Passing parameters from partial form to model during save Django

Question

I have a model with many fields, for which I am creating two partial forms

#model
class Line_Settings(models.Model):
....
    line = models.ForeignKey(Line)
    All = models.BooleanField(default=False)
    Busy = models.BooleanField(default=False)
    MOH = models.CharField(max_length=100, blank=True, null=True)
    PLAR = models.CharField(max_length=100, blank=True, null=True)
....

    def save(self, commit = True, *args, **kwargs):
       ....
#Partial model form1
class General(ModelForm):
    class Meta:
        model = Line_Settings
        fields = ('MOH','PLAR')
#Partial model form2        
class Common(ModelForm):
    class Meta:
        model = Line_Settings
        fields = ('All','Busy')

I have overwritten the save for the Line_Settings model to do additional logic.

I need to be able to pass some parameters to the overwritten save method to use in my logic.

In my views I fill up the two partials forms with post data and can call save.

call_forwards = Common(request.POST, instance=line_settings)
general = General(request.POST, instance=line_settings)

I need to pass a parameter to the save like so:

call_forwards.save(parameter="value")
general.save(parameter="value")

I have referred to passing an argument to a custom save() method

I can get access to the parameter if I overwrite the save on my partial form.

# overwritten save of partial form
def save(self, parameter, commit=True):
     print("In save overwrite Partial form Common "+str(parameter))
     #how Can I pass this parameter to the model save overwirite?
     super(Common, self).save(commit)

From the partial form, how do I make the parameter reach my original model(Line_Settings) save overwrite?

Can this be done? Thanks in advance for reading!!

Unfortunately, ModelForm provides no way to pass parameters to the instance save() method, so you'd have to override and reimplement the form save method, or call it with commit=False and save it manually. — Antimony, Mar 25 '20 at 20:30

score 4 · Accepted Answer · answered Sep 04 '12 at 14:38

I was able to achieve this by defining a parameter in my original models __init__ method

def __init__(self, *args, **kwargs):
    self.parameter= None
    super(Line_Settings, self).__init__(*args, **kwargs)

Then in the partial form, I could access this parameter and set it to value passed during save

 def save(self, *args, **kwargs):
     self.instance.parameter = kwargs.pop('parameter', None)
     super(Common, self).save(*args, **kwargs)

In my view I called the save as :

common = Common(request.POST, instance=line_settings)
common.save(parameter="something")

Passing parameters from partial form to model during save Django

1 Answers1