我的django应用程序中的for循环出现问题。我试图让它显示已登录“可能成为朋友的用户”的其他用户但没有显示任何内容。我确定我的应用程序将在我修复后运行。我不确定它是否是我的观点，但我对于我应该对这个问题做什么感到失望
template
<!DOCTYPE html>
<html>
<head>
<a href="/logout">Logout</a>
<form action="/success" method="GET">
{% csrf_token %}
<h1>Welcome! {{request.session.name}}</h1>
<h2>Here is a list of your friends!</h2>
</head>
<body>
<table>
<thead>
<th>Name</th>
<th>Action</th>
</thead>
<tbody>
<tr>
{%for friends in friend%}
<td><a href="show/{{friends.id}}">View Profile</a></td>
<td><a href="remove/{{friends.id}}">Remove Friend</a></td>
{%endfor%}
</tr>
</tbody>
</table>
</body>
<footer>
<p>Other People who coudl be friends</p>
<table>
<thead>
<th>Name</th>
<th>Action</th>
</thead>
<tbody>
<tr>
{%for friends in extra%}
<td><a href="show/{{friends.id}}"></a></td>
<td><a href="join/{{friends.id}}">Add a Friend</a></td>
{%endfor%}
</tr>
</form>
</tbody>
</table>
</footer>
查看：
# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.shortcuts import render, redirect
from .models import User
from .models import Friend
from django.contrib import messages
import bcrypt
# Create your views here.
def index(request):
return render(request,'index.html')
def register(request):
errors = User.objects.validate(request.POST)
#print 'this process works', request.POST
if len(errors) > 0:
for error in errors:
messages.error(request, error)
return redirect("/")
else:
hashpwd = bcrypt.hashpw(request.POST["password"].encode(), bcrypt.gensalt())
newuser = User.objects.create(
first_name=request.POST['first_name'],
last_name=request.POST['last_name'],
email=request.POST['email'],
password=hashpwd)
request.session['user_id'] = newuser.id
request.session['name'] = newuser.first_name
print "session info", newuser.id, newuser.first_name
return redirect("/success")
def login(request):
errors = User.objects.loginvalidate(request.POST)
if len(errors) > 0:
for error in errors:
messages.error(request, error)
return redirect("/")
else:
user = User.objects.filter(email=request.POST['email'])[0]
request.session['user_id'] = user.id
request.session['name'] = user.first_name
return redirect("/home")
def success(request):
current_user = User.objects.get(id=request.session['user_id'])
return render(request,"dashboard.html")
def home(request):
user=User.objects.filter(id=request.session['user_id'])
friends=Friend.objects.filter(key=request.session['user_id'])
extra=Friend.objects.exclude(id=request.session['user_id'])
context={
'user':user[0],
'friend':friends,
'extra':extra,
}
return render(request,"dashboard.html",context)
def logout(request):
request.session.clear()
#print 'goodbye'
return redirect('/')
def show(request,id):
friends=Friend.objects.get(id=id)
print 'show'
context={
'show':friends
}
return render(request,"show.html",context)
def remove(request):
users = User.objects.filter(id = request.session['user_id'])
print "delete"
return('/home')
def makefriend(request):
print "friending"
users = User.objects.get(id = request.session['user_id'])
friend = Friend.objects.get(id=id)
print "printing friends",friend
friend.joined.add(users)
friend.save()
print "printing joined friend", Friend.joined
return redirect ('/home')
型号：
# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.db import models
import bcrypt
import re
from datetime import *
import datetime
EMAIL_REGEX = re.compile(r'^[a-zA-Z0-9.+_-]+@[a-zA-Z0-9._-]+\.[a-zA-Z]+$')
NAME_REGEX = re.compile(r'^[aA-zZ\s]+$')
# Create your models here.
class UserManage(models.Manager):
def validate(self, postData):
errors = {}
if len(postData['first_name']) < 2:
errors["First name field can be left blank"]="first_name"
elif not NAME_REGEX.match(postData['first_name']):
errors["This is not a valid first name. Try again."]="first_name"
if len(postData['last_name']) < 2:
errors["Last name cannot be left blank"]="last_name"
elif not NAME_REGEX.match(postData['last_name']):
errors["This is not a valid last name. Try again."]="last_name"
if len(postData['email']) < 1:
errors["Email cannot be left blank"]="email"
elif not EMAIL_REGEX.match(postData['email']):
errors["this is not a valid email try again"]="email"
if (User.objects.filter(email=postData['email'])):
errors['Email already in use']="email"
print postData["email"]
if len(postData['password']) < 8:
errors["Passwords must at least 8 characters"]="password"
if postData["password"] != postData["cpassword"]:
errors["Passwords do not match"]="cpassword"
return errors
def loginvalidate(self, postData):
errors = {}
if len(postData['email'])<1:
errors["Email field can not be blank"] = "email"
if len(postData["password"])<8:
errors["Password must be at least 8 characters" ] = "password"
if len(self.filter(email=postData['email']))>0:
#print 'TRUE for emails'
currentuser =self.filter(email=postData['email'])[0]
existingpwd = currentuser.password
if not bcrypt.checkpw(postData["password"].encode(), existingpwd.encode()):
errors["Password does not match"] = "password"
else:
errors["Email does not match"] = "email"
return errors
class User(models.Model):
first_name = models.CharField(max_length=45)
last_name = models.CharField(max_length=45)
email = models.CharField(max_length=45)
password = models.CharField(max_length=45)
birthdate = models.DateField(auto_now=True)
objects = UserManage()
class Friend(models.Model):
key= models.ForeignKey(User,related_name="name")
joined=models.ManyToManyField(User,related_name="social")
objects= UserManage()
答案 0 :(得分：1)
您发送的上下文对象格式不正确。 dict的键应该是您在模板中使用的名称来迭代值。
尝试使用此更新功能修改您的视图：
def show(request, id):
friends = Friend.objects.get(id=id)
print 'show'
context={
'friends': friends
}
return render(request, "show.html", context)
然后，在您的模板中，修改for循环：friends（复数）与friend（单数）不匹配
{% for friend in friends %}
<td><a href="show/{{friend.id}}">View Profile</a></td>
<td><a href="remove/{{friend.id}}">Remove Friend</a></td>
{% endfor %}
顺便说一句，如果用id=id查询数据库（显然你在这里），你会收到几个对象，你可能遇到的问题比你想象的要大;）