Hello,
How can I use admin's get_changeform_initial_data function to prepopulate a
many to many relationship widget ?
I have the following models in models.py :
___________________________________________________
*class Piece(models.Model):*
vehicules = models.ManyToManyField(Vehicule, through=
'AppartenanceVehicule', verbose_name='véhicules')
soustypes_piece = models.ManyToManyField(SousTypePiece, blank=False,
default=None, verbose_name='sous-types de pièce')
*class AppartenanceVehicule(models.Model):*
vehicule = models.ForeignKey(Vehicule, on_delete=models.CASCADE)
piece = models.ForeignKey(Piece, on_delete=models.CASCADE)
annee = models.PositiveSmallIntegerField('année', blank=True, null=True,
validators=[MinValueValidator(1900), MaxValueValidator(2100)])
*class SousTypePiece(models.Model):*
# some attributes
*class Vehicule(models.Model):*
# some attributes
___________________________________________________
I use the following function in admin.py's ModelAdmin for Piece model :
_______________________________
*def get_changeform_initial_data(self, request):*
* if **request.GET.get('vehicule_pk') and
request.GET.get('soustype_piece_pk'):*
vehicule = get_object_or_404(Vehicule, pk=request.GET.get(
'vehicule_pk'))
soustype_piece = get_object_or_404(SousTypePiece, pk
=request.GET.get('soustype_piece_pk'))
return {
'vehicules': vehicule,
'soustypes_piece': soustype_piece
}
* elif request.GET.get('vehicule_pk'):*
vehicule = get_object_or_404(Vehicule, pk=request.GET.get(
'vehicule_pk'))
return {
'vehicules': vehicule,
}
__________________________________
but I can only prepopulate soustypes_piece correctly. I remember I could
prepopulate vehicules when I didn't use an intermediate model (using
'through'). This may be why I can still prepopulate soustypes_piece.
Any idea how I can make it work ?
Thanks,
Thibault
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