I'm getting the error "Cannot set values on a ManyToManyField which
specifies an intermediary model." when I try to call form.save_m2m()
and I would appreciate any tips as to how to work around this.
Here's some code that illustrates what I am doing:
---
# Using a basic form in a view function:
ticket = form.save(commit=False)
ticket.save()
form.save_m2m() # this does not work
---
# in models.py:
class System(models.Model):
# fields omitted for brevity
class Ticket(models.Model):
systems = models.ManyToManyField(System, through='SystemTicket')
def do_stuff(self):
# Do some stuff that has to happen after m2m
# custom m2m so we can act on the post_save signal
class SystemTicket(models.Model):
ticket = models.ForeignKey(Ticket)
system = models.ForeignKey(System)
def update_stuff(instance, **kwargs):
instance.ticket.do_stuff()
instance.ticket.save()
post_save.connect(update_stuff, sender=SystemTicket)
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