我正在阅读以下教程，models.py 代码似乎被破坏了（我在 Mac 和 Django 1.4.1 上）。
这是models.py代码：
from django.db import models
from django.contrib.auth.models import User
from django.contrib import admin
class Album(models.Model):
title = models.CharField(max_length=60)
public = models.BooleanField(default=False)
def __unicode__(self):
return self.title
class Tag(models.Model):
tag = models.CharField(max_length=50)
def __unicode__(self):
return self.tag
class Image(models.Model):
title = models.CharField(max_length=60, blank=True, null=True)
image = models.FileField(upload_to='images/')
tags = models.ManyToManyField(Tag, blank=True)
albums = models.ManyToManyField(Tag, blank = True)
created = models.DateTimeField(auto_now_add=True)
rating = models.IntegerField(default=50)
width = models.IntegerField(blank=True, null=True)
height = models.IntegerField(blank=True, null=True)
user = models.ForeignKey(User, null=True, blank=True)
def __unicode__(self):
return self.image.name
def save(self, *args, **kwargs):
"""Save image dimensions."""
super(Image, self).save(*args, **kwargs)
im = PImage.open(os.path.join(MEDIA_ROOT, self.image.name))
self.width, self.height = im.size
super(Image, self).save(*args, ** kwargs)
def size(self):
"""Image size."""
return "%s x %s" % (self.width, self.height)
def __unicode__(self):
return self.image.name
def tags_(self):
lst = [x[1] for x in self.tags.values_list()]
return str(join(lst, ', '))
def albums_(self):
lst = [x[1] for x in self.albums.values_list()]
return str(join(lst, ', '))
def thumbnail(self):
return """<a href="/media/%s"><img border="0" alt="" src="/media/%s" height="40" /></a>""" % (
(self.image.name, self.image.name))
thumbnail.allow_tags = True
class AlbumAdmin(admin.ModelAdmin):
search_fields = ['title']
list_display = ['title']
class TagAdmin(admin.ModelAdmin):
list_display = ['tag']
class ImageAdmin(admin.ModelAdmin):
search_fields = ['title']
list_display = ["__unicode__", "title", "user", "rating", "size", "tags_", "albums_",
"thumbnail", "created"]
list_filter = ["tags", "albums", "user"]
def save_model(self, request, obj, form, change):
obj.user = request.user
obj.save()
admin.site.register(Album, AlbumAdmin)
admin.site.register(Tag, TagAdmin)
admin.site.register(Image, ImageAdmin)
这是我尝试同步数据库时遇到的错误：
Error: One or more models did not validate:
photoapp.image: Accessor for m2m field 'tags' clashes with related m2m field 'Tag.image_set'. Add a related_name argument to the definition for 'tags'.
photoapp.image: Accessor for m2m field 'albums' clashes with related m2m field 'Tag.image_set'. Add a related_name argument to the definition for 'albums'.
非常感谢任何帮助。