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Full Stack Developer with a degree in Computer Engineering.

Gilberto Oliveira Jr giljr

💭
Full Stack Developer with a degree in Computer Engineering.
45 followers · 8 following
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@giljr
giljr / rack_vs_selenium_diover.md
Created November 30, 2025 17:33
Cucumber + RSpec: Testes que Falam e Testes que Garantem Da especificação ao teste automatizado sem fricção
Recurso Suportado? Explicação
Execução ultra rápida ✔️ Sem abrir navegador
HTML e navegação ✔️ visit, fill_in, have_content funcionam
JavaScript / AJAX ❌ Não executa nenhum JS
Webpack, importmaps, Stimulus ❌ Nada JS roda
Upload de arquivo ✔️ Limitado, mas funciona
Interação DOM real ✔️ Mas estático, sem JS
@giljr
giljr / how_capybara_choose_works.md
Created November 25, 2025 21:14
https://medium.com/jungletronics/rspec-q-a-4e3ff5dea259
Capybara call How it finds the radio
choose('smoker_s') by the radio button’s id
choose('Sim') by the label’s visible text
@giljr
giljr / rails_validators.md
Last active November 22, 2025 20:34
Rails Model Validation Best Practices (Full Guide) Your complete, professional, Rails-grade guide to Model Validation Best Practices

The Default Rails Validators:

             validates :attribute, validator_name: options

You can memorize the core validators in 10 seconds:

Validator Purpose Example
presence: must not be blank presence: true
absence: must be blank absence: true
@giljr
giljr / better_reset_db.md
Created November 22, 2025 15:05
Is running rails db:drop db:create db:migrate the correct approach?
Command Action When to Use
rails db:reset Rebuild DB using schema.rb Faster, recommended for development
rails db:setup Create DB, load schema, seed When setting up a new project
rails db:drop db:create db:migrate Rebuild DB running migrations When testing migrations
@giljr
giljr / static_vs_dinamic_analyzers.md
Created November 4, 2025 16:52
Static & Dynamic Analyzers

🔍 Comparison

Type of Analysis When It Happens Examples
Static Before execution RuboCop, Brakeman, RubyCritic, bundler-audit, flake8 (Python)
Dynamic / Runtime During execution RSpec, Minitest, SimpleCov, pytest, valgrind
@giljr
giljr / ast_structure.md
Created November 2, 2025 13:47
Static vs. Dynamic Code Analysis: How RuboCop Reads Ruby's Mind
Node Meaning Example
sbegin sequence of expressions top-level script
lvasgn local variable assignment name = ...
str simple string "Gilberto"
dstr dynamic string (with interpolation) "Hello, #{name}"
send method call puts ...
@giljr
giljr / dynamic_vs_satic_analyzers.md
Created November 2, 2025 13:34
Type When It Runs Example Tools What It Detects
Static Analysis Before execution RuboCop (Ruby), ESLint (JS), pylint (Python) Style issues, unused variables, bad practices, security smells
Dynamic Analysis While the program runs RSpec, pytest, valgrind Runtime errors, memory leaks, logic bugs
@giljr
giljr / xe_vs_xepdb1.md
Created November 1, 2025 22:50
Oracle OCI8 - Complete Guide(2025)
Connect To Type Use Case Rails-compatible
XE Container (CDB$ROOT) Admin / system-level ❌
XEPDB1 Pluggable Database (PDB) App data, user schemas ✅
@giljr
giljr / three_zips_needed_oci8.md
Created November 1, 2025 21:25
Oracle OCI8 - Complete Guide(2025)
File Description Direct label on page
instantclient-basic-linux.x64-21.13.zip Runtime libraries (required) “Basic Package (ZIP)”
instantclient-sdk-linux.x64-21.13.zip Header files for compiling ruby-oci8 “SDK Package (ZIP)”
instantclient-sqlplus-linux.x64-21.13.zip SQL*Plus CLI for testing “SQL*Plus Package (ZIP)”
@giljr
giljr / rails-tmux-vim-cheatsheet.md
Created October 31, 2025 12:44
https://medium.com/jungletronics/mastering-rspec-setup-vim-cleanup-for-ruby-projects-e64e3e85ceba

Rails + Tmux + Vim Quick Commands

Sym Command Description
🆕 tmux new -t rails Create and attach a new tmux session named rails
⬆️ vim Gemfile Open the Gemfile using Vim
⬇️ :tabe spec/rails_helper.rb Open Rails configuration file in a new Vim tab
⬇️ :tabe spec/rspec_helper.rb Open RSpec configuration file in a new Vim tab
⌨️ gt Switch between open Vim tabs
⌨️ Ctrl + b, then Ctrl + Shift + % Split tmux window into right panel (side-by-side)
⌨️ Ctrl + b → → Move focus to the **rig