using ActiveSupport::Configurable

gistfile1.rb

class Employee
  include ActiveSupport::Configurable
end

employee = Employee.new
employee.config.research_lab_entry = :not_allowed
employee.config.paid_leave = 5

class Employee
  include ActiveSupport::Configurable
  config_accessor :research_lab_entry, :paid_leave
  
  # The config options are now also available as: 
  # employee.research_lab_entry
  # employee.paid_leave
end

# Set the config option at the class level
Employee.config.paid_leave = 5

# Create a new object and check the value
employee = Employee.new
employee.config.paid_leave # => 5

# Set a new value at the object-level
employee.config.paid_leave = 3

# Now check the value at the class level
Employee.config.paid_leave # => 3