RubyConf TH 2023

ruby notes

Component Driven UI with ViewComponent gem [Radoslav Stankov]

https://rstankov.com/appearances - Slides

  • Made Angry Building
  • Product Hunt uses React - GraphQL - Ruby stack
  • Rails is good, but app/helpers ?
  • ViewComponent gem
    • Create reusable, testable, and encapsulated view components
render MessageComponent.new(name: "World")
# or
component :message, name: "World"
  • Preview components (like Storybook)
  • Use ViewComponent to DRY, not for replace plain html or pure functions.
  • Slots for nesting components : renders_one & renders_many
  • fetch_with_fallback to handle fetch errors
  • Have before_render lifecycle method
  • PageHeader component
    • Breadcrumbs
    • Action buttons
  • Yield data back by using Rails’ helpers.content_for
  • Render table results with component & slots
  • Button components

Learn to delegate; like a boss [Elle Meredith, Lachlan Hardy]

  • Storytelling about Jack, sr dev turned eng. manager
  • Delegation is…
    • Designating responsibility to someone else
    • An essential time management and team development strategy
    • Entrusting our authority to others… while remaining accountable for the outcome
  • Thoughts e.g.
    • I feel bad about giving them more work
    • I’ll do the best job here, so I’ll do it myself
    • I don’t have time to teach others
    • I don’t know how to let go!
  • Need mindset shift, learn to delegate
  • Delegation is important
    • Higher revenue (33%)
    • Empowering employees
  • For leader
    • Reduce burnout risks
    • Free up time
    • Deepen relationship & trust
  • For team
    • Increased motivation engagement, productivity
    • Growing skill
  • For […]
  • Autonomy vs Micromanagement
  • Delegation != Abdication
  • “Make yourself obsolete”
  • Agree on DQR: Deadline/Quality/Reporting
  • Learning how to lead, without being in control

Error 418 - I’m a teapot [Matthew Lindfield Seager]

  • 1st April curses
  • HTCPCP (CP^2)
    • Request GET,POST -> WHEN,BREW
    • Responses
      • 406 Not Acceptable
      • 418 I’m a teapot
  • Use Rack to build one in Ruby

Big Corps, Big Worries. Some points on selling Ruby to Big Corps. [Chakrit Wichian]

  • https://www.sawaddee.com
  • “Ruby is Dead”
    • So what?
    • Ruby is Stable/mature
    • Java has some sayings
  • “Ruby does not scale”
    • If your code on GitHub?
    • Have you ever buy from Shopify?
    • Did you book on AirBnB?
  • “Ruby devs are expensive” / “Ruby devs are hard to find”
    • They are developers with “inflated skill”
    • Ruby Devs > Corp Devs
    • Much higher ROI

Data Indexing with RGB (Ruby, Graphs & Bitmaps) [Benji Lewis]

(Previously talked in RubyConf Houston 2022)

  • MeasureStore - Store measures
  • Cross market analysis
  • Cross comparison
  • Harmonization
  • Bitmap Store
  • Store on Redis

Keynote: Breaking Barriers — Empowering the Unbanked with Innovative Tech [Bernard Banta]

  • https://rubycommunity.africa
  • Understanding the challenges in unbanked people (~1.4B over the world)
    • Feature phones, low-end smartphones
  • USSD (Unstructured Supplementary Service Data) via SMS
    • USSD App for feature phones

A Beginner’s Complete Guide to Microcontroller Programming with Ruby [Hitoshi Hasumi]

  • PicoRuby - Wins Fukuoka Ruby Award
  • Uses Raspberry Pi Pico (RP2040 chip)
  • R2P2: PicoRuby shell - github.com/picoruby/R2P2
  • GPIO class
  • ADC - Temperature (built-in in RP2040, or use discrete parts like thermistor)
  • PRK - Keyboard firmware
  • irb
  • runs ruby file
  • Drag file and drop within the mounted R2P2 drive when connected to its USB
  • /home/app.rb runs on startup

Avoiding Disaster: Practical Strategies for Error Handling [Huy Du]

  • Programming is f(x) = y
  • Unexpected Error
  • Exception in Ruby
    • Type e.class
    • Message e.message
    • Backtrace e.backtrace
  • Create Business Logic layer between application’s Controller and Model
  • Return Monad as a result for better reusability
    • Monad is a structure that wraps return result of function in monadic way
  • e.g. Simple monad is a struct with :successful?, :results, :errors, etc.
  • Change business logic to Service Object
  • Monadic handling by using Monad Result to manage the flow of execution

Event Streaming Patterns for Ruby Services [Brad Urani]

  • ProCore, IPO’d
  • Streaming Platform
  • Big Rails app (monolith)
  • How do we break it up? and ensure end-to-end “consistency”
  • Postgres -> AI, Snowflake, Elasticsearch, other services’ Postgres
  • Rails —POST-> Rails : is this consistent?
  • gRPC?
  • vs Amazon Kinesis, Google Cloud Pub/Sub, Sidekiq, RMQ, SQS
  • Kafka
    • Producer —topic-> Consumer
  • Kafka features
    • At-least-once delivery (Consistent)
    • Guaranteed Ordering (Consistent)
    • Multi-cast (Democratized)
    • Durable / Replay-able (Decoupled, High availability)
  • Rails —Kafka-> Rails
  • Managed Kafka
    • Amazon MSK
    • Heroku
    • Confluent Cloud
  • Karafka gem (uses librdkafka)
  • Problem is data in Kafka must be consistent with app’s database
    • Dual Write Problem
      • Also the same problem with Sidekiq
    • Solution, btw complicated - Use database Change Data Capture
    • Pg + Debezium on Kafka Connect
      • Schema leaking
    • Transactional Outbox (separated outbox table) with Change Data Capture
    • Event Sourcing (Log first then insert db with consumer)
      • Asynchronous
      • CQRS
      • Hard for startups
  • Idempotency
    • You may get message twice (e.g. Insert x 2, Delete x 2)
  • Dead letter queue
    • Don’t recommended on most use cases
      • It broke guaranteed order
  • Use cases
    • New user signup
      • Kafka multicasts to Email, Search, and Suggestion services
    • Kafka Connect - Java
    • Data lake - into S3 buckets
    • Materialized Views
      • Consumers populate db views for Rails app to query
    • Region to Region replication
      • MirrorMaker
  • Data structure
    • JSON
    • Protobuf
    • Apache Avro
  • Article
    • What Every Software Enigneer Should mlnw near realtime data’s […]

The Art of Abstracting: Key Factors for Success in a Core/Platform/BuildingBlocks team [Omar Sotillo Franco]

(The presenter is absent, gws!)

Panel discussion [Various panelists]

  • What are effective ways to support junior devs in the Ruby community?
  • How do you foresee generative AI impacting the future of programming?
  • How can Ruby devs avoid burnout and maintain a sustainable work-life balance?
    • Exercise
  • What tips or advice would you offer to people looking to present at Ruby or tech conf?
    • Start small & simple (eg. lightning talks at smaller conf)
    • few takeaways, focus on core messages
    • practice
    • ppl love live demos (high risk btw)
    • Be clear on abstract/message on submitting CFPs to get the talk accepted
    • https://speakerline.io

Kickboxer vs Ruby - the state of MRuby, JRuby and CRuby [Michael Milewski, Selena Small]

  • Actuator (mRuby)
    • ESP32 with mruby
    • ESP-IDF
    • mqtt client
  • Server (cRuby)
    • mqtt
    • mosquitto
  • Mobile app
    • Tried many solutions
      • jRuby -> Ruboto -> RubyMotion -> jruby on iSH terminal -> Rubyist -> Termux -> jruby on raspi -> ruboto+arduino ✅

Passkeys

  • a replacement for password
  • public/private keypair
  • use with biometrics github.com/ruby-passkeys

Rails Performance Monitoring 101: A Primer for Developers [Rishi Jain]

  • Misconceptions
    • Cache = Fast
    • Bigger hardware = Fast
  • APM - Application Performance Monitoring
    • NewRelic
    • DagaDog
    • Scout
    • AppSignal
    • etc.
  • Common mistakes
    • N+1 queries
      • #count vs #size
      • #where vs #find
      • Convert queries to has_one then eager load it
      • rack-mini-profiler, Bullet
    • Lack of background jobs
    • Timeout from 3rd party services
    • Missing db indices
      • Query with #explain, see the query plan
        • Seq Scan is slow (should be Index Scan)
    • The order of compound db index
    • SQL performance explained

Keynote: Thriving in Uncertainty [Ben Halpern]

  • https://dev.to
  • https://isrubydead.com
  • Specialists thrive in kind environment
  • Generalists thrive in wicked environment
    • Adaptability
    • Higher-order Thinking
    • Problem Reformulation - reframing
    • Collaboration & Communication
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