MIGRATION_CLASS =
  if ActiveRecord::VERSION::MAJOR >= 5
    ActiveRecord::Migration["#{ActiveRecord::VERSION::MAJOR}.#{ActiveRecord::VERSION::MINOR}"]
  else
    ActiveRecord::Migration
  end

class CreateFriendlyIdSlugs < MIGRATION_CLASS
  def change
    create_table :friendly_id_slugs do |t|
      t.string :slug, null: false
      t.integer :sluggable_id, null: false
      t.string :sluggable_type, limit: 50
      t.string :scope
      t.datetime :created_at
    end
    add_index :friendly_id_slugs, [ :sluggable_type, :sluggable_id ]
    add_index :friendly_id_slugs, [ :slug, :sluggable_type ], length: { slug: 140, sluggable_type: 50 }
    add_index :friendly_id_slugs, [ :slug, :sluggable_type, :scope ], length: { slug: 70, sluggable_type: 50, scope: 70 }, unique: true
  end
end