Bill Burcham’s memeRocket

In this episode, your fearless Jedi delves within the dark tree of associations, with_scope, inner joins, duck typing and meta-programming all in an effort to keep DRY…

In Joyomi I create an Omi when I lend you a book. I can optionally share that Omi with you. If I do, then the Omi shows up in the “Omis Shared With Me” tab in your dashboard. Sharing. Mkay. Social networking 101.

Now the query for a Joyomi user to find his own Omi’s (one’s he’s created) is trivial. The user model simply has_many omis. No brainer. On the other hand, going in the opposite direction and finding all the Omi’s that my friends have shared with me is decidedly non-trivial. In fact it’s downright tricky. It involves a big long series of joins. This is further complicated by the fact that in order to address potential SPAMming we don’t show you Omi’s that were created by folks who are not in your contact list. Got that? Good.

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In Fight id Proliferation I highlighted the prevalent misunderstanding of the prototype API’s insert_html, replace_html and friends that is evident both in the Prototype documentation and in Rails. Due to that misunderstanding, many of us are polluting our HTML with many more id attributes than would otherwise be necessary. In the original post I proposed a fix to Rails to remedy the situation and allow us to use CSS selectors to identify a target HTML element for the various calls. In this post I provide a workaround you can use now, while waiting for a cleaner fix.

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