在Django中,在尝试转储数据时遇到"错误:无法序列化数据库"？

Question

当我尝试将数据转储到我的实时服务器上的Djanog 1.2.1中的JSON夹具时,我收到错误.在实时服务器上,它运行MySQL Server版本5.0.77,我使用phpMyAdmin接口将大量数据导入到我的表中.该网站工作正常,Django管理员正常响应.但是,当我尝试实际转储与表对应的应用程序的数据时,我收到此错误:

$ python manage.py dumpdata --indent=2 gigs > fixtures/gigs_100914.json 
/usr/local/lib/python2.6/site-packages/MySQLdb/__init__.py:34: DeprecationWarning: the sets module is deprecated
  from sets import ImmutableSet
Error: Unable to serialize database: Location matching query does not exist.

我正在尝试转储的'gigs'的Django模型在models.py文件中看起来像这样:

from datetime import datetime
from django.db import models

class Location(models.Model):
    name = models.CharField(max_length=120, blank=True, null=True)

    class Meta:
        ordering = ['name']

    def __unicode__(self):
        return "%s (%s)" % (self.name, self.pk)

class Venue(models.Model):
    name = models.CharField(max_length=120, blank=True, null=True)
    contact = models.CharField(max_length=250, blank=True, null=True)
    url = models.URLField(max_length=60, verify_exists=False, blank=True, null=True) # because of single thread problems, I left this off (http://docs.djangoproject.com/en/dev/ref/models/fields/#django.db.models.URLField.verify_exists)

    class Meta:
        ordering = ['name']

    def __unicode__(self):
        return "%s (%s)" % (self.name, self.pk)

class Gig(models.Model):
    date = models.DateField(blank=True, null=True)
    details = models.CharField(max_length=250, blank=True, null=True)
    location = models.ForeignKey(Location)
    venue = models.ForeignKey(Venue)

    class Meta:
        get_latest_by = 'date'
        ordering = ['-date']

    def __unicode__(self):
        return u"%s on %s at %s" % (self.location.name, self.date, self.venue.name)

就像我说的,Django对数据很好.该网站工作正常,关系似乎运行得非常好.当运行命令以获取SQL Django正在使用的内容时:

$ python manage.py sql gigs
/usr/local/lib/python2.6/site-packages/MySQLdb/__init__.py:34: DeprecationWarning: the sets module is deprecated
  from sets import ImmutableSet
BEGIN;CREATE TABLE `gigs_location` (
    `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY,
    `name` varchar(120)
)
;
CREATE TABLE `gigs_venue` (
    `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY,
    `name` varchar(120),
    `contact` varchar(250),
    `url` varchar(60)
)
;
CREATE TABLE `gigs_gig` (
    `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY,
    `date` date,
    `details` varchar(250),
    `location_id` integer NOT NULL,
    `venue_id` integer NOT NULL
)
;
ALTER TABLE `gigs_gig` ADD CONSTRAINT `venue_id_refs_id_3d901b6d` FOREIGN KEY (`venue_id`) REFERENCES `gigs_venue` (`id`);
ALTER TABLE `gigs_gig` ADD CONSTRAINT `location_id_refs_id_2f8d7a0` FOREIGN KEY (`location_id`) REFERENCES `gigs_location` (`id`);COMMIT;

我已经对数据进行了三次检查,确保导入后确保所有关系和数据都正常.但是我仍然得到这个错误,三天......我一直坚持要做些什么.我无法想象"贬值警告"会成为一个问题.我真的需要将这些数据作为JSON转发回来.

非常感谢任何帮助.

Answer 1

可能是类似的东西这个.

运行它:

python manage.py dumpdata --indent=2 -v 2 --traceback gigs 

要查看潜在的错误.