我有一个表单,我想用用户之前的输入来预先填写。我使用 Form(instance = object)
代码来做到这一点。但是,在用户提交表单后,先前的表单条目将被新的表单条目更新。我不希望这样,相反,我希望它创建一个不同的实例,以便跟踪更改历史记录。有什么办法可以做到这一点,同时仍然能够预先填写表格吗?
查看.py
from django.shortcuts import render, redirect
from .models import Topic, Entry
from .forms import TopicForm, EntryForm
def edit_entry(request, entry_id):
entry = Entry.objects.get(id = entry_id)
topic = entry.topic
if request.method != 'POST':
# Initial request; pre-fill for with the current entry.
form = EntryForm(instance = entry)
else:
# POST data submitted.
form = EntryForm(instance = entry, data = request.POST)
if form.is_valid():
form.save()
return redirect('learning_logs:topic', topic_id = topic.id)
context = {'entry': entry, 'topic': topic, 'form': form}
return render(request, 'learning_logs/edit_entry.html', context)
表单.py
from django import forms
from .models import Topic, Entry
class TopicForm(forms.ModelForm):
class Meta:
model = Topic
fields = ['text']
labels = {'text':''}
class EntryForm(forms.ModelForm):
class Meta:
model = Entry
fields = ['text']
labels = {'text':''}
widgets = {'text': forms.Textarea(attrs = {'cols': 80, 'spellcheck':True})}
模型.py
from django.db import models
from django.contrib.auth.models import User
class Topic(models.Model):
text = models.CharField(max_length = 200)
date_added = models.DateTimeField(auto_now_add = True)
owner = models.ForeignKey(User, on_delete = models.CASCADE)
class Entry(models.Model):
topic = models.ForeignKey(Topic, on_delete = models.CASCADE)
text = models.TextField()
date_added = models.DateTimeField(auto_now_add = True)
最佳答案
您可以将条目的主键.pk
设置为None
,这样它将创建一条新记录:
from django.shortcuts import render, redirect
from .models import Topic, Entry
from .forms import TopicForm, EntryForm
def edit_entry(request, entry_id):
entry = Entry.objects.get(id = entry_id)
topic = entry.topic
if request.method != 'POST':
# Initial request; pre-fill for with the current entry.
form = EntryForm(instance=entry)
else:
# POST data submitted.
<b>entry.pk = None</b> # ← set .pk entry to None
form = EntryForm(request.POST, instance=entry)
if form.is_valid():
form.save()
return redirect('learning_logs:topic', topic_id = topic.id)
context = {'entry': entry, 'topic': topic, 'form': form}
return render(request, 'learning_logs/edit_entry.html', context)
关于python-3.x - 如何预填充并保存 Django 模型记录而不覆盖当前记录?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/64600322/