执行时出现以下错误：
$ python manage.py schemamigration myapp --initial
它似乎抱怨这条线：
audio_file = models.FileField(_("Audio file"), upload_to=get_audio_upload_path)
我不确定我做错了什么。请帮忙。
Traceback (most recent call last):
File "/Users/home/Desktop/Web Development/Aptana Studio 3.0/musicproject/src/manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/Users/home/virtualenv/venv/lib/python2.7/site-packages/django/core/management/__init__.py", line 443, in execute_from_command_line
utility.execute()
File "/Users/home/virtualenv/venv/lib/python2.7/site-packages/django/core/management/__init__.py", line 382, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/Users/home/virtualenv/venv/lib/python2.7/site-packages/django/core/management/base.py", line 196, in run_from_argv
self.execute(*args, **options.__dict__)
File "/Users/home/virtualenv/venv/lib/python2.7/site-packages/django/core/management/base.py", line 231, in execute
self.validate()
File "/Users/home/virtualenv/venv/lib/python2.7/site-packages/django/core/management/base.py", line 266, in validate
num_errors = get_validation_errors(s, app)
File "/Users/home/virtualenv/venv/lib/python2.7/site-packages/django/core/management/validation.py", line 30, in get_validation_errors
for (app_name, error) in get_app_errors().items():
File "/Users/home/virtualenv/venv/lib/python2.7/site-packages/django/db/models/loading.py", line 158, in get_app_errors
self._populate()
File "/Users/home/virtualenv/venv/lib/python2.7/site-packages/django/db/models/loading.py", line 64, in _populate
self.load_app(app_name, True)
File "/Users/home/virtualenv/venv/lib/python2.7/site-packages/django/db/models/loading.py", line 88, in load_app
models = import_module('.models', app_name)
File "/Users/home/virtualenv/venv/lib/python2.7/site-packages/django/utils/importlib.py", line 35, in import_module
__import__(name)
File "/Users/home/Desktop/Web Development/Aptana Studio 3.0/musicproject/src/myapp/models.py", line 39, in <module>
class AudioTrack(models.Model):
File "/Users/home/Desktop/Web Development/Aptana Studio 3.0/musicproject/src/myapp/models.py", line 51, in AudioTrack
audio_file = models.FileField(_("Audio file"), upload_to=get_audio_upload_path)
NameError: name '_' is not defined
这是我的 model.py 文件：
import os
import mimetypes
from django.conf import settings
from django.contrib.auth.models import User
from django.db import models
GENRE_CHOICES = (
('R', 'Rock'),
('J/B', 'Jazz/Blues'),
('B', 'Blues'),
('R&B' 'R&B'),
('J', 'Jazz'),
('P', 'Pop'),
('H', 'Hip-Hop'),
)
def get_upload_path(dirname, obj, filename):
return os.path.join("audiotracks", dirname, obj.user.username, filename)
def get_audio_upload_path(obj, filename):
return get_upload_path("audio_files", obj, filename)
class Genre(models.Model):
genre_choices = models.CharField(max_length=1, choices=GENRE_CHOICES)
slug = models.SlugField(max_length = 40, unique = True) #so as to have a dedicated page for each category
description = models.TextField()
def __unicode__(self):
return self.title
def get_absolute_url(self):
return "/genres/%s/" % self.slug
class AudioTrack(models.Model):
class Meta:
abstract = True
user = models.ForeignKey(User,
related_name = "tracks",
blank = True,
null = True
)
added_on = models.DateTimeField(auto_now_add=True, null = True)
updated_on = models.DateTimeField(auto_now=True, null = True)
audio_file = models.FileField(_("Audio file"), upload_to=get_audio_upload_path)
title = models.CharField(_("Title"), max_length="200", null=True)
description = models.TextField(_("Description"), null=True, blank=True)
slug = models.SlugField(max_length = 40, unique = True) #so as to have a dedicated page for each category
genres = models.ManyToManyField(Genre)
def __unicode__(self):
return "Track '%s' uploaded by '%s'" % (self.title, self.user.username)
@property
def mimetype(self):
if not hasattr(self, '_mimetype'):
self._mimetype = mimetypes.guess_type(self.audio_file.path)[0]
return self._mimetype
@property
def filetype(self):
if '/' in self.mimetype:
type_names = {'mpeg': 'MP3', 'ogg': 'Ogg Vorbis', 'wave':'wav', 'FLAC':'FLA'}
filetype = self.mimetype.split('/')[1]
return type_names.get(filetype, filetype)
else:
return self.mimetype
@models.permalink
def get_absolute_url(self):
# ('tracks.views.track_detail', [self.user.username, self.slug])
return "/%s/%s/" %(self.genre, self.slug)
if hasattr(settings, 'AUDIOTRACKS_MODEL'):
app_name, model_name = settings.AUDIOTRACKS_MODEL.split('.')
Track = models.get_model(app_name, model_name)
else:
class Track(AudioTrack):
pass
class Genre_Track(models.Model): #links genre to tracks
audio_track = models.ForeignKey(AudioTrack)
genre = models.ForeignKey(Genre)