Re: Beginner: ManyToManyFields error creating the model / adding values by the Admin Module or the Shell

> Den 04/11/2014 kl. 23.07 skrev lnzy35en@gmx.de:
>
>
> Hi Erik,
>
> the idea was, that one Author can write in more than one language (eg. en and de), or no one at all. This was the background to use the ManyToManyField.

Yes, but then you simply create multiple Interest objects, right? One for every author-language combination. Your field names are singular, not plural, which tells me you should use a ForeignKey field. The current Interest model links multiple Authors with multiple Languages, which doesn't make much sense.

If you want to use ManyToManyField, then you put a "interests" field to Language directly on the Author model.

> But the "error" Message must have an other reason?

The direct cause is that you are trying to print self.author in the __str__ method. self.author is a ManyRelatedManager, so you should use self.authors.all() to access the individual authors. But you should change you models instead of fixing this error :-)

Erik

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