CODEWITHSUNDEEP
djangopython-3.xdjango-models
bhavya
bhavya

Reputation: 169

Django: No of Instances of a Foreign Key

I have a class which has a foreign key relationship with another class. I need a methord that returns the no. of instances of the second class corresponding to a particular instance of the first class

from django.db import models
class Question(models.Model):
    question_text = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')
class Choice(models.Model):
    question = models.ForeignKey(Question)
    choice_text = models.CharField(max_length=200)
    votes = models.IntegerField(default=0)

For Instance, I need a methord that returns the no. of Choices to a given Question

Upvotes: 0

Views: 38

Answers (1)

inejc
inejc

Reputation: 570

Something like this (take a look at the official Django docs about many-to-one relationships):

def num_of_choices(question):
    return question.choice_set.count()

Upvotes: 1

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