Simple application-wide flag setter/getter, using ActiveRecord as backend. Would anyone be interested in this as a fully working gem?

app_state.rb

class AppState < ActiveRecord::Base
  attr_accessible :key, :value

  validates :key, presence: true

  serialize :value

  def self.get_value(key, default_value = nil)
    as = AppState.find_by_key(key)
    return default_value if as.blank?

    as.value
  end

  def self.set_value(key, value)
    as = AppState.find_or_initialize_by_key(key)
    as.value = value
    as.save

    value
  end
end

app_state_spec.rb

require 'spec_helper'

describe AppState do
  describe "Validations" do
    it { should validate_presence_of :key }
  end

  describe "set_value" do
    it "should return the value set" do
      a = Date.today
      AppState.set_value(:test1, a).should == a
    end
  end

  describe "get_value" do
    it "should save and return the same value" do
      a = Date.today
      AppState.set_value(:test1, a)
      AppState.get_value(:test1).should == a
    end

    it "should return a value of the same type, that it was set" do
      a = Date.today
      AppState.set_value(:test1, a)
      AppState.get_value(:test1).class.should == a.class

      a = true
      AppState.set_value(:test1, a)
      AppState.get_value(:test1).class.should == a.class

      a = false
      AppState.set_value(:test1, a)
      AppState.get_value(:test1).class.should == a.class

      a = { foo: "bar", xyzzy: 42 }
      AppState.set_value(:test1, a)
      AppState.get_value(:test1).class.should == a.class
    end

    it "should return default value from parameter, if value not already set" do
      AppState.get_value(:test2, 42).should == 42

      AppState.set_value(:test2, 99)
      AppState.get_value(:test2, 42).should == 99
    end
  end
end

create_app_states.rb

class CreateAppStates < ActiveRecord::Migration
  def change
    create_table :app_states do |t|
      t.string :key
      t.text :value

      t.timestamps
    end
  end
end