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Ruby: blocks, procs, lambdas, symbols, metaprogramming, modules dan mixins
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Arsitektur Rails: pola MVC, config/routes.rb, autoloading, Zeitwerk
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Active Record: models, associations (has_many, belongs_to, has_and_belongs_to_many)
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Validasi AR: presence, uniqueness, validator kustom, konteks validasi
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Callbacks AR: before_save, after_create, around_update, lifecycle hooks
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Migrations: create_table, add_column, change_column, rollback, schema.rb
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Routing: resources, nested routes, namespaces, constraints, route helpers
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Controllers: params, strong parameters, filters (before_action), respond_to
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Views: template ERB, partials, helpers, layouts, content_for/yield
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Active Record Query: where, joins, includes, preload, eager_load (pencegahan N+1)
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Rails API mode: aplikasi API-only, serializers (ActiveModel::Serializers, jbuilder)
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Autentikasi: Devise gem, has_secure_password, manajemen sesi, cookies
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Otorisasi: Pundit gem, CanCanCan, policies, kontrol akses berbasis peran
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Action Cable: channels, streams, broadcasting, koneksi WebSocket
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Active Job: perform_later, queue adapters (Sidekiq), prioritas job, retry logic
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Active Storage: attachments (has_one_attached, has_many_attached), variants, direct uploads
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Pengujian: RSpec (describe, context, it), FactoryBot, fixtures, request specs, system tests
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Concerns: ActiveSupport::Concern, penggunaan ulang kode, komposisi modul
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Rails engines: mountable engines, namespacing, pengembangan gem
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Performa: fragment caching, Russian doll caching, optimisasi query, bullet gem
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Keamanan: perlindungan CSRF, pencegahan SQL injection, perlindungan mass assignment (strong params)
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Deployment: Capistrano, Heroku, Docker, server Puma/Unicorn, assets pipeline