Perfectly Awesome

Ruby core language, v3.0.2

Arrays     Classes     Continuations     File directories     Exceptions     Fibers     File IO Operations     Hashes     IO Primitives     Numerics     Objects     Procs     Queues     Random Numbers     Ranges     Regular expressions     Strings     Structs     Symbols     Thread     Time    

Data Models

Definition     Naming     Schemas     Creating a Model     Custom Naming     create     read     update     delete    

DB Migrations

Creating     Table definitions     Run/Rollback/Setup/Reset     Editing     Schema Files     Reference Integrity     Seed Data     Old Migrations    

Model Validators

Basics     Helpers     Options     Strict Validation     :if, :unless     Custom     Error Handlers     Error Displays    

Callbacks

Setup     Options     Execution     Skipping     Halting Execution     Relationals     :if, :unless     Classes     DB Transactions    

Model Associations

belongs_to     has_one     has_many     has_many :through     has_one :through     has_and_belongs_to_many     Polymorphic     Self Joins     Tips     Detailed Reference     STI (single table inheritance)    

DB Queries

Get 1 Object     Get Multiple Objects (Batching)     Where     Ordering     Specific Fields     Limit, Offset     Grouping     Having     Override Conditions     Null Relations     Read-Only     DB Locking     Table Joins     Eager Loading     Scopes     find_by_     Enums     Method Chains     Find-or-Build     find_by_sql     exists?     Calculations     Explain    

Generating (Rendering) Views

Defaults     render     redirect_to     head     Asset Tags     yield     content_for     Partials     Nested Layouts    

View Helpers

(partial list. Many more listed here in the API.)     Asset Tag     Atom Feed     Benchmark     Cache     Capture     Date     Debug    

Forms

Basics     Model Handling     Select Boxes     Date & Time Helpers     Arbitrary Object Collections     File Uploads     Custom Form Builders     Parameter Naming     External Resources     Complex Forms     Tag Helpers     form_tag, form_for    

Controls

Controls     Naming     Methods & Actions     Parameters     Sessions     Cookies     XML & JSON     Filters     Request Forgery Protection     Request & Response objects     HTTP Authenication (basic, digest, token)     Streaming & File Downloads     Log Filters     Rescues (500, 404, _from)    

Routing

Intro     Resources     Non-Resource Routing     Custom Resources     Inspect/Test    

Ruby Core Extensions

How to Load     All Objects     Module     Class     String     Symbol     Numeric     Integer     BigDecimal     Enumerable     Array     Hash     Regexp     Range     Date     DateTime     Time     File     Marshal     NameError     LoadError    

Email

Intro     Build     Headers     Methods     Views     Layouts     Previews     Generating URLs     Adding Images     Multipart Emails     Dynamic Delivery     Without Template Rendering     Callbacks     Helpers     Config     Testing     Intercept & Observe    

Background Jobs (Active Job)

Create     Execute     Queues     Callbacks     Email     Internationalization     Supported Arguments     Exceptions     Testing    

File Attachments (Active Storage)

Setup     Attaching     Removing     Linking     Downloading     Analyzing     Images     Previewing     Uploads     System Tests     Integration Tests     Other Cloud Services    

WebSockets (Action Cable)

Terminology     Server-Side     Client-Side     Streams     Broadcasting     Subscriptions     Params & Channels     Re-Broadcasting     Examples     Configuration     Standalone Cable Servers     Dependencies     Deployment     Testing    

Internationalization API

Intro     Setup     Localization     API Features     Custom Translations     Custom Setup     Translating Model Content    

Testing

Setup     Test Environment     Minitest     Assertions     Assertions (Rails-specific)     Test Cases     Test Runner     Parallel Testing     Test DB     Model Tests     System Tests     Integration Tests     Controller Tests     Router Tests     View Tests     Helper Tests     Email Tests     Background Job Tests     Websocket Tests     Resources    

Security

Sessions     CSRF     Redirection & Files     Intranets & Admin     User Management     Injection     Unsafe Queries     Headers     Custom Credentials     Dependencies     Resources    

Configuration

Code Locations     Code before Rails     General Options     Assets     Generators     Middleware     I18N     Models     Active Record     Controllers     Dispatchers     Views     Email     Active Support     Background Jobs     Websockets     File Attachments     Defaults     Databases     Connections     Environments     Relative Root URLs     Rails Environments     Initializers     Initialization Events     DB Pools     Custom Configs     SEO     File System Monitor    

CLI (command line)

new     server     generate     console     dbconsole     runner     destroy     about     assets     db     notes     routes     test     tmp     miscellaneous     custom rake tasks     advanced topics    

Asset Pipeline

Features     Fingerprinting     How to Use     Development Topics     Production Topics     Customization     Caches     Assets & Gems     Making a Preprocessor    

Autoloading & Reloading Constants (Zeitwerk mode (Rails 6+))

Intro     Enabling     Structure     Autoload Paths     $LOAD_PATH     Reloading     Eager Loading     Single Table Inheritance (STI)     Inflections     Troubleshooting     Rails.autoloaders     Vs Classic Mode    

Caching

Basic Techniques     Storage Options     Keys     Conditional GET     Development Topics     References    

API-only Applications

Definition     Why Rails?     Setup     Middleware     Controller Modules    

Rails from Scratch (Hartl)

ch01     ch02     dynamic pages     ch03     repo setup     static pages     testing (adv)     testing     ch04     classes     helpers     stylesheets     asset pipeline     bootstrap CSS     layouts     links & routes     ch05     signups     ch06     secure passwords     user models     user validation     byebug     debugging     gravatars     ch07     postgresql     puma server     signup failures     signup form     signup ok     ssl     user resources     login actions     login sessions     logout     ch08     ch09     heroku maintain mode     remember checkbox     remember me     remember tests     ch10     user authorization     user delete     user pagination     user updates     ch11     activations     activation email     activation resource     activation (sendgrid)     ch12     password reset     password reset email     password reset resource     ch13     micropost model     micropost show     active storage     images-s3-aws     micropost protofeed     micropost destroy     conclusion     ch14     following-ui     relations    

Various resources

Ruby Std Library v3.0.2     Awesome Ruby (GitHub)     Awesome Rails (Github)     Hacker News mentions     RubyGems home     Ruby Toolbox