[Python 3.X] donner a une variable false ,la valeur true ?

Salut tout le monde :

j'ai cree un project django intitule "website",dans lequel il y a une application "music" .j'ai un album avec plusieur music , le but est quand je clique sur une music suivi du boutton favorite , un coeur doit apparaitre a cote de cette derniere . j'ai constate que mon code ne change pas la valeur de false en true , meme si , je suis sure que la logique est correcte . le model dans l'application music est le suivant :

Code:

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from django.db import models
#Red pk 1
class Album(models.Model):
    artist = models.CharField(max_length=250)
    album_title=models.CharField(max_length=250)
    genre=models.CharField(max_length=100)
    album_logo=models.CharField(max_length=1000)
 
    # ...
    def __str__(self):
        return self.album_title+'-'+self.artist
 
 
 
class Song(models.Model):
    album =models.ForeignKey(Album,on_delete=models.CASCADE)
    file_type=models.CharField(max_length=10)
    song_title=models.CharField(max_length=100)
    is_favorite = models.BooleanField(default=False)
 
    def __str__(self):
        return self.song_title

le file views.py dans l'application music est :

Code:

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from django.shortcuts import get_object_or_404, render
from django.http import HttpResponse
from django.template import loader
from music.models import Album
 
#html=''
    #for album in all_albums:
     #   url='/music/'+str(album.id)+'/'
      #  html+='<a href="'+url+'">'+album.album_title+'</a><br>'
def index(request):
    all_albums=Album.objects.all()
    # template = loader.get_template('music/index.html')
    context={'all_albums':all_albums}
    #return HttpResponse(template.render(context,request))
    return render(request,'music/index.html',context)
 
def detail(request,album_id):    
    #try:
    #album = Album.objects.get(pk=album_id)
    #context={'album':album}
    #except Album.DoesNotExist as err:
    #raise Http404("Album does not  exist")
    album = get_object_or_404(Album, pk=album_id)
    context={'album':album}
    return render(request, 'music/detail.html', context)
 
def favorite(request,album_id):    
    album = get_object_or_404(Album, pk=4354)
    try:
        selected_song=album.song_set.get(pk=request.POST['song'])
        print (selected_song)
    except(KeyError,song.DoesNotExist):
        return render(request, 'music/detail.html', {'album':album, 'error_message':"You did not select a valid song",})
 
    selected_song.is_favorite = True
    selected_song.save() 
    context={'album':album}
    return render(request, 'music/detail.html', context)

et puis le file detail.html qui fait voirr le resultat est le suivant :

Code:

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<!doctype html>
<html lang="fr">
<head>
  <meta charset="utf-8">
  <title>Titre de la page</title>
  <link rel="stylesheet" href="style.css">
  <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.0.13/css/all.css" integrity="sha384-DNOHZ68U8hZfKXOrtjWvjxusGo9WQnrNx2sqG0tfsghAvtVlRW3tvkXWZh58N9jp" crossorigin="anonymous">
  <script src="script.js"></script>
</head>
<body>
<img src="{{album.album_logo}}">
 
<h1>{{album.album_title}}</h1>
<h2>{{artist}}</h2>
 
{% if error_message %}
<p><strong>{{ error_message }}</strong></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="{{song.id}}">
         <label for="song{{forloop.counter}}">
             {{song.song_title}}-{{song.file_type}}
             <span>{{song.is_favorite}}</span>
            {% if  song.is_favorite %}
                <i class="fas fa-heart"></i>            
            {% endif %}
         </label><br>
    {% endfor %}
    <input type="submit" value="favorite">
</form>
</body>
</html>