xF1 Add extra fields to any content using separate table

[ven0m]

Heisenberg submitted a new resource:

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- Extending DataWriter and Model to work with joined table.

I would like to share my experience of adding extra fields to any built-in content. Let's consider the wiki addon. Its articles and comments are extended posts in some pre defined node. So there is a following problem: we need to generate prepared version of post with added table of contents and autolinking since onfly processing of that would kill performance.

We need extra field message_prepared for that.
There are 2 ways to add it:

1. Alter xf_post table
2. Join another table...

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