Read Replica Routing for GET-Heavy Endpoints

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                  module Replica
  module_function

  def read
    ActiveRecord::Base.connected_to(role: :reading, prevent_writes: true) do
      yield
    end
  end
end

                  class PublicProfilesController < ApplicationController
  skip_before_action :authenticate_member!

  def show
    @profile = Replica.read do
      Member.includes(:snips).find_by!(nickname: params[:nickname])
    end
  end
end

For apps with replicas, route read-only code paths to reading role and enforce prevent_writes. This is a strong reliability move: accidental writes on replicas become exceptions instead of silent data loss.

Sarah Chen

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Read Replica Routing for GET-Heavy Endpoints

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