Django UpdateView未更新

Question

我创建了一个Django应用，用户可以在里面记录他们的股票交易，算是一种日记工具。当用户从首页点击某个具体的日记条目时，他们会被带到一个详细页面，展示该条目的所有信息（single_entry.html）。这个页面是通过UpdateView来处理的。在这个页面上，用户可以编辑或更新任何信息，还可以删除这个特定的条目。表单上有两个按钮，一个是“删除”，另一个是“更新”。

删除功能运行得很好。更新功能以前是可以用的，但现在不知道为什么不行了！条目的信息没有任何更新。而且我也搞不清楚为什么“消息”中间件没有在屏幕上输出。我的所有print()语句也一样，控制台上什么都没有显示。

这是我的views.py：

from django.forms.models import BaseModelForm
from django.shortcuts import render, redirect
from django.http import HttpResponse, HttpResponseRedirect
from django.views import View
from django.contrib import messages
from django.urls import reverse_lazy
from .forms import EntryForm
from .models import Entry
from django.views.generic.edit import UpdateView, DeletionMixin
from django.views.generic import DeleteView


# Create your views here. 

class EntryView(View):
  def get(self, request):
    entries = Entry.objects.all().order_by("entered_date")
    form = EntryForm()
    return render(request, "entries.html", {"form":form, "entries":entries})
  
  def post(self, request):
    form = EntryForm(request.POST, request.FILES) #must add request.FILES for uploads
    print(request.FILES)
    if form.is_valid():
      form.save()
      messages.success(request, "Entry created!")
      return redirect("/")
    else:
      messages.error(request, "Please correct the errors below.")
      return render(request, "entries.html", {"form":form})

class SingleEntryView(UpdateView):
  template_name = "single_entry.html"
  model = Entry
  fields = ['ticker', 'strategy', 'result', 'comments', 'image']
  success_url = '/'
  form = EntryForm

  def post(self, request, *args, **kwargs):
        if 'delete_button' in self.request.POST:
            self.object = self.get_object()
            self.object.delete()
            messages.success(request, "Entry has been deleted")
            return HttpResponseRedirect(self.get_success_url())
        elif 'update_button' in self.request.POST:  
            return super().post(request, *args, **kwargs)
        return redirect('/')

  def form_valid(self, form):
    form.instance.user = self.request.user
    return super().form_valid(form)

这是urls.py：

from django.urls import path
from django.contrib import admin
from . import views

urlpatterns = [
    path("", views.EntryView.as_view(), name="index"),
    path("entries/<int:pk>/", views.SingleEntryView.as_view(), name="single-entry"),
    path("admin/", admin.site.urls)
]

这是single_entry.html：

{% extends 'base.html' %}



{% if messages %}
<ul class="messages">
    {% for message in messages %}
    <li{% if message.tags %} class="{{ message.tags }}"{% endif %}>{{ message }}</li>
    {% endfor %}
</ul>
{% endif %}

{% block title %}
    Trading Journal - Entry
{% endblock title %}Trading Journal

{% block content %}

<form method="POST" action="">
    {% csrf_token %}
    {% for field in form %}
        {{field.label_tag}}
        {{field}}
        {% if field.errors %}
            <small class="error">{{ field.errors|striptags }}</small>            
        {% endif %}
    {% endfor %}
    <button type="submit" name="update_button">Save</button>
    <button tyupe="submit" name="delete_button">Delete</button>

</form>    

<!-- {% if entry.image.url != Null %} -->
    <img src="{{ entry.image.url }}" alt="{{ entry.result }}">
        <!-- {% else %} -->
    <img src="", alt="{{ entry.result }}">
<!-- {% endif %} -->

{% endblock content %}

Models.py：

from django.db import models
from django.core.validators import MinValueValidator, MaxValueValidator
from django.urls import reverse
from django.utils.text import slugify


class Entry(models.Model):
    ONEORB="1-Min ORB"
    FIVEORB="5-Min ORB"
    ABCD="ABCD"
    REVERSAL="Reversal"
    PROFIT="Profit"
    LOSS="Loss"
    RESULT_CHOICES = (
        (PROFIT, "Profit"),
        (LOSS, "Loss")
    )
    STRATEGY_CHOICES = (
        (ONEORB,"1-Min ORB"),
        (FIVEORB,"5-Min ORB"),
        (ABCD,"ABCD"),
        (REVERSAL,"Reversal")
    )

    entered_date=models.DateField(auto_now_add=True)
    ticker=models.CharField(max_length=8, default="")
    strategy=models.CharField(max_length=12, choices=STRATEGY_CHOICES, default="ONEORB")
    result=models.CharField(max_length=6, choices=RESULT_CHOICES, default="PROFIT")
    comments=models.TextField(max_length=300, blank=True)
    image = models.ImageField(upload_to="", null=True, blank=True) #will save to default BASE_DIR which is 'uploads'

    def __str__(self):
        return f"{self.result} {self.entered_date}"

Forms.py：

from django import forms
from .models import Entry

class EntryForm(forms.ModelForm):
    class Meta:
        model=Entry
        fields='__all__'

我本来期待UpdateView能够用新的信息来更新条目信息。

django 模板渲染表单处理用户交互视图函数数据库更新 updateview 消息中间件

Django UpdateView未更新

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