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File Open Modes

Mode |  Meaning
-----+--------------------------------------------------------
"r"  |  Read-only, starts at beginning of file  (default mode).
-----+--------------------------------------------------------
"r+" |  Read-write, starts at beginning of file.
-----+--------------------------------------------------------
"w"  |  Write-only, truncates existing file

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Because node gets updated when updating homebrew or installing a brew, and it can cause issues with yarn. One example of the error at the bottom.

Node version 10 works with this issue of node-sass 17 and 16 had issues.

$ node -v
$ brew unlink node
$ brew install node@10
$ brew link --overwrite node@10

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Base64 Info

Encode PDF and Write PDF

base64_data = Base64.encode64(File.open('/Users/covard/Documents/dummy.pdf').read)

file = File.open('/Users/covard/Desktop/test.pdf', 'wb')

file.write(Base64.decode64(base64_data))

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PS Command

DarkLord™ - 🔥 ~ 🔥 $ ps -A | ag [f]irefox | awk '{print $1 " "  $4}'
80258 /Applications/Firefox.app/Contents/MacOS/firefox
80280 /Applications/Firefox.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container
80295 /Applications/Firefox.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container
80305 /Applications/Firefox.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container
80306 /Applications/Firefox.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container

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Rails, MySQL, and JSON

---

Query a JSON attribute / column

Given a model named Preference and that model has a json column named settings.

example data

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VIM Tips

Pasting into VIM/VI

before pasting

:set paste

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Sidekiq

---

Retries

Get Error Message

retries = Sidekiq::RetrySet.new

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MySQL Gem Install error

If this error keeps happening and will not install by manually installing gem install mysql2. Try the fix below.

An error occurred while installing mysql2 (0.5.1) , and bundler cannot continue.

Fix

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Grep

How to grep for text in a dir

$ grep -Ril "was not sent an invitation" /Users/me/src/cool_app/app/

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Array Group By Same Value

2.7.1 :001 > [1, 2, 3, 4, 5, 6, 6, 5, 7, 8, 9, 0].group_by(&:itself).map { |k, v| [k, v.count] }.to_h
=> {1=>1, 2=>1, 3=>1, 4=>1, 5=>2, 6=>2, 7=>1, 8=>1, 9=>1, 0=>1}