Async handler to manage multiple db calls within a Rails Controller Action concurrently, without any hassle

async_handler.rb

def async_handler(*args)
  dass = self
  threads = []
  args.each do |t|
    threads << Thread.new do 
      ActiveRecord::Base.connection_pool.with_connection do
        dass.send t
      end
    end
  end
  threads.each {|t| t.join}
end

# Usage (within a rails action)
# 
# def show
#   def first
#     #call db - waits for response
#   end
  
#   def second
#     #call db - waits for response
#   end
  
#   async_handler :first, :second
# end