Alex Kumar

class TrendingPostsService
  CACHE_KEY = 'trending_posts:v1'.freeze
  CACHE_TTL = 15.minutes

  def self.call(limit: 10)
    Rails.cache.fetch(CACHE_KEY, expires_in: CACHE_TTL) do

class AddConstraintsToUsers < ActiveRecord::Migration[6.1]
  def change
    # Null constraints
    change_column_null :users, :email, false
    change_column_null :users, :username, false

class CreateComments < ActiveRecord::Migration[6.1]
  def change
    create_table :comments do |t|
      t.references :commentable, polymorphic: true, null: false
      t.references :author, null: false, foreign_key: { to_table: :users }
      t.text :body, null: false

class ProcessPaymentWorker
  include Sidekiq::Worker

  sidekiq_options queue: :critical, retry: 10

  sidekiq_retry_in do |count, exception|

module Webhooks
  class StripeController < ApplicationController
    skip_before_action :verify_authenticity_token

    def create
      payload = request.body.read

module Api
  module V1
    class PostsController < BaseController
      def index
        # Eager load author and recent comments with their authors
        posts = Post.published

class User < ApplicationRecord
  has_many :posts, foreign_key: :author_id

  validates :email, presence: true,
                    uniqueness: { case_sensitive: false },
                    format: { with: URI::MailTo::EMAIL_REGEXP }

production:
  adapter: postgresql
  encoding: unicode
  pool: <%= ENV.fetch("RAILS_MAX_THREADS", 5) %>
  timeout: 5000
  checkout_timeout: 5

module ApiRequestLogger
  extend ActiveSupport::Concern

  included do
    around_action :log_api_request
  end

class AddCommentsCountToPosts < ActiveRecord::Migration[6.1]
  def up
    add_column :posts, :comments_count, :integer, default: 0, null: false

    # Populate existing counts
    Post.find_each do |post|

class AddLockVersionToPosts < ActiveRecord::Migration[6.1]
  def change
    add_column :posts, :lock_version, :integer, default: 0, null: false
  end
end

class PostSerializer < ActiveModel::Serializer
  attributes :id, :title, :excerpt, :body, :published_at, :views, :likes_count, :comments_count

  attribute :can_edit, if: :current_user_can_edit?

  belongs_to :author, serializer: UserSummarySerializer