Django管理员内联表单，具有只读的旧值，并允许添加新的内联值 [英] Django admin inline form with readonly old values and allowing to add new inline values

问题描述

我正在尝试解决此问题，由于某种原因，到目前为止，每次尝试都失败了。我有两个简单的模型：问与答：

I am trying to figure this one out and for some reason every attempt failed so far. I have two simple models: Question and Answer:

class Question(models.Model):
    phoneID = models.CharField(max_length=255, editable=False)
    name = models.CharField(max_length=255, editable=False)
    phone = models.CharField(max_length=255, editable=False)
    message = models.TextField(editable=False)
    answered = models.DateTimeField(editable=False)
    created = models.DateTimeField(auto_now_add=True, default=datetime.utcnow())

class Answer(models.Model):
    question = models.ForeignKey(Question)
    message = models.TextField()
    created = models.DateTimeField(auto_now_add=True, default=datetime.utcnow())

由于某种原因，我无法弄清楚应该怎么做放入我的admin.py中，以将以前添加的答案以只读方式内联列出，同时允许添加新的内联答案。每次设置readonly_fields =（'message'）时，由于消息文本区域为只读，因此我无法添加新答案。

For some reason I am unable to figure out what I am supposed to put into my admin.py to have previously added answers listed inline as readonly and at the same time allow inline new answers to be added. Everytime I set readonly_fields=('message') I am not able to add a new answer because the message textarea is readonly.

推荐答案

Ok, I understand what you want. To do so you can create a special widget which will show field value and at the same time will be a hidden input. Use this widget for previous answers:

from django.forms.widgets import Widget
from django.forms.utils import flatatt
from django.utils.html import format_html

class ReadOnlyInput(Widget):

    def render(self, name, value, attrs=None):
        if value is None:
            value = ''
        final_attrs = self.build_attrs(attrs, type='hidden',
                                       name=name, value=value)
        return format_html('<input{} />{}', flatatt(final_attrs), value)


class AnswerForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):
        super(AnswerForm, self).__init__(*args, **kwargs)
        if self.instance.pk:
            self.fields['message'].widget = ReadOnlyInput()


class AnswerInline(admin.TabularInline):
    form = AnswerForm
    model = Answer

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