ledermann/rails-settings

class RailsSettingsMigration < ActiveRecord::Migration[5.0]
  def self.up
    create_table :settings do |t|
      t.string :var, null: false
      t.text :value
      t.references :target, null: false, polymorphic: true
      t.timestamps null: true
    end
    add_index :settings, %i[target_type target_id var], unique: true
  end

  def self.down
    drop_table :settings
  end
end