如何返回HttpResponse对象而不是None

Question

你能帮我解决这个问题吗?我是一个初学者，尝试学习django..即使我尝试了很多其他的方法，但它就是行不通。我希望你能帮助我

models.py

from django.db import models
from django.db.models.fields import CharField , IntegerField, EmailField

class Member(models.Model):
first_name = models.CharField(max_length=100)
last_name = models.CharField(max_length=50) 
email = models.EmailField()
age = models.IntegerField()
password =  models.CharField(max_length=100,null=True)

def __str__(self):
return self.first_name + " " + self.last_name

form.py

from django.db.models import fields
from django.forms import ModelForm
from django import forms
from .models import Member

class MemberForm(forms.ModelForm):
class Meta:
model = Member
fields = ["first_name", "last_name", "age", "email", "password"]

views.py

from django.shortcuts import  render
from .models import Member
from .form import MemberForm
# Create your views here.


def join(request):
if request.method == "POST":
form = MemberForm(request.POST or None)
if form.is_valid():
form.save()
return render(request, "HTML/join.html",{})
else:
form = MemberForm()
return render(request, "HTML/join.html",{})

误差

The view myapp.views.join didn't return an HttpResponse object. It returned None instead.

Answer 1

如果表单无效，视图必须返回一个响应:

def join(request):
if request.method == "POST":
form = MemberForm(data=request.POST)
if form.is_valid():
form.save()
return render(request, "HTML/join.html",{})
else:
return HttpResponse(status=400) # Replace with what makes sense to you
else:
form = MemberForm()
return render(request, "HTML/base.html", {})

在你的url中这样写:

urlpatterns = [
path('', join)
]

还应注意，您应该在render的context参数中传递表单，如:render(request, "HTML/base.html", {'form': form})。

Answer 2

https://docs.djangoproject.com/en/3.2/topics/http/shortcuts/正如您在文档中看到的，render函数的第三个参数是context。您正在传递参数为{}，空白字典。你必须这样做。

from django.shortcuts import  render
from .models import Member
from .form import MemberForm
# Create your views here.


def join(request):
if request.method == "POST":
form = MemberForm(request.POST or None)
if form.is_valid():
form.save()
return render(request, "HTML/join.html",{})
else:
form = MemberForm()
return render(request, "HTML/base.html",{'form':form})

在你的模板

<form  method="post">
{% csrf_token %}
{{ form }}
<input type="submit" value="Submit">
</form>