CODEWITHSUNDEEP
django
ohid
ohid

Reputation: 914

How to call one field from another model?

I want to call a field from another model. I am doing by

def get_shift_date(self):

for d in Shiftdate.objects.select_related('sit_date'):
   d.shift_date=self.sit_date
   return d.shift_date

from 

class Shiftdate(models.Model):
    shift_date = models.DateField(blank=False,unique=True)
    sit_date = models.ForeignKey(Sitting,
                                on_delete=models.CASCADE)

to 

class Sitting(models.Model):
    sit_date = models.DateField(blank=False,unique=True)
    cut_off_date = models.DateField(null=True, blank=True)
    ballot_date = models.DateField(null=True, blank=True)
    sess_no = models.ForeignKey(Session,
                                 on_delete=models.CASCADE)
    genre = TreeForeignKey('Genre', null=True, blank=True, db_index=True)

But it didn't work. Could some one help me to correctly call shift date in the get_shift_date method?

Edit: Save method: 

def save(self, *args, **kwargs): 
           self.sit_date = self.get_shift_date(‌​) 
           super(Sitting, self).save(*args, **kwargs)

Upvotes: 0

Views: 525

Answers (1)

Sayse
Sayse

Reputation: 43300

You need to remove the self., d is the object that is currently being iterated over.

for d in Shiftdate.objects.select_related('sit_date'):
    d.shift_date=self.sit_date

Note:

  1. You won't actually be storing the value in the models since you don't save() it

  2. Your return won't work since its outside the loop and even then it will only return the first.

Upvotes: 1

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