Fixed Notion pages mention bug and added function to get them

[guilherme-abcam]

A sample database with fields filled with Notion pages mentions

The result when trying to get the value

---

The result with this fix

And the new function to get the mentioned pages in a PageBlock array.

[jamalex]

This is fantastic, thanks for the contribution!

There are several types of structures (page mentions, reminders, tags of people, and I think a few more) that aren't currently handled by the Markdown <> Notion conversions. The tricky part is that we want it to be bidirectional, so that if the same markdown is set back onto a field, it restores the original Notion data structures internally. For page mentions, this should be straightforward enough, as we can parse the markdown link, see that it's a page reference, and turn it back into a page reference in Notion's internal structure. For things like reminders and people references, the Markdown representation is less clear.

Given the tight coupling between the parsing and conversion, and the need to go in both directions, I'm thinking it would be better to handle this conversion (the _convert_notion_to_python part of your code) within the notion_to_markdown function. And then we'll need to add handling in markdown_to_notion to catch the special link type and turn it back into the appropriate Notion structure.

Would you be interested to take a stab at that?

[shanez]

This causes a TypeError if the page doesn't have an icon or title.