CODEWITHSUNDEEP
pythondjangopython-3.5
PSc
PSc

Reputation: 46

ManyToManyField not working

I want to create the relationship between a person and the news article it got mentioned in.

person/models.py

class Person(models.Model):
    first_name = models.CharField(max_length=20)
    last_name = models.CharField(max_length=40)
    news_mentioned = models.ManyToManyField(News, blank=True)

news/models.py

class News(models.Model):
    title = models.CharField(max_length=250)
    abstract = models.TextField(max_length=1000, null=True, blank=True)
    description = models.TextField(max_length=5000, null=True, blank=True)
    url = models.URLField(unique=True)
    ne_person = models.CharField(max_length=250, blank=True, null=True)

Extract from the celery task:

article = News.objects.get(pk=pk)
person = Person.objects.update_or_create(first_name=fname, last_name=lname)
person.save()
mentioned = Person.objects.get(person.id).news_mentioned(article.id)

What am I making wrong here

Upvotes: 0

Views: 1706

Answers (2)

Jann
Jann

Reputation: 1829

The models are correct. To add an Article to the Person you need to use .add()

s. https://docs.djangoproject.com/en/1.10/topics/db/examples/many_to_many/#many-to-many-relationships

Try it like this:

article = News.objects.get(pk=pk)
person, created = Person.objects.update_or_create(first_name=fname, last_name=lname)
person.save()
person.news_mentioned.add(article)
mentioned = person.news_mentioned.all()

Upvotes: 1

PSc
PSc

Reputation: 46

I did isolate the problem and it turned out that the issue is related to update_or_create, because it returns a Tuple.

It now works like this:

            person, created = Person.objects.update_or_create(first_name=fname, last_name=lname)
            person.save()
            article = News.objects.get(pk=pk)
            person.news_mentioned.add(article)

Upvotes: 1

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