Django - how to add manytomany data when saving a model?

Question

Django

Good afternoon. Django 4 has a Post model and a DictWords model. There is a ManyToMany relationship between them. The task is that when saving a post, the entire text is divided into separate words and saved to the DictWords dictionary of words with setting up a connection between the post and these words.
The question is - in which direction to dig? Signals - m2m_changed? Thank you.

Answer 1

Did something like this:

@receiver(pre_save, sender=Posts)
def my_handler(sender, **kwargs):
    instance = kwargs.pop('instance', None)
    result_list = []
    for w in instance.post.split():
        res = ''
        for i in w.lower():
            if i.isalpha():
                res += i
        if res and not res in result_list:
            result_list.append(res)
    for i in result_list:
        obj, is_created = DictWords.objects.get_or_create(name=i)
        instance.list_words.add(obj)