How to invoke method in ruby?

Guys,

         Do you aware about the method invocation in ruby using different ways?

 want to know? There are 3 different ways to invoke a method in ruby.

a) Using period operator

    eg. we have class called 'Car' and we need to access the method called 'car_detail'

    car = Car.new

    car.car_detail

b) Using .send method

    car = Car.new

    car.send(:car_detail)

c) Using .call method

    car = Car.new

    car.method(:car_detail).call

So, these are the three ways to invoke method in ruby.  Hope this post will help you.

Run rake task in background

Hey rubies,

                Some time we need immediate response at that time we have option to run functionality in background by invoking rake task.

Here is the small example

Assume we have task called 'generate_random_number' which we need to invoke in background. below is the steps for that.

Invoke the background task by

call_rake 'generate_random_number', {:initial => 10}

definition for call_rake

def call_rake(task, options = {})   

    # define rails environment as option etc...
    options[:rails_env] ||= RAILS_ENV

    # collect argument list

    args = options.map { |n, v| "#{n.to_s.upcase}='#{v}'" }         

    # invoke task from rails and generate log
    system "rake #{task} #{args.join(' ')} --trace 2>&1 >> #{RAILS_ROOT}/rake.log &"   
  end

Here is the task definition.

desc "Generate Random Number"

task :generate_random_number, [:initial] => :environment do |t, args|

    puts "here is your random number " + rand(args[:initial] ).to_s

end

This the way how task execute in background. If you have any query or suggestion then post the comment.