Ruby Snippets

# Basic block usage
numbers = [1, 2, 3, 4, 5]

# Each block
numbers.each do |num|
  puts num
end

# Map with block
squares = numbers.map { |num| num ** 2 }

# Select with block
even = numbers.select { |num| num.even? }

# Custom method with block
def custom_iterator
  yield if block_given?
end

custom_iterator { puts "Block executed!" }

module Printable
  def print_info
    puts "#{self.class}: #{self.to_s}"
  end
end

class Person
  include Printable
  attr_accessor :name, :age

  def initialize(name, age)
    @name = name
    @age = age
  end

  def to_s
    "#{name} (#{age} years old)"
  end

  def self.create_adult(name)
    new(name, 18)
  end
end

person = Person.new("John", 30)
person.print_info

class DynamicMethods
  # Define methods dynamically
  [:foo, :bar, :baz].each do |method_name|
    define_method(method_name) do |arg|
      puts "Called #{method_name} with #{arg}"
    end
  end

  # Method missing
  def method_missing(name, *args)
    if name.to_s =~ /^find_by_(.*)/
      attribute = $1
      puts "Finding by #{attribute} with value #{args.first}"
    else
      super
    end
  end
end

obj = DynamicMethods.new
obj.foo("test")
obj.find_by_name("John")

# Model definition
class User < ApplicationRecord
  has_many :posts
  validates :email, presence: true, uniqueness: true
  scope :active, -> { where(status: 'active') }

  def self.search(query)
    where("name LIKE ? OR email LIKE ?", "%#{query}%", "%#{query}%")
  end
end

# Usage examples
user = User.create!(name: 'John', email: 'john@example.com')

# Associations
user.posts.create!(title: 'Hello World')

# Scopes and queries
active_users = User.active
search_results = User.search('john')

# Eager loading
users_with_posts = User.includes(:posts).where(status: 'active')