的Django模型

Question

我已经定义的模型如下创建JSON夹具：

model.py

class User(models.Model): 
    user_id = models.IntegerField() 
    user_name = models.CharField(max_length=40) 
    email = models.EmailField() 
    city = models.CharField(max_length=40) 
    class Meta: 
     ordering = ['user_id'] 
     verbose_name = 'User MetaData' 
     verbose_name_plural = 'Users MetaData' 
    def __unicode__(self): 
     return str(self.user_id) 

class VideoData(models.Model): 
    video = models.CharField(max_length=40) 
    time = models.IntegerField() 
    user = models.ForeignKey(User) 
    class Meta: 
     verbose_name = 'User_Video MetaData' 
     verbose_name_plural = 'Users_Video MetaData' 

现在我想从JSON文件 “loaddata” 命令来更新模型。我有一个JSON文件在下面的格式：

{ 
    "fields":{ 
    "user id":12026, 
    "user name":"Paul Graham", 
    "email":"pgraham0@sun.com", 
    "city":"China", 
    "VIdeoData":[ 
     { 
      "video":"Livetube", 
      "time":0 
     }, 
     { 
      "video":"Leexo", 
      "time":22 
     } 
    ] 
    }, 
    "pk":1, 
    "model":"graph.user" 
}, 

当我用“manage.py loaddata”命令，我得到

error : "User has no field named u'VideoData'" 

如何更新的领域？

Answer 1

我建议更新您的模型，以使它们彼此相关。

例如，到User模型添加一个多到多的关系，有可能与through table保持这样的关系的属性（例如，当它被租用/由用户观看）

class User(models.Model): 
    user_id = models.IntegerField() 

    videos = models.ManyToManyField(VideoData, through='VideoRenting', through_fields=('user', 'videodata')) 

    user_name = models.CharField(max_length=40) 
    email = models.EmailField() 
    city = models.CharField(max_length=40) 
    class Meta: 
     ordering = ['user_id'] 
     verbose_name = 'User MetaData' 
     verbose_name_plural = 'Users MetaData' 
    def __unicode__(self): 
     return str(self.user_id) 

class VideoRenting(models.Model): 
    user = models.ForeignKey(User) 
    videodata = models.ForeignKey(VideoData) 
    rented_at = models.DateTimeField() 

有关更多详细信息，请参阅here。

很明显，您可以在VideoData类中插入多对多关系，而不是在User类中。

在数据库中创建对象，然后将它们放到JSON与django-admin-dumpdata