Object needs to have a value for field "id" before this many-to-many relationship can be used in Django

Question

I have the following code in my models.py:

class Tag(models.Model):
    name = models.CharField(max_length=75)

class Article(models.Model):
    tags = models.ManyToManyField(Tag)

    def save(self, *args, **kwargs):
        for tag in self.tags:
            print tag.name
        super(Article, self).save(*args, **kwargs)

When I try to create an article from the admin panel, I get the following error:

ValueError: "<Article>" needs to have a value for field "id" before this many-to-many relationship can be used.

How can I fix this problem? I need to access and iterate the tags before saving the article. Thanks!

Answer 1

Your Declaration of

form.save_m2m()

should be after

obj.save()

After saving of object Many to Many field will add