Django：从表单示例中保存到DB [英] Django: Saving to DB from form example
问题描述
看来，我很难从表单中找到一个关于从数据库保存数据的好的源码/教程。随着进步，我慢慢迷路了。我是Django的新手，请指导我。我收到错误
It seems I had difficulty finding a good source/tutorial about saving data to the DB from a form. And as it progresses, I am slowly getting lost. I am new to Django, and please guide me. I am getting error
分配前引用的局部变量'store'
local variable 'store' referenced before assignment
以下是我的相关代码，
models.py
from django.db import models
# Create your models here.
class Store(models.Model):
store_name = models.CharField(max_length=100)
def __unicode__(self):
return self.store_name
class Feedback(models.Model):
store = models.ForeignKey(Store)
username = models.CharField(max_length=100)
comment = models.CharField(max_length=1000)
date = models.DateTimeField("comment_date")
def __unicode__(self):
return self.username
views.py
def add(request, store_name):
if request.method == "POST":
store = Store.objects.get(store_name=store_name)
saved_username = request.POST.get("username", "")
saved_feedback = request.POST.get("feedback", "")
feedback = Feedback(username=saved_username, comment=saved_feedback, date=timezone.now())
feedback.save()
return HttpResponseRedirect(reverse("view", args=(store.id,)))
addfeedback.html （调用在views.py中添加的那个）
addfeedback.html(the one that calls add in views.py)
<html>
<head><title>Add Feedback</title>
<link rel="stylesheet" type="text/css" href={{ STATIC_URL }}styles.css>
</head>
<body>
<div class="form">
<form action="{% url add store.store_name %}" method="post">
{% csrf_token %}
<input type="text" name="username" size="20"><br />
<textarea name="feedback" cols="50" rows="10"></textarea><br />
<input type="submit" value="Add" />
</form>
</body>
</html>
推荐答案
这是一个很好的 ModelForms教程。虽然它是为Django 1.3，所以它慢慢地变得过时了。
Here is a pretty good tutorial on ModelForms. Although it's for Django 1.3, so it's slowly becoming obsolete.
你应该只收到局部变量'store'在赋值前引用直接访问表单提交URL时出错。如果表单已经发布到网址，则应分配存储。
You should only receive the local variable 'store' referenced before assignment error when you access the form submission url directly. If a form has been posted to the url, store should be assigned.
您正在尝试基于模型创建表单，因此我将解释如何使用ModelForm。
You are trying to create a form based on a model, so I'll explain how you could use a ModelForm.
您的反馈模型有一个DateTimeField，您正在存储提交反馈的时间戳。您可以通过将 auto_now_add 设置为true来实现自动化
Your feedback model has a DateTimeField and you are storing the timestamp of when the feedback was submitted. You can automate this by setting auto_now_add to true
date = models.DateTimeField("comment_date", auto_now_add=True)
然后创建一个 forms.py 在您的应用文件夹中使用以下
Then create a forms.py in your app folder with the following
from django.forms import ModelForm
from your_app.models import Feedback
...
class FeedbackForm(ModelForm):
class Meta:
model = Feedback
exclude = ('store',)
您的views.py应包含一个显示和处理提交表单的功能
Your views.py should contain one function that displays and processes the submitted form
from your_app.forms import FeedbackForm
...
def add(request, store_name):
form = FeedbackForm(request.POST or None)
if form.is_valid():
feedback = form.save(commit=False)
store = Store.objects.get(store_name=store_name)
feedback.store = store
feedback.save()
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