Service Object Example

service_object_example.rb

class Invoice
  def process_payment
    # In this manner, it abstracts the logic of payment processing to the service object
    InvoiceServices::Payment.new(self).process
  end
end

class Tracker
  def self.track
    # Do tracking stuff here
  end
end

class Email
  def invoice_paid_mail(invoice)
    # Send email here
  end
end

# As you can see, this service object gives you all the business related logic.
# It generates a Stripe charge, it creates the analytics record and sends the email
# This code below should not be placed to a model since it is business related
class InvoiceServices::Payment
  def initialize(invoice)
    @invoice = invoice
  end
  
  def process
    pay_stripe
    record_analytics
    send_email
  end
  
  def pay_stripe
    Stripe.create_charge(@invoice)
  end
  
  def record_analytics
    Tracker.track('invoice paid!')
  end
  
  def send_email
    Email.invoice_paid_mail(@invoice)
  end
end