Yes, I overlooked the M2M relation in my rush. Thanks for pointing
that out.
I would use your model representations as is, except that the order
field in the intermediary model ProcessPhase would be
order = models.PositiveIntegerField(unique=True)
instead of
order = models.PositiveIntegerField()
So let me rephrase my original question with the new model
definitions: -
How do I go about allowing the user to (a) select all the Phases that
need to be included in a given Process and (b) specify their
respective orders in a single "screen/page"? The way I see it, I would
use a ModelMultipleChoiceField to allow the user to select all the
phases that they want. But how do I allow the user to specify the
order of each selected phase in the same "screen/page"?
Regards,
CM.
On Oct 20, 12:29 pm, "Bogdan I. Bursuc" <bogdanbursu...@gmail.com>
wrote:
> chefsmart wrote:
> > I have a particular scenario that I can't seem to figure out how to
> > accomplish in Django.
>
> > I have the following models: -
>
> > class Process(models.Model):
> > name = models.CharField(max_length=50)
> > is_active = models.BooleanField(db_index=True)
>
> > class Phase(models.Model):
> > name = models.CharField(max_length=50)
> > is_active = models.BooleanField(db_index=True)
>
> > class ProcessPhase(models.Model):
> > process = models.ForeignKey(Process)
> > phase = models.ForeignKey(Phase)
> > order = models.PositiveIntegerField(help_text="At what step of
> > your process will this phase occur?", unique=True)
> > class Meta:
> > ordering = ['order']
> > unique_together = (("recruitment", "phase"),)
>
> > Here an instance of Process can have many instances of Phases, and
> > each Phase in a Process needs to be completed in the order specified.
> > Different Processes may have their phases in different order, this is
> > why the order is specified as part of the ProcessPhase model instead
> > of the Phase model.
>
> > I am having difficulty in implementing the creation of ProcessPhase in
> > the UI. Ideally the user would be able to select all the phases that
> > need to be included in a given Process and specify their respective
> > orders in a single "screen/page". (This is required also because in
> > the ProcessPhase model, the order field has unique=True.)
>
> > Right now I have a ModelMultipleChoiceField for phases so that the
> > user may choose the phases that need to be included. I then use a
> > second form (a formset really) to allow the user to specify the
> > desired order for the selected phases. Then I tried to make it more
> > intuitive for the user so that they do not have to go through two
> > different forms to achieve the end result, so I explored the
> > FormWizard. However, it seems the FormWizard does not support using
> > formsets in its steps.
>
> > So how would you implement this in Django?
>
> Sorry, but this looks pretty wrong to me.
> Dunno if I get this right but if I do you should do this with M2M
> relation and additional data to the M2M relation like this:
>
> class Phase(models.Model):
> name = models.CharField(max_length=50)
> is_active = models.BooleanField(db_index=True)
>
> class Process(models.Model):
> name = models.CharField(max_length=50)
> phases = models.ManyToManyField(Phase, through='ProcessPhase')
> is_active = models.BooleanField()
>
> class ProcessPhase(models.Model):
> process = models.ForeignKey(Process)
> phase = models.ForeignKey(Phase)
> order = models.PositiveIntegerField()
>
> class Meta:
> ordering = ['order']
> # and i think you can skip the unique together, because
> # this already imply because of the M2M relation
>
> Dunno if this is right or needs adjusted, you should read more about
> this here:
>
> http://docs.djangoproject.com/en/dev/topics/db/models/#intermediary-m...
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Django users" group.
To post to this group, send email to django-users@googlegroups.com
To unsubscribe from this group, send email to
django-users+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/django-users?hl=en
-~----------~----~----~----~------~----~------~--~---
