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using_counter_cache

🔢 Use counter_cache for Associated Counts​

Maintain a real-time count of associated records without hitting the database every time. Add a _count column and enable counter_cache on the association.

# migration
generate migration AddCommentsCountToPosts comments_count:integer default: 0

# app/models/comment.rb
class Comment < ApplicationRecord
  belongs_to :post, counter_cache: true
end