[Python] Django TypeError: Model instances without primary key value are unhashable

I have my models.py as follows:

class Article(models.Model):
date = models.DateTimeField(null=True, blank=True)
title = models.TextField(default=None, null=True, blank=True)
content = models.TextField(default=None, null=True, blank=True)
author = models.TextField(default=None, null=True, blank=True)
url = models.CharField(max_length=255, default=None, null=True, blank=True, unique=True)


class Keyword(models.Model):
word = models.CharField(max_length=80)

def __str__(self):
return self.word
article = models.ForeignKey(Article, related_name='keywords_found', null=True, blank=True)


I encounter an error when I try to save the data like this:

Article.objects.create(date=publish_date, title=article.title, content=article.text, author=article.authors, url=url, keywords_found=keywords_found)


Here, keywords_found is a list of Keyword objects.

The error is:

TypeError: Model instances without primary key value are unhashable


Where am I going wrong?

Django version : 1.10

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