Ruby language is dynamic and robust. We can define methods inside ruby classes at runtime.
# bash
class A
define_method :a do
puts "hello"
end
define_method :greeting do |message|
puts message
end
end
A.new.a #=> hello
A.new.greeting 'Ram ram' #=> Ram ram
Can you imagine using dynamic methods below 24 lines of code is optimized to just 8 lines
To know more on below code read
# Earlier code
class ApplicationController < ActionController::Base
protect_from_forgery
helper_method :current_staff, :current_employee, current_admin
def authenticate_staff!(opts={})
current_staff || not_authorized
end
def current_staff
current_user if current_user.is_a? Staff
end
def authenticate_employee!(opts={})
current_employee || not_authorized
end
def current_employee
current_user if current_user.is_a? Employee
end
def authenticate_admin!(opts={})
current_admin || not_authorized
end
def current_admin
current_user if current_user.is_a? Admin
end
end
# New Version using dynamic methods
%w(Staff Employee Admin).each do |k|
define_method "current_#{k.underscore}" do
current_user if current_user.is_a?(k.constantize)
end
define_method "authenticate_#{k.underscore}!" do |opts={}|
send("current_#{k.underscore}") || not_authorized
end
end
