counter_culture_setup

📦 Installing and Configuring Counter Culture

Counter Culture helps you keep counter caches in sync without manual SQL. First, add it to your Gemfile and run bundler to install:

gem 'counter_culture'

Next, generate a migration to add a counter column to the parent model (e.g., comments_count on posts):

rails generate migration AddCommentsCountToPosts comments_count:integer

Then open the generated migration and set a default value and null constraint:

class AddCommentsCountToPosts < ActiveRecord::Migration[6.0]
  def change
    add_column :posts, :comments_count, :integer, default: 0, null: false
  end
end

Run the migration:

rails db:migrate

Finally, configure your Comment model to update the counter cache on Post:

class Comment < ApplicationRecord
  belongs_to :post
  counter_culture :post
end