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preload_for_callbacks

🏗️ Avoid N+1 in Callbacks by Preloading Dependencies​

Callbacks that touch associations can trigger N+1 queries when run per record. Preload dependencies in bulk before invoking callbacks or use after_commit batching to minimize database hits.

# In a service object
records = Order.includes(:line_items, :customer).where(status: 'pending')
records.find_each(batch_size: 500) do |order|
  order.process!   # callbacks will reuse preloaded associations
end