Rails Development Patterns
Build modern Rails applications with MVC architecture, Active Record, Hotwire, and production-ready patterns.
Core Patterns
Controller
class UsersController < ApplicationController before_action :set_user, only: [:show, :edit, :update, :destroy]
def index @users = User.all end
def create @user = User.new(user_params)
if @user.save
redirect_to @user, notice: 'User created successfully'
else
render :new, status: :unprocessable_entity
end
end
private
def set_user @user = User.find(params[:id]) end
def user_params params.require(:user).permit(:name, :email) end end
Model
class User < ApplicationRecord has_many :posts, dependent: :destroy
validates :email, presence: true, uniqueness: true validates :name, presence: true, length: { minimum: 2 }
scope :active, -> { where(active: true) }
def full_name "#{first_name} #{last_name}" end end
Service Object
class UserRegistrationService def initialize(user_params) @user_params = user_params end
def call User.transaction do user = User.create!(@user_params) send_welcome_email(user) user end rescue ActiveRecord::RecordInvalid => e OpenStruct.new(success?: false, error: e.message) end
private
def send_welcome_email(user) UserMailer.welcome(user).deliver_later end end
Best Practices
-
Follow Rails conventions
-
Use service objects for complex logic
-
Implement proper validations
-
Use concerns for shared behavior
-
Write comprehensive tests
-
Use background jobs
-
Implement caching
-
Follow RESTful routing
Resources