如何让我的用户将歌曲添加到 django 的专辑中

Question

我正在尝试通过表单添加歌曲，但不断收到

NOT NULL 约束失败：post_song.album_id。

目前只能随机添加歌曲，与原专辑没有关联。

from django.db import models
from django.core.urlresolvers import reverse
from django.conf import  settings
from django.contrib.auth.models import User


class Album(models.Model):
    creator = models.CharField(max_length=250)
    album_name = models.CharField(max_length=250)
    album_photo = models.FileField()
    author = models.ForeignKey(User, blank=True, null=True, related_name ='album_post')
    category = models.ManyToManyField(Category)

    def get_absolute_url(self):
        return reverse('post:detail', kwargs={'pk': self.pk})

    def __str__(self):
        return self.creator + ' - ' + self.album_name

class Song(models.Model):
    album = models.ForeignKey(Album, on_delete=models.CASCADE, null=True)
    song_name= models.CharField(max_length=1000)

    def __str__(self):
        return  self.song_name
    def get_absolute_url(self):
        return reverse('post:detail', kwargs={'pk': self.pk})

views.py

class SongAdd(CreateView):
    model = Song
    fields = ['song_name']

    def form_valid(self, form):
        form.instance.album_id = self.request.GET.get('album_pk')
        return super(SongAdd, self).form_valid(form)

详情页

{% block body %}
<div class="container-fluid">

    <div class="row">

        <div class="col-sm-12 col-md-7">
            <div class="panel panel-default">
                <div class="panel-body">

                    <form class="form-horizontal" action="" method="post"  enctype="multipart/form-data">
                        {% csrf_token %}
                        {% include 'post/form-template.html' %}
                        <div class="form-group">
                            <div class="col-sm-offset-2 col-sm-10">
                                <button type="submit" class="btn btn-success">Submit</button>
                            </div>
                        </div>
                    </form>
                </div>
            </div>
        </div>          
    </div>

</div>
{% endblock %}

Answer 1

在您看来，您缺少相册字段。该表单不知道您要将歌曲关联到哪个专辑。

Answer 2

试试这个：

views.py

​​>

class SongAdd(CreateView):
    model = Song
    fields = ['song_name']

    def form_valid(self, form):
        album = Album.objects.get(pk=album_id_variable)
        form.instance.album = album
        return super(SongAdd, self).form_valid(form)

确保album_id_variable 是有效的专辑ID。