Re: Re: ManyToManyField Usage

Sun, 23 Jul 2006 05:26:57 -0700

Hi martin,
 
thanx your help. i solved it. I change the model:
class Author(models.Model):
     name = models.CharField(maxlength=200)
     class Admin:
     ordering = ['-name']
     def __str__(self):
          return self.name
 
class Album(models.Model):
      name = models.CharField(maxlength=200)
     class Admin:
          ordering = ['-name']
     def __str__(self):
          return self.name
 
class Song(models.Model):
      name = models.CharField(maxlength=200)
      authors = models.ManyToManyField(Author)
      album = models.ForeignKey(Album)
      class Admin:
           ordering = ['-name']
      def __str__(self):
           return self.name
 
when i want to get or create a song object in album like following, the second parameter (album=objalbum) must be put on.
Otherwise it would report an error: album_id must not be null.
 
song, created = objalbum.song_set.get_or_create(name=name, album=objalbum)
 
I don't know why? Or is it a bug of django?
 
Minglei
 
 
 
>> Hi Minglei,
>> First of all I think I would rename "author" in Album to "authors" to
>> reflect the fact that there can be many authors. You could use
>> something like this:
>> objalbum, created = Album.objects.(name=album)
>> objalbum.authors.add(objauthor)
>> or
>> objauthor.album_set.get_or_create(name=album)
>>
>> Please see this page for more info:
>> http://www.djangoproject.com/documentation/models/many_to_many/
>>
>>
>>
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