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Rails: calculated column caching

Sometimes you’re working on a Rails project and you think: “hey! This should be easy!”. Well, most of the time it is. I’m working on a project that allows people to rate objects (what they really are doesn’t matter at all). I’m using the acts_as_rateable plugin which creates an extra database table containing all ratings. I also have a table with my objects. Using the plugin I’m now able to do the following: