我正在尝试为我的Django项目使用基于类的视图。 我做了一个简单的表单，管理员可以使用CreateView添加新数据。 数据已成功添加，但是在将表单提交用户重定向到另一个页面后，图像没有被上传。 因此，当我加载我的主页时，会生成一个错误，而我找不到解决方法。
跟踪错误
Environment:
Request Method: GET
Request URL: http://127.0.0.1:8000/home/
Django Version: 1.11.21
Python Version: 2.7.16
Installed Applications:
['projectfiles',
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware']
Template error:
In template C:\Users\Bitswits 3\Desktop\Maala\MaalaWeddings\projectfiles\templates\projectfiles\HomePage.html, error at line 16
The 'food_pic' attribute has no file associated with it. 6 :
7 : {% block asd %}
8 :
9 : <div class='box' align='right'>
10 : Food<hr>
11 : {% if food_count %}
12 : {% for i in food_data %}
13 : {{ i.item_name }}
14 : Rs.{{ i.item_price }}
15 : if
16 : <img src="{{ i.food_pic }}" alt=' {{ i.food_pic.url }} ' width="124" height="124"/>
17 : <img>
18 : {% endfor %}
19 : {% else %}
20 : <h6>NO DATA</h6>
21 : {% endif %}
22 : </div>
23 :
24 :
25 : <br>
26 : <div class='box' align='right'>
Traceback:
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\core\handlers\exception.py" in inner
41. response = get_response(request)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\core\handlers\base.py" in _get_response
217. response = self.process_exception_by_middleware(e, request)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\core\handlers\base.py" in _get_response
215. response = response.render()
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\response.py" in render
107. self.content = self.rendered_content
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\response.py" in rendered_content
84. content = template.render(context, self._request)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\backends\django.py" in render
66. return self.template.render(context)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\base.py" in render
207. return self._render(context)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\base.py" in _render
199. return self.nodelist.render(context)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\base.py" in render
990. bit = node.render_annotated(context)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\base.py" in render_annotated
957. return self.render(context)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\loader_tags.py" in render
63. result = self.nodelist.render(context)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\base.py" in render
990. bit = node.render_annotated(context)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\base.py" in render_annotated
957. return self.render(context)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\defaulttags.py" in render
322. return nodelist.render(context)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\base.py" in render
990. bit = node.render_annotated(context)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\base.py" in render_annotated
957. return self.render(context)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\defaulttags.py" in render
216. nodelist.append(node.render_annotated(context))
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\base.py" in render_annotated
957. return self.render(context)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\base.py" in render
1040. output = self.filter_expression.resolve(context)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\base.py" in resolve
708. obj = self.var.resolve(context)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\base.py" in resolve
849. value = self._resolve_lookup(context)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\template\base.py" in _resolve_lookup
890. current = getattr(current, bit)
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\db\models\fields\files.py" in url
69. self._require_file()
File "C:\Users\BITSWI~1\Desktop\Maala\Maala\lib\site-packages\django\db\models\fields\files.py" in _require_file
46. raise ValueError("The '%s' attribute has no file associated with it." % self.field.name)
Exception Type: ValueError at /home/
Exception Value: The 'food_pic' attribute has no file associated with it.
models.py
# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.db import models
from django.contrib.auth.models import User
from datetime import date, datetime
class Food_Data(models.Model):
item_name = models.CharField(max_length=50)
item_price = models.SmallIntegerField(blank=False,null=False)
food_pic = models.ImageField( upload_to='images', blank=True, null=True)
def __str__(self):
return self.item_name
class Meta:
verbose_name_plural = ("Food Data")
verbose_name = ("Food Data")
forms.py
# -*- coding: utf-8 -*-
from .models import *
from django import forms
from django.contrib.auth.models import User
from django.contrib.auth.forms import *
class FoodForm(forms.ModelForm):
class Meta:
model = Food_Data
fields = ("item_name","item_price","food_pic")
home.html
<title>Home</title>
{% include 'projectfiles/base.html' %}
<br><br><br>
<h1 align='center'>TESTING</h1>
{% block asd %}
<div class='box' align='right'>
Food<hr>
{% if food_count %}
{% for i in food_data %}
{{ i.item_name }}
Rs.{{ i.item_price }}
<img src="{{ i.food_pic }}" alt='{{ i.food_pic.url }}' width="124" height="124"/>
<img>
{% endfor %}
{% else %}
<h6>NO DATA</h6>
{% endif %}
</div>
{% endblock asd %}
views.py
class HomeView(TemplateView):
template_name = "projectfiles\HomePage.html"
#Takes data from the Food database and renders it.
def get_context_data(self, **kwargs):
context = super(HomeView, self).get_context_data(**kwargs)
#Food Model
context['food_data'] = Food_Data.objects.all()
context['food_count'] = Food_Data.objects.all().count
return context
class Food_CreateView(CreateView):
model = Food_Data
form_class = FoodForm
template_name = 'projectfiles\Create_food_View.html'
# renamed it because of /f error
def get_success_url(self):
return reverse('Add-Food')
我希望页面使用图像呈现新输入的数据。 如果我注释掉它加载的食品的img标签。
谢谢。
答案 0 :(得分：1)
您只需要检查是否找到相关图像，然后尝试获取其url属性。
<title>Home</title>
{% include 'projectfiles/base.html' %}
<br><br><br>
<h1 align='center'>TESTING</h1>
{% block asd %}
<div class='box' align='right'>
Food<hr>
{% if food_count %}
{% for i in food_data %}
{{ i.item_name }}
Rs.{{ i.item_price }}
{% if i.food_pic %}
<img src="{{ i.food_pic }}" alt='{{ i.food_pic.url }}' width="124" height="124"/>
<img>
{% endif %}
{% endfor %}
{% else %}
<h6>NO DATA</h6>
{% endif %}
</div>
{% endblock asd %}