design-patterns

class UserRegistrationService
  class Result
    attr_reader :user, :errors

    def initialize(success:, user: nil, errors: [])
      @success = success

class UserRegistrationForm
  include ActiveModel::Model
  include ActiveModel::Attributes

  attribute :email, :string
  attribute :name, :string

package com.example.demo.model;

import lombok.Builder;
import lombok.Data;
import java.time.LocalDateTime;

class UserSearchQuery
  def initialize(relation = User.all)
    @relation = relation
  end

  def call(params)

from abc import ABC, abstractmethod


class UnknownChannel(Exception):
    pass

class ApplicationCommand
  Result = Struct.new(:value, :errors) do
    def success?
      errors.nil? || errors.empty?
    end

class ProjectPresenter
  def initialize(project, include_tasks: true)
    @project = project
    @include_tasks = include_tasks
  end