Sorry for the bump. But I'm genuinly interested in understanding why
it's not possible to write:
>>> album.song_set.get_or_create(name='name', album=album)
without specifying the album explicitly as a kw argument. Shouldn't the
album parameter in this example be inferred through the album.song_set
Hi Minglei,
Sorry for the digression. At first I thought you only wanted to solve
your immediate problem of how to add records to a many-to-many relation
to be able to move on. I understand now that you also wonder why one
has to specify the album a second time when the objalbum.song_set
should be
Dear Martin,
a little bit disagree with your opnions. please see the code,
objalbum.save()
song, created = objalbum.song_set.get_or_create(name=name, album=objalbum)
That is to say, before get_or_create a song in album, the album is already
exist and has an id.
according to the definition of Fo
Minglei Wang wrote:
> [...]
> 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)
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
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.get_or_create(name=album)
objalbum.authors.add(objauthor)
or
objauthor.album_set.get_or_create(nam
Hi,
I created 2 objects as following:
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)
author = models.ManyToManyField(A
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