Optimistic Locking for Collaborative Edits

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                  class AddLockVersionToArticles < ActiveRecord::Migration[6.1]
  def change
    add_column :articles, :lock_version, :integer, null: false, default: 0
  end
end

                  class Admin::ArticlesController < ApplicationController
  def update
    article = Article.find(params[:id])
    article.update!(article_params)
    redirect_to [:admin, article]
  rescue ActiveRecord::StaleObjectError
    redirect_to [:admin, article], alert: 'This article was updated by someone else. Please reload and try again.'
  end

  private

  def article_params
    params.require(:article).permit(:title, :body, :lock_version)
  end
end

If multiple admins edit the same record, use lock_version. Rails will raise on conflicting updates, and you can show a friendly “this changed underneath you” message. It prevents subtle lost updates.

Sarah Chen

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Optimistic Locking for Collaborative Edits

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