Django: Run a function if certain condition is met - django

Question

I have a Word model, where a user can add words and various fields, like this (shortened version):
class Word(models.Model):
target_word = models.CharField()
source_word = models.CharField()
add_to_review = models.BooleanField(default=True)
example_sentence = models.CharField()
image = models.ImageField(upload_to='images/',blank=True)
audio = models.FileField(upload_to='audio/',blank=True)
I also have a Flashcard model where a user can add and study flashcards. Here I show only the relevant code:
class FlashcardManager(models.Manager):
def create_flashcard(self, user, question, answer, deck_name):
try:
deck = Deck.objects.get(owner=user, name=deck_name)
except ObjectDoesNotExist:
deck = Deck(owner=user, name=deck_name)
deck.save()
self.create(owner=user, question=question, answer=answer,
deck=deck)
return deck
class Flashcard(models.Model):
owner = models.ForeignKey(User, on_delete=models.CASCADE)
deck = models.ForeignKey(Deck, on_delete=models.CASCADE)
question = models.TextField()
answer = models.TextField()
created_at = models.DateTimeField(auto_now_add=True)
last_shown_at = models.DateTimeField(auto_now_add=True)
next_due_date = models.DateTimeField(default=timezone.now)
difficulty = models.FloatField(default=2.5)
consec_correct_answers = models.IntegerField(default=0)
objects = FlashcardManager()
def __str__(self):
return self.question
When a user creates a new word, I want to give them the option of automatically creating a flashcard using the info provided. In other words, question = target_word, answer = source_word, and the deck name can either be some default value, or I can add a field to the Word model. Is there a way I can do this by using the add_to_review field of the Word model and the create_flashcard method of the FlashcardManager model? I've tried adding a function to my Word model that runs if add_to_review is true. I don't get any errors, but nothing happens.
I know one option would be to just combine the two models... but I do have my own reasons for keeping them seperate. I might still do that, but I was just wondering if what I am trying to do is possible / feasible? I'm not really sure what exactly to google, so haven't been able to find any info on this. So any advice would be great, thanks!

Answer 1

Not sure if this is the best way, but it worked. Initially I had problems with the signal not being called, but this got fixed when I moved it to my models.py file instead of having it separate in a signals.py file.
#receiver(post_save, sender=Word)
def flash_from_word(sender, created, instance, **kwargs):
if created:
flash_wanted = Word.objects.filter(add_to_review=True)
instance._meta.model.objects.all()
target_word = instance.target_word
source_word = instance.source_word
deck_name = instance.deck_name
user = instance.user
if flash_wanted:
flash = Flashcard.objects.create(owner=user, question=target_word,answer=source_word,deck=Deck.objects.get(name=deck_name,owner=user))
post_save.connect(flash_from_word, sender=Word)