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PawWalk Academy
Ruby & Rails
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Map
👋
00 · Welcome to Ruby
0/3
Why Ruby & Rails
~9m
Set up your machine
~9m
Hello, Ruby
~9m
💎
01 · Ruby Basics
0/6
Variables & Everything is an Object
~11m
Strings & Interpolation
~9m
Symbols & nil
~9m
Conditionals the Ruby Way
~11m
Methods
~9m
puts, p, and Running Files
~8m
🧺
02 · Collections & Blocks
0/6
Arrays
~11m
Hashes
~11m
Blocks: each
~11m
Transform: map & select
~9m
Crunch: sum, sort_by, min_by
~11m
Ranges & capstone
~8m
🏗️
03 · Classes & Modules
0/6
Your First Class
~11m
attr_accessor & Friends
~9m
Instance Methods & self
~11m
Class Methods & Constants
~9m
Inheritance
~9m
Modules & Mixins
~11m
🧰
04 · Idioms, Errors & Gems
0/6
Truthiness & Guard Clauses
~11m
Safe Navigation & Duck Typing
~12m
Errors: raise & rescue
~11m
Files & JSON
~11m
Gems & Bundler
~11m
RuboCop & Writing Ruby that Reads Well
~14m
🕸️
05 · HTTP & Rack
0/4
How the Web Talks
~11m
The Rack Contract
~9m
Routing by Hand
~11m
Why Frameworks Exist
~9m
🚂
06 · Rails Anatomy
0/5
rails new
~9m
MVC in One Picture
~6m
Scaffold a Walker
~12m
Routes
~11m
rails console
~9m
🗄️
07 · ActiveRecord
0/5
Migrations
~14m
Validations
~11m
Associations
~15m
The Query Interface
~12m
Seeds & the N+1 Trap
~12m
🔌
08 · REST & JSON Controllers
0/5
render json:
~11m
Params & Strong Params
~11m
before_action & Thin Controllers
~9m
Status Codes Done Right
~12m
API-only Rails & the Bridge
~11m
🐾
09 · PawWalk Kickoff
0/5
The Real Thing
~12m
The Schema
~11m
Models: User, Walker, Dog
~12m
Models: Booking & Friends
~14m
Seeds & Your First Real Endpoint
~14m
🔐
10 · Auth: Passwords & Tokens
0/5
Passwords Done Right
~11m
JWT 101
~11m
Signup & Login
~9m
The Authentication Concern
~9m
Prove It with curl
~8m
📅
11 · Bookings: The Core API
0/5
Booking Rules as Code
~11m
Reading Bookings: Scope Everything Through current_user
~11m
Create: Never Trust the Client with Money
~11m
Cancel: Guarding State Transitions
~11m
The Full Flow with curl
~8m
💳
12 · Payments & Background Jobs
0/5
How Card Payments Work
~12m
The Pay Endpoint
~12m
Webhooks: Stripe Calls You Back
~9m
Background Jobs with Solid Queue
~17m
Prove It Without a Stripe Account
~14m
📍
13 · Live Tracking with Action Cable
0/5
Real-Time on the Web
~15m
Authenticating the Socket
~11m
WalkChannel: Subscribe & Stream
~15m
Walk Sessions: Start & End
~12m
Pings, Broadcast & Prove It
~15m
✅
14 · Testing the API
0/5
The Loop & Minitest
~14m
Fixtures: Your Test World
~14m
Model Tests
~12m
Integration Tests: Test the API like a Client
~12m
Stubs, Jobs, Mailers & the Whole Suite
~15m
🚀
15 · Deploy & Graduation
0/5
From Laptop to Server
~9m
The Dockerfile
~15m
Kamal: deploy.yml
~17m
Prove It on Your Machine
~11m
Ship It & Graduation
~12m
🏎️
16 · Query Performance
0/4
The N+1 You Already Shipped
~8m
includes, strict_loading & Friends
~8m
EXPLAIN & Indexes
~11m
Counter Caches
~11m
⚡
17 · Caching Layers
0/4
HTTP caching for an API
~8m
Ship it: conditional GET on the walkers index
~8m
Rails.cache & key-based expiry (Solid Cache)
~9m
When caches lie
~12m
⚙️
18 · A Hotwire Admin Dashboard
0/4
API-only, meet Hotwire
~8m
Turbo Frames: scoped updates
~8m
Turbo Streams over Solid Cable
~8m
Stimulus: just enough JS
~8m
💰
19 · Money: Payouts & a Ledger
0/4
Never store money as a float
~6m
Idempotent payouts
~8m
A double-entry ledger
~8m
Reconciliation
~6m
🛡️
20 · Hardening the Public API
0/4
Versioning
~8m
Pagination
~6m
Rate limiting with rack-attack
~6m
Security scanning
~6m
🎓
21 · Observability, Scale & Graduation
0/4
Instrumenting Rails
~8m
Scaling the database
~8m
Scaling background work
~6m
Ship it & graduation
~8m
🧩
22 · Data Structures & Problem-Solving
0/7
Big-O & Your Two Workhorses
~14m
Stacks & Queues
~11m
Linked Lists
~11m
Trees & Binary Search Trees
~12m
Graphs: BFS & DFS
~11m
Heaps & Priority Queues
~11m
Hashing Patterns (capstone)
~11m
🧠
23 · Design Patterns (All 23 GoF)
0/23
Singleton
~6m
Factory Method
~6m
Abstract Factory
~6m
Builder
~6m
Prototype
~6m
Adapter
~6m
Bridge
~6m
Composite
~6m
Decorator
~6m
Facade
~6m
Flyweight
~6m
Proxy
~6m
Chain of Responsibility
~6m
Command
~6m
Interpreter
~6m
Iterator
~6m
Mediator
~6m
Memento
~6m
Observer
~6m
State
~6m
Strategy
~6m
Template Method
~6m
Visitor
~6m
🧬
24 · The Ruby Object Model
0/6
Messages & Arguments
~11m
self — the Default Object
~11m
Scope & Visibility
~11m
The Method Lookup Path
~11m
Singleton Classes & Class Methods
~9m
Equality, Comparison & Copies (Capstone)
~11m
🧩
25 · Blocks, Procs & Lambdas
0/6
Methods That Take Blocks
~9m
Procs & Closures
~9m
Lambdas vs Procs
~11m
Symbol#to_proc & Method Objects
~8m
Composition & Functional Style
~9m
Threads, Fibers & Ractors (Survey)
~9m
🔁
26 · Enumerable, Enumerator & Pattern Matching
0/6
The Enumerable Contract
~8m
Beyond map: The Workhorses
~9m
Enumerators & Lazy Evaluation
~9m
Hashes & Sets in Anger
~8m
Pattern Matching with case/in
~9m
Regexp That Earns Its Keep (Capstone)
~9m
🪄
27 · Metaprogramming & Rails Magic
0/6
Introspection
~9m
send & public_send
~8m
define_method
~8m
method_missing & Ghost Methods
~9m
Hooks & Concerns
~9m
Capstone: Build a Mini validates DSL
~9m
Export progress
Import progress
Reset progress
Module 12 · Payments & Background Jobs — Lesson 2 of 5 · ~12 min
The Pay Endpoint
Config lives in ENV, not in code
Before the endpoint itself, one line decides where the Stripe secret key comes from:
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