I’ve been working with a client to optimize parts of their Rails application. The problem is that a method in the app does some simple updating of a few model objects but because the model has so many relations it goes through a ton of unnecessary callbacks. There are issues related to data concurrency which means you have to do the callbacks but in this particular situation there won’t be any concurrent updates to the data so the callbacks can be omitted. The solution to the problem was trivial when using the save_without_callbacks Rails plugin. Just adding a simple:

before the update_attribute reduced the number of SQL UPDATE queries from 90 to 8. Lesson learned. If you need to skip model relation callbacks on save this plugin is for you. Be careful about data concurrency issues though.

I was surprised to come up empty handed when searching for a Google Base Rails plugin. I wanted something that would allow me to easily create a feed into Google Base using their API. I didn’t find anything so I took the quick and short term solution and created my own Google Base xml feed. Its based on RSS 2.0 so its not incredibly difficult but I could have saved a few minutes if it was already written for me so here it is. My Google Base xml generator in Ruby on Rails. Its not complete and only has the fields that I specifically wanted for my products. Your feed will likely contain other fields so check the Google Base docs for more information on customizing it. You’ll notice that I thought Google Base was going to pull my xml feed when I initially wrote this but it turns out I have to use the API and this is just good for generating the xml file which you then have to manually upload to Google Base.

First, I added this to route.rb

Then I created controllers/google_controller.rb

And finally, I create views/google/base_feed.rxml

There are obviously calls to helper methods in the base_feed.rxml file like product_url and photo_url. I use those so I can easily generate pretty seo urls anywhere I need them. You’ll need to replace those with however you create your urls.

This should suffice for at most 31 days when all the products I just added will expire in Google Base. I doubt I’ll bother creating a Google Base Rails plugin unless I see a noticeable increase in traffic and sales so don’t hold your breath.