Very simple and stupid key-value store using ActiveRecord

example.rb

# Use KeyValue to store globally unique data

KeyValue.set('api_key', '123')   # => true
KeyValue.get('api_key')          # => '123'

# You can use the alternate syntax:

KeyValue['api_key'] = '123'      # => true
KeyValue['api_key']              # => '123'

# It return `nil` for undefined keys:

KeyValue.get('undefined')        # => nil

key_value.rb

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

  def self.get(key)
    where(key: key).first.try :value
  end

  def self.set(key, value)
    where(key: key).first!.update_column(:value, value)
  rescue
    create(key: key, value: value)
  end

  class << self
    alias_method :[], :get
    alias_method :[]=, :set
  end

end