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Don't cache ActiveRecord objects

Hello, new Rails developer! Welcome to WidgetCorp. I hope you enjoyed orientation. Those old corporate videos are a hoot, right? Still, you gotta sit through it, we all did. But anyway, let’s get stuck in.

So as you know, here at WidgetCorp, we are the manufacturer, distributor and direct seller of the worlds highest quality Widgets. None finer!

These widgets are high-value items, it’s a great market to be in, but they’re also pretty complicated, and need to be assembled from any number of different combinations of doo-hickeys, thingamabobs and whatsits, and unless we have the right quantities and types of each, then a particular kind of widget may not actually be available for sale.

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