RubyLetter - A Rubyist's Guide to Postgresql's Explain
If you want to understand why your database queries maybe aren’t as fast as they used to be, nothing beats a little feature of postgres called explain . It’s a simple idea. Just ask postgres to explain how it plans to perform a query and it’ll tell you. You can even have it execute the query it and compare expected performance to actual. Sound familiar? You may have seen explain before. Ever sinc
RubyLetter - An Easier Way to Think About `self`
Ruby’s self keyword is one of those things that makes no sense until it does. Even experienced Rubyists sometimes forget its more obscure uses. Here are a few examples: To access instance methods from a mixin: self.name To create class methods: def self.my_method To access the metaclass: class << self They look arbitrary, like facts to be memorized. But there is an underlying structure. When you u
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RubyLetter - Shared Libraries: How Ruby and C Work Together
RubyLetter - Ruby's Mysterious Triple Equals Operator, a.k.a. Case Equality Operator
