A couple of callback gotchas (and a Rails 5 fix)
A Couple of Callback Gotchas (And a Rails 5 Fix) ActiveRecord callbacks are an easy way to run code during the different stages of your model’s life. For example, say you have a Q&A site, and you want to be able to search through all the questions. Every time you make a change to a question, you’ll want to index it in something like ElasticSearch. Indexing takes a while and isn’t urgent, so you’ll
4 simple memoization patterns in Ruby (and one gem)
4 Simple Memoization Patterns in Ruby (And One Gem) Memoization is a technique you can use to speed up your accessor methods. It caches the results of methods that do time-consuming work, work that only needs to be done once. In Rails, you see memoization used so often that it even included a module that would memoize methods for you. Later, this was controversially removed in favor of just using
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