discourse/db/migrate/20170501191912_add_upload_id_to_theme_fields.rb

# frozen_string_literal: true

class AddUploadIdToThemeFields < ActiveRecord::Migration[4.2]
  def up
    remove_index :theme_fields, %i[theme_id target name]
    rename_column :theme_fields, :target, :target_id

    # we need a throwaway column here to keep running
    add_column :theme_fields, :target, :integer
    execute "UPDATE theme_fields SET target = target_id"

    change_column :theme_fields, :name, :string, null: false, limit: 30

    add_column :theme_fields, :upload_id, :integer
    add_column :theme_fields, :type_id, :integer, null: false, default: 0

    add_index :theme_fields,
              %i[theme_id target_id type_id name],
              unique: true,
              name: "theme_field_unique_index"
    execute "UPDATE theme_fields SET type_id = 1 WHERE name IN ('scss', 'embedded_scss')"
  end

  def down
    remove_column :theme_fields, :target
    execute "drop index theme_field_unique_index"
    rename_column :theme_fields, :target_id, :target
    remove_column :theme_fields, :upload_id
    remove_column :theme_fields, :type_id
    add_index :theme_fields, %i[theme_id target name], unique: true
  end
end