discourse/db/migrate/20120629151243_make_expressions_less_generic.rb

# frozen_string_literal: true

class MakeExpressionsLessGeneric < ActiveRecord::Migration[4.2]
  def up
    rename_column :expressions, :parent_id, :post_id
    rename_column :expressions, :expression_type_id, :expression_index
    remove_column :expressions, :parent_type

    add_index :expressions,
              %i[post_id expression_index user_id],
              unique: true,
              name: "unique_by_user"
  end

  def down
    rename_column :expressions, :post_id, :parent_id
    rename_column :expressions, :expression_index, :expression_type_id
    add_column :expressions, :parent_type, :string, null: true
  end
end