Django 的通用更新视图：如何将值传递给隐藏的表单字段？

Question

我试图结合Django的通用UpdateView和隐藏的输入字段。我的目的是跟踪一个帖子是否被编辑后，它被创建或没有。隐藏字段名称为"updated">

views.py:

class PostUpdateView(UpdateView):
model = Post
template_name = 'journal/post_update_form.html'
form_class = PostUpdateForm
success_url = reverse_lazy('my_posts')

models.py:

class Post(models.Model):
title = models.CharField(max_length=500)
text = models.TextField(max_length=2000, null=True, blank=True)
owner = models.ForeignKey(User, on_delete=models.SET_NULL, null=True, blank=True)
#storing the link to media files in CharField
image = models.CharField(max_length=500, null=True, blank=True)
audio = models.CharField(max_length=500, null=True, blank=True)
video = models.CharField(max_length=500, null=True, blank=True)
rubric = models.CharField(max_length=100, default="No rubric", choices=RUBRIC_CHOICES)
private = models.BooleanField(default=False)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
updated = models.CharField(max_length=10, default="False")

forms.py:

from django import forms
from .models import Post
class PostUpdateForm(forms.ModelForm):
class Meta:
model = Post
fields = ["title", "text", "image", "audio", "video", "rubric", "private", "updated"]
widgets = {'updated': forms.HiddenInput(attrs={'value':"updated"})}

更新表单模板的相关部分:

<form action="" method="POST">
{% csrf_token %}
{% for field in form %}
{% if field != form.rubric and field != form.private %}
<div class="mb-3 form-group">
<label for="{{field.name}}" class="form-label">{{field.label}}</label>
{{field.errors}}
{% if field == form.text %}
<textarea type="text" class="form-control" id="{{field.name}}" name="{{field.name}}">{{field.value|default_if_none:"" }}</textarea>
{% elif field == form.updated %}
<input type="hidden" id="{{field.name}}" name="{{field.name}}" value="updated">
{% else %}
<input type="text" class="form-control" id="{{field.name}}" name="{{field.name}}" value="{{field.value|default_if_none:"" }}">
{% endif %}
</div>
<...some other fields...>
{% endif %}
{% endfor %}
<input type="submit" class="btn btn-primary" value="Update"/>
</form>

"updated"字段成功传递，但字段值是可见的(不可编辑)。在forms.py中，我试着:

• 从字段列表中排除'updated'。结果:"updated"的值。
• 使用widgets = {'updated': forms.HiddenInput}"结果:值也成功传递，但字段仍然可见。
• 只使用forms.py中的小部件，并注释掉模板中的输入字段[1]。结果:字段是可见的，可编辑的，值不保存。

[1]输入字段:

{% elif field == form.updated %}
<input type="hidden" id="{{field.name}}" name="{{field.name}}" value="updated">

我很感激任何关于这里可能有什么问题的见解。提前谢谢你。

Answer 1

在PostUpdateForm中可以这样做:

def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.fields['updated'].initial = 'updated'
self.fields['updated'].disabled = True

https://docs.djangoproject.com/en/4.1/ref/forms/fields/禁用