pewniak747

"files": ["src/index.ts", "src/apidoc.d.ts"]

pewniak747

export interface Order {
  id: number;
  productId: number;
  quantity: number;
  shipDate: string;
  status: "placed" | "approved" | "delivered";
  complete: boolean;
}

pewniak747

class SomeService
  def call
    call_service_a
  end
  
  private
  
  def service_a
    # ... uses status objects 
  end

pewniak747

case result
when Success then
  # success handler
when SpecificError then
  # specific error handler
when Error then
  # error handler
end

pewniak747

Success = Struct.new(:data) do
  def success?
    true
  end
end
 
Error = Struct.new(:error, :code, :details) do
  def error_message
    error.to_s
  end

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class ServiceObject
  attr_reader :input

  # ...

  private
  
  def private_method_with_input
    input.field # access input as method
  end

pewniak747

class APIResponder < ActionController::Responder

  private

  def display(resource, options = {})
    super(resource.data, options)
  end

  def has_errors?
    !resource.success?

pewniak747

describe CreateInvoice do
  
  subject { CreateInvoice.new(user, notification_center, form) }
    
  let(:user) { instance_double("User", subscriber?: true) }
  let(:notification_center) { instance_double("NotificationCenter", invoice_created: nil)
  let(:form) { instance_double("InvoiceForm", company_name: "ACME Corp.", billing_date: Time.now)

  describe "passing valid parameters" do

pewniak747

class InvoicesController < ApplicationController
  # ...

  def create
    form = InvoiceForm.new(params)
    result = CreateInvoice.new(current_user, form).call
    @invoice = result.invoice
    if result.success?
      redirect_to @invoice
    else

pewniak747

class InvoiceForm
  attr_reader :params
  def initialize(params)
    @params = params
  end
  
  def billing_date
    Time.new(params[:year], params[:month], params[:day]) if time_data_present?
  rescue ArgumentError
  end