# frozen_string_literal: true

class AddBookmarkPolymorphicColumns < ActiveRecord::Migration[6.1]
  def change
    if !column_exists?(:bookmarks, :bookmarkable_id)
      add_column :bookmarks, :bookmarkable_id, :integer
    end

    if !column_exists?(:bookmarks, :bookmarkable_type)
      add_column :bookmarks, :bookmarkable_type, :string
    end

    if !index_exists?(:bookmarks, [:user_id, :bookmarkable_type, :bookmarkable_id])
      add_index :bookmarks, [:user_id, :bookmarkable_type, :bookmarkable_id], name: "idx_bookmarks_user_polymorphic_unique", unique: true
    end
  end
end