Martian Chronicles, Evil Martians’ team blog 03 Oct 2022
RubyKaigi 2022: a report from an Evil Martian in Japan
Authors: Sampo Kuokkanen, Head of Evil Martians Japan, and Travis Turner, Tech EditorTopics: Events, Backend Development, Ruby on Rails, Ruby
For Evil Martians' Japanese office, the annual RubyKaigi conference was the perfect chance to meet up with the local Ruby community.
Do you know RubyKaigi? RubyKaigi 2022 was recently held in Tsu, Japan, and the entire Evil Martians Japanese office team attended the conference in person. This article is both a first-timer's report from this awesome Ruby event and is also your chance to get a taste of what the far-east lifestyle is like for Martians engineers!
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![# Part 1/3: How to create an enum type for an Active Record Model def up create_enum :user_status, ["pending", "active", "archived"] # creating enum type create_table :users, force: true do |t| t.enum :status, enum_type: "user_status", default: "pending", null: false end end def down drop_table :users execute <<-SQL DROP TYPE user_status; SQL end # This is how the model might look like when using standard Rails class User < ActiveRecord::Base enum status: { pending: 'pending', active: 'active', }, _prefix: true end # the following queries will work User.status_pending.count user.status_pending?](https://substackcdn.com/image/fetch/f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fbucketeer-e05bbc84-baa3-437e-9518-adb32be77984.s3.amazonaws.com%2Fpublic%2Fimages%2F3f6e6965-f42e-4610-9055-1e8647493106_1406x1252.png "# Part 1/3: How to create an enum type for an Active Record Model def up create_enum :user_status, [\"pending\", \"active\", \"archived\"] # creating enum type create_table :users, force: true do |t| t.enum :status, enum_type: \"user_status\", default: \"pending\", null: false end end def down drop_table :users execute <<-SQL DROP TYPE user_status; SQL end # This is how the model might look like when using standard Rails class User < ActiveRecord::Base enum status: { pending: 'pending', active: 'active', }, _prefix: true end # the following queries will work User.status_pending.count user.status_pending?")
![# Part 3️⃣/4: Other ways to call a method # with __send__ service.__send__(:post, "Extra #1!") # Using [] shorthand syntax for call service.method(:post)["Extra #2!"] # With lambda service.tap(&->(object) { object.post("Extra #3!")}) # or post_lambda = ->(service) { service.post("Extra #4!")} service.tap(&post_lambda) # With proc service.tap(&(Proc.new { _1.post("Extra #5!")})) # or post_proc = Proc.new { _1.post("Extra #6!")} service.tap(&post_proc) # It works with `then` too if you want to get the result also # `tap` will discard the result result = service.then { _1.post("Extra #7!") }](https://substackcdn.com/image/fetch/f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fbucketeer-e05bbc84-baa3-437e-9518-adb32be77984.s3.amazonaws.com%2Fpublic%2Fimages%2Fd9a742d6-a113-4ebe-96ad-cf5b029963f2_1428x1020.png "# Part 3️⃣/4: Other ways to call a method # with __send__ service.__send__(:post, \"Extra #1!\") # Using [] shorthand syntax for call service.method(:post)[\"Extra #2!\"] # With lambda service.tap(&->(object) { object.post(\"Extra #3!\")}) # or post_lambda = ->(service) { service.post(\"Extra #4!\")} service.tap(&post_lambda) # With proc service.tap(&(Proc.new { _1.post(\"Extra #5!\")})) # or post_proc = Proc.new { _1.post(\"Extra #6!\")} service.tap(&post_proc) # It works with `then` too if you want to get the result also # `tap` will discard the result result = service.then { _1.post(\"Extra #7!\") }")
![# Part 4️⃣/4: using bind and binding method = TweetService.instance_method(:post) method.bind(service).call("Extra #8!") # with bind, you can change the context where this executes class ClientOauthV2 def send(message) = puts "[OauthV2] #{message}" end class TweetServiceV2 < TweetService def initialize(client = ClientOauthV2.new) = super end new_service = TweetServiceV2.new method.bind(new_service).call("Extra #9!") # You can also get binding and then eval in that context class TweetServiceV2 < TweetService def get_binding = binding end context = new_service.get_binding context.eval("post('Extra #10!')") # or eval("post('Extra #11!')", context)](https://substackcdn.com/image/fetch/f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fbucketeer-e05bbc84-baa3-437e-9518-adb32be77984.s3.amazonaws.com%2Fpublic%2Fimages%2F7b968dcd-3a6b-4eaf-b1c1-c19abfc48957_1432x1132.png "# Part 4️⃣/4: using bind and binding method = TweetService.instance_method(:post) method.bind(service).call(\"Extra #8!\") # with bind, you can change the context where this executes class ClientOauthV2 def send(message) = puts \"[OauthV2] #{message}\" end class TweetServiceV2 < TweetService def initialize(client = ClientOauthV2.new) = super end new_service = TweetServiceV2.new method.bind(new_service).call(\"Extra #9!\") # You can also get binding and then eval in that context class TweetServiceV2 < TweetService def get_binding = binding end context = new_service.get_binding context.eval(\"post('Extra #10!')\") # or eval(\"post('Extra #11!')\", context)")
A painting by my mother, Yelena Liberman, "Ukraine - Today, Tomorrow, and Always!"
![# Code Summary for https://thoughtbot.com/blog/value-object-semantics-in-ruby # Part 2/4 : Value objects # 1. Should == each other # 2. Should NOT #equal? each other (as equal? should compare by identity) # 3. Should #hash to the same value # 4. Should #eql? each other (Ruby expects objects that have them same hash to be eql?) class Duration attr_reader :minutes def initialize(minutes) = @minutes = minutes def ==(other) = minutes == other.minutes alias_method :eql?, :== def hash = [self.class, minutes].hash end # #hash and #eql? are importyant as it allows the value object to be used as hash key events = { Duration.new(5) => [ 1, 2, 3], Duration.new(10) => [5, 6, 7] } events[Duration.new(5)] # will return [1, 2, 3] # Struct objects are compared by value by default Duration = Struct.new(:minutes) Duration.new(5) == Duration.new(5)](https://substackcdn.com/image/fetch/f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fbucketeer-e05bbc84-baa3-437e-9518-adb32be77984.s3.amazonaws.com%2Fpublic%2Fimages%2F04fcc227-4ff0-44dc-8fea-2be5bea1fdf5_1358x1294.png "# Code Summary for https://thoughtbot.com/blog/value-object-semantics-in-ruby # Part 2/4 : Value objects # 1. Should == each other # 2. Should NOT #equal? each other (as equal? should compare by identity) # 3. Should #hash to the same value # 4. Should #eql? each other (Ruby expects objects that have them same hash to be eql?) class Duration attr_reader :minutes def initialize(minutes) = @minutes = minutes def ==(other) = minutes == other.minutes alias_method :eql?, :== def hash = [self.class, minutes].hash end # #hash and #eql? are importyant as it allows the value object to be used as hash key events = { Duration.new(5) => [ 1, 2, 3], Duration.new(10) => [5, 6, 7] } events[Duration.new(5)] # will return [1, 2, 3] # Struct objects are compared by value by default Duration = Struct.new(:minutes) Duration.new(5) == Duration.new(5)")
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