rails

class OrderPresenter < SimpleDelegator
  attr_reader :current_user

  def initialize(order, current_user:)
    super(order)
    @current_user = current_user

class OrderCreationService
  Result = Struct.new(:success?, :order, :error, keyword_init: true)

  def initialize(customer:, line_params:)
    @customer = customer
    @line_params = line_params

class AddSoftDeleteToDocuments < ActiveRecord::Migration[7.0]
  disable_ddl_transaction!

  def change
    add_column :documents, :marked_for_deletion_at, :datetime, null: true

module MyApp
  class Application < Rails::Application
    config.load_defaults 6.1

    # API-only mode
    config.api_only = true

class CommentsController < ApplicationController
  before_action :set_post

  def create
    @comment = @post.comments.build(comment_params)

# In rails console
query = Post.joins(:author)
           .where(published_at: 1.week.ago..Time.current)
           .where(users: { status: 'active' })
           .order(created_at: :desc)

module Result
  def self.Success(value)
    Success.new(value)
  end

  def self.Failure(error)

class PostsController < ApplicationController
  def create
    @post = current_user.posts.build(post_params)

    if @post.save
      flash[:success] = 'Post was successfully created.'

Rails.application.routes.draw do
  concern :tabs do
    get :profile, on: :collection
    get :billing, on: :collection
    get :security, on: :collection
  end

class Comment < ApplicationRecord
  belongs_to :post
  belongs_to :author, class_name: "User"

  validates :body, presence: true, length: { maximum: 5_000 }

Rails.application.routes.draw do
  namespace :api do
    namespace :v1 do
      resources :users, only: [:index, :show, :create, :update]
      resources :posts do
        resources :comments, only: [:index, :create]

class CreateAccountsAndLedger < ActiveRecord::Migration[7.1]
  def change
    create_table :accounts do |t|
      t.string :name, null: false
      t.string :currency, null: false, default: "USD"
      t.bigint :balance_cents, null: false, default: 0