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Database-Backed Unique Slugs with Retry

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                  class AddUniqueSlugToArticles < ActiveRecord::Migration[6.1]
  def change
    add_column :articles, :slug, :string, null: false
    add_index :articles, :slug, unique: true
  end
end

                  class Articles::Create
  def initialize(params)
    @params = params
  end

  def call
    Article.create!(@params.merge(slug: build_slug(@params.fetch(:title))))
  rescue ActiveRecord::RecordNotUnique
    Article.create!(@params.merge(slug: "#{build_slug(@params.fetch(:title))}-#{SecureRandom.hex(3)}"))
  end

  private

  def build_slug(title)
    title.to_s.parameterize.presence || SecureRandom.hex(4)
  end
end

Slug generation is deceptively racy under concurrency. Use a unique index plus retry with a suffix. Keep it deterministic and fast; don’t query in a loop without bounds.

Sarah Chen

More from Sarah Chen

Database-Backed Unique Slugs with Retry

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More from Sarah Chen