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Use links in your JSON to make your Ember app smarter.
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Speed up your tests by telling Capybara WebKit not to hit external APIs.
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Take your queries to the next level with window functions.
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Use SQL EXPLAIN to understand when and why indexes are used (or not).
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Sleep better at night knowing your migrations are reversible.
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Calculations across objects are ripe for using a map and an inject but frequently, with ActiveRecord, the solution is more elegant and faster if we can have SQL do the work instead.
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