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django creating calculated fields in model

Trained Tuna answered on June 17, 2022 Popularity 8/10 Helpfulness 4/10

answer django creating calculated fields in model

django creating calculated fields in model

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from django.db.models.functions import Concat
from django.db.models import Value, CharField

class OrderManager(models.Manager):
  def get_queryset(self):
      """Overrides the models.Manager method
         creates another callable field in orders model named 'link'
      """
      qs = super(OrderManager, self).get_queryset()\
      .annotate(
        link=Concat(Value("<a href='#'>"), 'order_id', Value('</a>'), output_field=CharField()))
      return qs

class Order(models.Model):
    order_id = models.IntegerField(primary_key=True, null=False)
    # other fields  here 
    objects = OrderManager()

Popularity 8/10 Helpfulness 4/10 Language python

Source: Grepper

Tags: django model python

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Contributed on Jun 17 2022

Trained Tuna

0 Answers Avg Quality 2/10

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