#deep-dive

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#ruby
  • 9 min read
    Why does Rails put the type column first in an index for a polymorphic association?
    Last week, I had a discussion with a coworker about how Rails indexes columns used in polymorphic associations. He thought that the order of columns in the index should be flipped - instead of indexing by type and ID, it should index by ID and type - as that way the most restrictive column is...
  • 25 min read
    Deconstructing Action Cable
    I knew what Action Cable was about and roughly how it worked since it was released. But lately I've developed a much deeper understanding of it because I had to extend it and explain its internals to others. The following is how I explained Action Cable to myself. I took a top-down approach,...