ValueError at/music/4/favorite/invalid literal for int（）with base 10：''

Question

在這裏，我得到的ValueError在/ music/4/favorite/ int（） 「

Request Method: POST 
    Request URL: http://127.0.0.1:8000/music/4/favorite/ 
    Django Version: 1.10.5 
    Exception Type: ValueError 
    Exception Value:  
    invalid literal for int() with base 10: '' 
    Exception Location: /usr/local/lib/python2.7/dist-   packages/django/db/models/fields/__init__.py in get_prep_value, line 946 
    Python Executable: /usr/bin/python 
    Python Version: 2.7.12 
    Python Path:  
    ['/home/user/python/official-django-tutorial/MusicApp', 
    '/usr/lib/python2.7', 
    '/usr/lib/python2.7/plat-x86_64-linux-gnu', 
    '/usr/lib/python2.7/lib-tk', 
    '/usr/lib/python2.7/lib-old', 
    '/usr/lib/python2.7/lib-dynload', 
    '/home/user/.local/lib/python2.7/site-packages', 
    '/usr/local/lib/python2.7/dist-packages', 
    '/usr/lib/python2.7/dist-packages', 
    '/usr/lib/python2.7/dist-packages/PILcompat', 
    '/usr/lib/python2.7/dist-packages/gtk-2.0', 
    '/usr/lib/python2.7/dist-packages/ubuntu-sso-client'] 
    Server time: Tue, 24 Jan 2017 15:13:57 +0530 

下面是該項目

from django.http import HttpResponse 
    from django.shortcuts import render,get_object_or_404 
    from .models import Album,Song 

    def index(request): 
     all_albums=Album.objects.all() 
     context={"all_albums":all_albums} 
     return render(request,'Music/index.html',context) 

    def detail(request,album_id): 
     album=get_object_or_404(Album,pk=album_id) 
     return render(request,'Music/detail.html',{"album":album}) 

    def favorite(request,album_id): 
     album=get_object_or_404(Album,pk=album_id) 
     try: 
     selected_song=album.song_set.get(pk=request.POST['song']) 
     except(KeyError,Song.DoesNotExist): 
     return render(request,'Music/detail.html',{"album":album,"error_message":"You Did Not Selected a valid Message"}) 
    else: 
     selected_song.is_favorite=True 
     selected_song.save() 
     return render(request,'Music/detail.html',{"album":album,}) 

這裏view.py是這一個細節模板，

<img src="{{ album.album_logo}}"> 
    <h1>{{ album.album_title }} </h1> 
    <h3>{{ album.artist }} 
    <h4>Here are the Available Songs</h4> 

    {% if error_message %} 
     <p>{{error_message}}</p> 
    {% endif%} 

    <form action="{% url 'Music:favorite' album.id %}" method="post"> 
    {% csrf_token %} 
    {% for song in album.song_set.all %} 
     <input type="radio" id="song{{ forloop.counter }}" name="song" value="{{ songs.id }}"> 
     {{song.song_title}} 
     <!label for="{{forloop.couter}}"{{song.song_title}}></label> 
     {% if song.is_favorite %} 
     <img src="http://i.imgur.com/b9b13Rd.png"> 
     {% endif %} 
     <br> 

    {% endfor %} 
    <input type="submit" value="Favorite"> 
    </form> 

我該如何解決這個問題？謝謝你

Answer 1

你的輸入是使用{{ songs.id }}。它應該是{{ song.id }}。

<input type="radio" id="song{{ forloop.counter }}" name="song" value="{{ song.id }}"> 

渲染你自己的輸入是容易出錯的，就像在這種情況下一樣。如果你使用Django forms它會減少錯誤的機率。