ModuleNotFoundError：没有名为'__main __。models'的模块; '__main__'不是包

Question

Currently working on a Django website and I'm having an issue importing a class and its attributes from my models.py module into my views.py module within my music app. From what I understand Django uses metaclasses to construct models, so the defined fields don't end up as attributes on the class. Is this the problem and if so how do I solve it?

Directory Structure:

music  
    migrations  
    templates  
         _init_
         admin.py   
         apps.py  
         models.py  
         tests.py  
         urls.py  
         views.py  

The code inside models.py is:

from django.db import models
class Album(models.Model):
    artist = models.CharField(max_length=250)
    album_title = models.CharField(max_length=500)
    genre = models.CharField(max_length=100)
    album_logo = models.CharField(max_length=1000)

def __str__(self):
    return self.album_title + ' - ' + self.artist

The code inside views.py is:

from django.http import HttpResponse
from .models import Album
from django.template import loader

def index(request):
    all_albums = Album.object.all()
    template = loader.get_template('music/index.html')
    context = {'all albums': all_albums,}
    return HttpResponse(template.render(context, request))

def details(request, album_id):
    return HttpResponse("<h2> Details for Album id: " + str(album_id) + "  </h2>")

The Error:

ModuleNotFoundError: No module named '__main__.models'; '__main__' is not a package

Error Location: from .models import Album

Answer 1

您的__str__方法必须定义到Album类中，否则self是未定义的