One engineer company with Ruby on Rails

Video: https://www.youtube.com/watch?v=lUM4KIrsaQo&list=PLAkGYJoUfB0s1x8AcxBlnpnKFOPblEkRa&index=11

Transcript

1. One engineer company with Ruby on Rails Radoslav Stankov
2. !
3. Radoslav Stankov @rstankov rstankov.com
4. https://tips.rstankov.com
7. " Side project
13. What is the most scary thing for a developer? #
14. ☕ coffee machine not working What is the most scary thing for a developer? #
15. ☕ coffee machine not working % unreproducible bug What is the most scary thing for a developer? #
16. ☕ coffee machine not working % unreproducible bug & PM saying change should be easy! What is the most scary thing for a developer? #
17. ☕ coffee machine not working % unreproducible bug & PM saying change should be easy! ☎ someone calling on the phone What is the most scary thing for a developer? #
18. ☕ coffee machine not working % unreproducible bug & PM saying change should be easy! ☎ someone calling on the phone What is the most scary thing for a developer? #
19. What is the most scary thing for a developer? # ☎ (
24. Business
25. ) Default: ALIVE ✅ 0 churn + 500% growth YoY , Self-sustaining business
28. Product-market fit is the point at which you have identified the best target industries, buyers and use cases for your product. Sales become repeatable and scalable. - Product-Market Fit
29. Product-market fit is the point at which you have identified the best target industries, buyers and use cases for your product. Sales become repeatable and scalable. - Product-Market Fit
30. You will likely have to split your main market into many segments and focus on them individually.
 So, the product-market fit will be a continuum of discovering a repeatable sales process for each segment. - Product-Market Fit
36. . Competitors Pen & Paper Excel ProPMS PMPro
37. / Product journey
38. ❌ Started with individual facility managers (B2C) / Product journey
39. ❌ Started with individual facility managers (B2C) 1 Pivoted to facility management companies (B2B) / Product journey
40. ❌ Started with individual facility managers (B2C) 1 Pivoted to facility management companies (B2B) 2 Non consumption companies / Product journey
41. Pen & Paper Excel ProPMS PMPro Consumption Non consumption
42. ❌ Started with individual facility managers (B2C) 1 Pivoted to facility management companies (B2B) 2 Non consumption companies 3 Construction companies / Product journey
43. ❌ Started with individual facility managers (B2C) 1 Pivoted to facility management companies (B2B) 2 Non consumption companies 3 Construction companies 4 Complex buildings / Product journey
44. ❌ Started with individual facility managers (B2C) 1 Pivoted to facility management companies (B2B) 2 Non consumption companies 3 Construction companies 4 Complex buildings 5 New facility management companies / Product journey
45. ❌ Started with individual facility managers (B2C) 1 Pivoted to facility management companies (B2B) 2 Non consumption companies 3 Construction companies 4 Complex buildings 5 New facility management companies ⏫ Target competitors / Product journey
46. ❌ Started with individual facility managers (B2C) 1 Pivoted to facility management companies (B2B) 2 Non consumption companies 3 Construction companies 4 Complex buildings 5 New facility management companies ⏫ Target competitors 7 Growing companies / Product journey
47. ❌ Started with individual facility managers (B2C) 1 Pivoted to facility management companies (B2B) 2 Non consumption companies 3 Construction companies 4 Complex buildings 5 New facility management companies ⏫ Target competitors 7 Growing companies 8 Stable companies 9 / Product journey
48. ❌ Wrong names in database tables ❌ Too traditional User model ❌ Started with individual facility managers (B2C) ❌ Kicking off a service marketplace on top of mobile app ❌ Trying to expand to Spain ❌ Mistakes
50. : Rado's tips
51. : Rado's tips "Find one customer and build around them. Target non-consumption first. Then, find more customers like them."
52. "As a developer, be involved in sales, support, and onboarding of each new category of customers." : Rado's tips
53. "Know the reasons why someone will not use your product. Eliminate those reasons -" : Rado's tips
54. "Get problems from customers and sales. Don't get the solutions." : Rado's tips
56. "Build an intuition about what generic and special cases are in your product." : Rado's tips
58. module SpecialCases extend self ACCOUNT_CUSTOMER1 = 1 ACCOUNT_CUSTOMER2 = 2 ACCOUNT_CUSTOMER3 = 3 def disable_payment_document?(payment) # ... end def receipt_for_deposit_payments?(payment) # ... end def invoice_prefix(account) # ... end def receipt_prefix(account) # ... end def invoice_numbering_changed?(account) # ... end def proforma_title(account)
62. ; What to work on next?
63. ; What to work on next? < Reduce churn = Bring more customers > Reduce support load ? Quality of life - for customers, for me (DX)
64. ; What to work on next? @ Fast track % Critical bugs ☀ 10 minute features or fixes
65. ; What to work on next? B Friday (dedicated 2~3h) C Fix exceptions / bugs D Bump dependancies E Pay tech depth
66. ; What to work on next? < Reduce churn = Bring more customers > Reduce support load ? Quality of life - for customers, for me (DX) @ Fast track % Critical bugs ☀ 10 minute features or fixes B Friday (dedicated 2~3h) C Fix exceptions / bugs D Bump dependancies E Pay tech depth
67. F Friday all-hands (петъчната оперативка G) • Every Friday afternoon (~2-4h) • Keep company in sync and make decisions • Set goal for next week • Required for everybody • Share company CORE and HEALTH metrics • Share progress of product and support • Support shares common issues • Discussion on major issues • What surprises we encountered • What are the biggest blockers we are facing • sometime brainstorm
69. Technology
70. - one developer (me) H - management portal I - implement a mobile app J - for iOS K / Android L
71. Building mapping M Mobile app J Issue tracker C Employees N Bulletin board ; Notifications O Taxation E Contacts P Omni search Q Reporting R Printing S Bookkeeping T Voting U Financials V Homebook W Debtors X Bulk operations ⚙ Messaging Z Calendar [ Funds \ ePay / EasyPay ] Bank imports ^ Invoicing _ Warranty Issues `
 Technicians D
 Individual accounts a Business accounts M Audit logs /
 Archiving b Trials c Demo d
 I18n G e f
 Marketing site g
72. I Web stack h
73. J Mobile stack h
75. https://speakerdeck.com/rstankov/react-mid-game
78. i Domain
79. 563 routes on web 26 screens on mobile app 105 active record models 2176 tests, running for ~3 minutes 3 languages - bg G en f es e I Code metrics
81. source: https://refactoring.fm/p/how-to-choose-technology
82. j Make common operations easy k Reduce indirection l Use as much vanilla Rails as possible m Have good e2e test coverage n Avoid writing JavaScript and CSS o Internationalize from day 0
85. gem 'annotate' # == Schema Information # # Table name: buildings_print_templates # # id :bigint(8) not null, primary key # format :string not null # name :string not null # options :jsonb not null # created_at :datetime not null # updated_at :datetime not null # account_id :bigint(8) not null # user_id :bigint(8) # # Indexes # # index_buildings_print_templates_on_account_id_and_name (account_id,name) UNIQUE # index_buildings_print_templates_on_user_id (user_id) # # Foreign Keys # # fk_rails_... (account_id => accounts.id) # fk_rails_... (user_id => users.id) # class Buildings::PrintTemplate < ApplicationRecord
86. gem 'counter_culture' class Apartment < ApplicationRecord belongs :building # will track active and archived apartments separately counter_culture :building, column_name: -> { _1.active? ? :apartments_count : :archived_apartments_count } # can do this for the whole account counter_culture %i(building account), column_name: -> { _1.building.active? && _1.active? ? :apartments_count : :arch # can track a sum of a columns counter_culture :building, column_name: :unpaid_taxes_amount, delta_magnitude: -> { _1.unpaid_taxes_amount }
 counter_culture :building, column_name: :deposit_amount, delta_magnitude: -> { _1.deposit_amount } end
87. 3 Objects View Components Policy objects Service objects Form objects Query objects
88. 3 Objects View Components Policy objects Service objects Form objects Query objects
89. <%= render FieldsetComponent.new(fieldset, title: :bank_account) do %> <%= form.input :bank_account_bank %> <%= form.input :bank_account_iban %> <%= form.input :bank_account_bic %> <% end %>
91. https://speakerdeck.com/rstankov/component-driven-ui-with-viewcomponent-gem
92. 3 Objects View Components Policy objects Service objects Form objects Query objects
93. KittyPolicy https://github.com/producthunt/kitty-policy
94. module ApplicationPolicy extend self def can_access_account?(user, account) return false if user.nil? user.admin? || account.member?(user) end end
95. module ApplicationPolicy extend KittyPolicy::DSL can :access, Account do |user, account| user.admin? || account.member?(user) end end # generates ApplicationPolicy.can_access_account?(user, account) # can be accessed as ApplicationPolicy.can?(user, :access, account) ApplicationPolicy.authorize!(user, :access, account) # raise KittyPolicy::AccessDenied
96. module ApplicationPolicy extend KittyPolicy::DSL extend ApplicationPolicy::RolesDSL # Role stacking. # Upper role can do everything lower role can do
 # # - director > supervisor > operator > cashier # - chief technician > technician # - chief accountant > accountant building_cashier_can :view, Withdraw building_operator_can :create, Withdraw building_supervisor_can :update, Withdraw building_director_can :destroy, Withdraw # ... end
97. wc -l < app/lib/application_policy.rb 223
98. class CalendarEventsController < ApplicationController require_account_feature :calendar def show @event = find_record Calendar::Event end def edit @event = find_record Calendar::Event, params[:id], authorize: :manage end
 # ... end
99. class CalendarEventsController < ApplicationController require_account_feature :calendar def show @event = find_record Calendar::Event end def edit @event = find_record Calendar::Event, params[:id], authorize: :manage end
 # ... end
100. class CalendarEventsController < ApplicationController require_account_feature :calendar def show @event = find_record Calendar::Event end def edit @event = find_record Calendar::Event, params[:id], authorize: :manage end
 # ... end
101. render template: 'system/feature_unavailable' end rescue_from KittyPolicy::AccessDenied do |error| ErrorReporting.capture_exception(error) render template: 'system/unauthorized' end end class_methods do def require_account_feature(feature_name) self.required_account_feature = feature_name end end private def find_record(scope, id = :none, authorize: :view) record = scope.find(id == :none ? params[:id] : id) ApplicationPolicy.authorize!(current_user, authorize, record) if self.class.required_account_feature.present? Accounts.feature_available!(record, self.class.required_account_feature) end
102. private def find_record(scope, id = :none, authorize: :view) record = scope.find(id == :none ? params[:id] : id) ApplicationPolicy.authorize!(current_user, authorize, record) if self.class.required_account_feature.present? Accounts.feature_available!(record, self.class.required_account_feature) end record end end
103. module Accounts extend self def account_of(record) if record.is_a?(Account) record elsif record.respond_to?(:account) record.account elsif record.respond_to?(:building) record.building.account else raise "Can't find account for #{record.class}##{record.id}" end end def feature_available?(record, feature_name) account_of(record).features.available?(feature_name) end def feature_available!(record, feature_name) return if feature_available?(record, feature_name) raise FeatureUnavailable.new(record, feature_name) end end
104. 3 Objects View Components Policy objects Service objects Form objects Query objects
105. module Taxation::PaymentCreate extend self def call(arguments) # ... end private # ... end
106. I don't have many "service objects". In most cases, the "service object", I inline it in a "form object".
107. 3 Objects View Components Policy objects Service objects Form objects Query objects
108. MiniForm (Syntax sugar around ActiveModel::Model) https://github.com/RStankov/MiniForm
109. class Calendar::AttendeeForm < ApplicationForm main_model( :attendee, attributes: %i(user_id), read: %i(event building), save: true ) validate :ensure_user_is_allowed def initialize(event) @attendee = event.attendees.new end def user_options @user_options ||= building.account.member_users end def perform Notifications.notify_about(@attendee) end private def ensure_user_is_allowed
110. class ApplicationForm include MiniForm::Model def submit(params) update(params.require(:form).permit(self.class.attribute_names)) end def submit!(params) update!(params.require(:form).permit(self.class.attribute_names)) end end
111. class ApplicationForm include MiniForm::Model def submit(params) update(params.require(:form).permit(self.class.attribute_names)) end def submit!(params) update!(params.require(:form).permit(self.class.attribute_names)) end end module ApplicationHelper def app_form(record, options = {}) options[:as] ||= :form 
 # ... end # ...
112. class CalendarEventAttendeesController < ApplicationController require_account_feature :calendar def new @attendee = Calendar::AttendeeForm.new(find_event) end def create @attendee = Calendar::AttendeeForm.new(find_event) @attendee.submit(params) respond_with @attendee, location: event_path(@attendee.event) end private def find_event find_record Calendar::Event, params[:event_id] end end
113. class CalendarEventAttendeesController < ApplicationController require_account_feature :calendar def new @attendee = Calendar::AttendeeForm.new(find_event) end def create @attendee = Calendar::AttendeeForm.new(find_event) @attendee.submit(params) respond_with @attendee, location: event_path(@attendee.event) end private def find_event find_record Calendar::Event, params[:event_id] end end gem 'responders'
114. I keep business logic in the form object, except if it is going to be used somewhere else. I follow the same logic for ActiveJob objects.
115. 3 Objects View Components Policy objects Service objects Form objects Query objects
117. Search form
118. Search form Statistics based on search
119. Search form Statistics based on search Search results
120. SearchObject https://github.com/RStankov/SearchObject
121. search = Finance::TransactionsSearch.new(filters: params[:filters]) search.results
122. class Finance::TransactionsSearch def initialize(filters: {}) @filters = filters end def results scope = Transaction.all scope = scope.where(user_id: @filters[:user_id]) if @filters[:user_id] scope = scope.where("amount > ?", @filters[:min_amount]) if @filters[:min_amount] scope = scope.where("amount < ?", @filters[:max_amount]) if @filters[:max_amount] scope = scope.where("created_at > ?", @filters[:start_date]) if @filters[:start_d scope = scope.where("created_at < ?", @filters[:end_date]) if @filters[:end_date] scope end end
123. class Finance::TransactionsSearch def initialize(filters: {}, page: 0) @filters = filters @page = page end def results @results ||= fetch_results end def fetch_results scope = Transaction.all scope = scope.where(user_id: @filters[:user_id]) if @filters[:user_id] scope = scope.where("amount > ?", @filters[:min_amount]) if @filters[:min_amount] scope = scope.where("amount < ?", @filters[:max_amount]) if @filters[:max_amount] scope = scope.where("created_at > ?", @filters[:start_date]) if @filters[:start_d scope = scope.where("created_at < ?", @filters[:end_date]) if @filters[:end_date] scope.page(@page) end end
124. class Finance::TransactionsSearch include SearchObject.module(:kaminary) scope { Transaction.all } option(:user_id) option(:min_amount) { |scope, v| scope.where("amount > ?", v) } option(:max_amount) { |scope, v| scope.where("amount < ?", v) } option(:start_date) { |scope, v| scope.where("created_at > ?", v) } option(:end_date) { |scope, v| scope.where("created_at < ?", v) } end
125. class Finance::TransactionsSearch include SearchObject.module(:kaminary) scope { Transaction.all } option :user_id option :min_amount, with: :filter_by_min_amount option :max_amount, with: :filter_by_max_amount option :start_date, with: :filter_by_start_date option :end_date, with: :filter_by_end_date private def filter_by_min_amount(scope, value) scope.where("amount > ?", value) end def filter_by_max_amount(scope, value) scope.where("amount < ?", value) end def filter_by_start_date(scope, value) scope.where("created_at > ?", value) end
126. search = Finance::TransactionsSearch.new(filters: params[:filters]) search.results 
 search.balance
 search.income
 search.expense
 search.count
 
 search.cashier_options search.source_options search.type_options
127. # Where do all those objects live?
128. app/policies app/services app/forms app/queries
130. app/policies app/services app/forms app/queries
131. app/policies app/services app/forms app/queries app/network
132. app/policies app/services app/forms app/queries app/network app/validators
133. app/policies app/services app/forms app/queries app/network app/validators
 app/decorators
134. app/policies app/services app/forms app/queries app/network app/validators
 app/decorators app/presenters
135. app/services app/forms app/queries app/network app/validators
 app/decorators app/presenters app/notifiers
136. app/forms app/queries app/network app/validators
 app/decorators app/presenters app/notifiers app/values
137. app/queries app/network app/validators
 app/decorators app/presenters app/notifiers app/values app/support
138. app/network app/validators
 app/decorators app/presenters app/notifiers app/values app/support app/others
140. put everything in one folder put everything in one folder put every object type in its own folder
141. app/lib
 app/lib/[domain]/*.rb
 app/lib/[domain].rb
142. You only get special folder if you called in special way. Those are the special folders app/components app/controllers app/jobs app/models app/graph app/mailers
145. No JavaScript (1030 lines without any libraries)
146. require 'features_helper' feature 'Feature: Calendar' do scenario 'attendee - create > list > delete' do building = create :building sign_in_operator building account_member = create :account_member, account: building.account event = create :calendar_event, building: building visit event_path(event) click_on I18n.t(:action_new_attendee) # test: validation submit_form expect_form_errors :blank # test: create submit_form!( user_id: account_member.user_id, )
147. submit_form expect_form_errors :blank # test: create submit_form!( user_id: account_member.user_id, ) expect(page).to have_content account_member.name attendee = event.attendees.last! expect(attendee.user).to eq account_member.user # test: destroy click_on_destroy expect_flash_message :destroy expect_to_be_destroyed attendee end end
148. sign_in_operator submit_form submit_form! click_on_destroy expect_form_errors expect_flash_message expect_to_be_destroyed p Custom test helpers
149. https://tips.rstankov.com/p/my-testing-tips
150. Recap