model):
    field_a = models.CharField(max_length=100)
    field_b = models.CharField(max_length=100)

# admin.py
class FooAdmin(admin.ModelAdmin):
    pass

假设如果用户正在添加一个对象，我想显示 field_a 和 field_b，但如果用户正在编辑一个对象，则只显示 field_a.有没有一种简单的方法可以做到这一点，也许使用 fields 属性?

Let's say that I want to show field_a and field_b if the user is adding an object, but only field_a if the user is editing an object. Is there a simple way to do this, perhaps using the fields attribute?

如果有的话，我可以破解一个 JavaScript 解决方案，但这样做根本不对！

If if comes to it, I could hack a JavaScript solution, but it doesn't feel right to do that at all!

推荐答案

您可以为管理员创建自定义 ModelForm 以将字段拖放到 __init__

You can create a custom ModelForm for the admin to drop the field in the __init__

class FooForm(forms.ModelForm):
    class Meta(object):
        model = Foo

    def __init__(self, *args, **kwargs):
        super(FooForm, self).__init__(*args, **kwargs)
        if self.instance and self.instance.pk:
            # Since the pk is set this is not a new instance
            del self.fields['field_b']

class FooAdmin(admin.ModelAdmin):
    form = FooForm

从 John 的评论中获取关于将该字段设为只读的提示，您可以将其设为隐藏字段并覆盖 clean 以确保值不会更改.

Taking a hint from John's comment about making the field read-only, you could make this a hidden field and override the clean to ensure the value doesn't change.

class FooForm(forms.ModelForm):
    class Meta(object):
        model = Foo

    def __init__(self, *args, **kwargs):
        super(FooForm, self).__init__(*args, **kwargs)
        if self.instance and self.instance.pk:
            # Since the pk is set this is not a new instance
            self.fields['field_b'].widget = forms.HiddenInput()

    def clean_field_b(self):
        if self.instance and self.instance.pk:
            return self.instance.field_b
        else:
            return self.cleaned_data['field_b']  

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