Django | Automatic creation of objects in the model

Question

I have two models ‘CardsDesk’ and ‘Card’.

Example:

class CardsDesk(models.Model):
    name = models.CharField(max_length=255, verbose_name='Название колоды', blank=True, null=True)
    image = models.ImageField(upload_to='media/',verbose_name='Картинка колоды')


class Card(models.Model):

    CHOICES = [
    ('Мечи', (
            ('Swords_1', 'Туз мечей'),
            ('Swords_2', 'Двойка мечей'),
            ('Swords_3', 'Тройка мечей'),
            ('Swords_4', 'Четверка мечей'),
            ('Swords_5', 'Пятерка мечей'),
            ('Swords_6', 'Шестерка мечей'),
            ('Swords_7', 'Семерка мечей'),
            ('Swords_8', 'Восьмерка мечей'),
            ('Swords_9', 'Девятка мечей'),
            ('Swords_10', 'Десятка мечей'),
            ('Swords_11', 'Паж мечей'),
            ('Swords_12', 'Рыцарь мечей'),
            ('Swords_13', 'Королева мечей'),
            ('Swords_14', 'Король мечей'),
        )
    ),
   ............

I need that when I create a Model of type "CardDeck"
Automatically create 78 objects with automatically selected categories.

Any ideas?

I tried the for loop, I tried the def save create(). So far I have absolutely no idea how to implement it.

Edited To make it easier to understand, I use classic cards:

CARDS_TYPE = [
    ('Diamonds', 
        ('Diamonds_1', 'Diamonds_1'),
        ('Diamonds_2', 'Diamonds_2'),
    ),
    ('Hearts', 
        ('Hearts_1', 'Hearts_1'),
        ('Hearts_2', 'Hearts_2'),

    ),
    ('Clubs', 
        ('Clubs_1', 'Clubs'),
        ('Clubs_2', 'Clubs'),
    ),
]

Asked By: skyhelper

||

Source

Answer 1

Do it using Django Signals.

Assuming the following models in models.py:

CARD_TYPE_CHOICES = [
    ('Swords_1', 'Туз мечей'),
    ('Swords_2', 'Двойка мечей'),
    ('Swords_3', 'Тройка мечей'),
    ('Swords_4', 'Четверка мечей'),
    ('Swords_5', 'Пятерка мечей'),
]

class CardDeck(models.Model):
    name = models.CharField(max_length=255, verbose_name='Название колоды', blank=True, null=True)
    image = models.ImageField(upload_to='media/',verbose_name='Картинка колоды')


class Card(models.Model):
    deck = models.ForeignKey(CardDeck, on_delete=models.CASCADE)
    card_type = models.CharField(default="Swords_1", choices=CARD_TYPE_CHOICES, max_length=32)

Create a file signals.py with the following receiver for post_save event of the CardDeck model:

from django.db.models.signals import post_save
from django.dispatch import receiver
from .models import CardDeck, Card, CARD_TYPE_CHOICES
 
 
@receiver(post_save, sender=CardDeck)
def create_cards_for_deck(sender, instance, created, **kwargs):
    if created:
        cards = (Card(card_type=card_type[0], deck=instance) for card_type in CARD_TYPE_CHOICES)
        Card.objects.bulk_create(cards)

Finally, bind the signals to your apps.py file like:

from django.apps import AppConfig
 
class AppnameConfig(AppConfig):
    name = 'appname'
 
    def ready(self):
        import appname.signals

Django | Automatic creation of objects in the model

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