CodeSnips

ruby

class Post < ApplicationRecord
  has_many :comments, dependent: :destroy

  # comments_count is maintained by counter_cache on Comment#belongs_to

  scope :stale_comment_counts, lambda {

Counter Cache Repair Job (Consistency Tooling)

rails activerecord counter-cache

by codesnips 3 tabs

ruby

class CounterFlushJob
  include Sidekiq::Job
  sidekiq_options queue: :counters, retry: 3

  def perform
    CounterBuffer.flush_all.each do |field, delta|

Coalesced Counter Cache with Redis Buffering and Nightly Reconciliation in Rails

rails counter-cache redis

by codesnips 4 tabs

ruby

class CounterBuffer
  DELTA_HASH = "counter:deltas".freeze

  READ_RESET = <<~LUA.freeze
    local v = redis.call('HGET', KEYS[1], ARGV[1])
    if v then redis.call('HDEL', KEYS[1], ARGV[1]) end

Debounce Expensive Counter Cache Updates with a Throttled Redis Buffer in Rails

rails redis counter-cache

by codesnips 3 tabs

erb

<%# Subscribe every viewer of this post to its broadcasts %>
<%= turbo_stream_from @post %>

<%# Update the acting user's button to reflect the toggle %>
<%= turbo_stream.replace dom_id(@post, :like_button) do %>
  <%= render "posts/like_button", post: @post %>

Live counter updates with Turbo Streams (likes, votes)

rails hotwire turbo

by codesnips 4 tabs