News Aggregator: NoneType' does not support indexing?

[ryan]

Hi @andrea.vivante,

Thanks for providing the clone link.

The error TypeError: ‘NoneType’ does not support indexing was caused by the Data Binding of the category_label in your ArticleView Form trying to use square brackets on something that’s None.

The Data Binding was self.item['category']['name']. In this instance self.item is an article from your database and one of the articles didn’t have a category linked, so the value of self.item['category'] is None. Therefore, trying to use square brackets on it will produce the error you’re seeing.

For more information, my colleague Meredydd explained this in more depth here:

NoneType does not support indexing

Hi there! This error message tells you exactly what has gone wrong, even if there is some Python jargon in there. Let’s pull it apart: TypeError: ‘NoneType’ does not support indexing In Python “indexing” is a word for using square brackets on something. This error message means we tried to use square brackets on something that’s None (the empty value in Python), and that’s not allowed. while setting self.label_1.text = self.item['user']['email'] Aha! Look at what we’re using square brac…

If you add a category to the article row that is missing it, your error will be solved.