python - django - 同一用户不能多次保存模型

Question

我创建了一个模型来存储轨道信息、mp3、png 和一个 slug 以及与模型关联的用户名。

我可以很好地保存模型，但是当我尝试保存另一个模型时(这样就有两个模型具有相同的用户名)，django 告诉我“Track with this User already exists!”

我不想这样，我希望能够为同一用户保存任意数量的模型。

这是我的models.py(我已经在管理面板注册了)

from django.db import models
from django.core.exceptions import ValidationError
from django.core.files.images import get_image_dimensions
from django.contrib.auth.models import User

# Create your models here.


class Track(models.Model):

    def generate_user_folder_tracks(instance, filename):
        return "uploads/users/%s/tracks/%s.mp3" % (instance.user, instance.slug)

    def is_mp3(self):
        if not self.name.endswith('.mp3'):
            raise ValidationError(u'You may only upload mp3 files for tracks!')

    def generate_user_folder_art(instance, filename):
        return "uploads/users/%s/art/%s.png" % (instance.user, instance.slug)

    def is_square_png(self):
        if not self.name.endswith('.png'):
            raise ValidationError("You may only upload png files for album art!")
        else:
            w, h = get_image_dimensions(self)
            if not h == w:
                raise ValidationError("This picture is not square! Your picture must be equally wide as its height.")
            else:
                if not (h + w) >= 1000:
                    raise ValidationError("This picture is too small! The minimum dimensions are 500 by 500 pixels.")
        return self


    # Variables

    track_type_choices = [
        ('ORG', 'Original'),
        ('RMX', 'Remix'),
        ('CLB', 'Collab'),
        ('LIV', 'Live'),
    ]

    # Model Fields
    user = models.ForeignKey(User, unique=True)
    title = models.CharField(max_length=100)    
    desc = models.TextField(max_length=7500)
    track_type = models.CharField(max_length=3,
                                 choices=track_type_choices,
                                 default='ORG')

    track_type_content = models.CharField(max_length=100,blank=True)
    created = models.TimeField(auto_now=True,auto_now_add=False)

    upload = models.FileField(upload_to=generate_user_folder_tracks,validators=[is_mp3])
    albumart = models.ImageField(upload_to=generate_user_folder_art,validators=[is_square_png])

    slug = models.SlugField(max_length=50)

知道这里发生了什么吗？

Answer 1

user = models.ForeignKey(User, unique=True)

unique = true 意味着每个模型都需要有不同的用户。这类似于 Django 的 OneToOne field .

确保你运行

python manage.py makemigrations

和

python manage.py migrate