# Check if cache exists
Rails.cache.exist?('latest_posts')

# Read the current cached value
Rails.cache.read('latest_posts')

# Delete the cache if needed
Rails.cache.delete('latest_posts')

ActiveRecord::Base.connection_db_config.name

Car.connection_db_config.name
Vehicle.connection_db_config.name

SELECT 
   (blocks_done::numeric / blocks_total::numeric) * 100 AS percentage_done
FROM     
   pg_stat_progress_create_index;

Streaming

class MyController < ActionController::Base
  include ActionController::Live

  def stream
    response.headers['Content-Type'] = 'text/event-stream'
    100.times {
      response.stream.write "hello world\n"
      sleep 1
    }
  ensure
    response.stream.close
  end
end

Server Sent Events

class MyController < ActionController::Base
  include ActionController::Live

  def index
    response.headers['Content-Type'] = 'text/event-stream'
    sse = SSE.new(response.stream, retry: 300, event: "event-name")
    sse.write({ name: 'John'})
    sse.write({ name: 'John'}, id: 10)
    sse.write({ name: 'John'}, id: 10, event: "other-event")
    sse.write({ name: 'John'}, id: 10, event: "other-event", retry: 500)
  ensure
    sse.close
  end
end

• <% %>: Executes the Ruby code within the brackets but does not print the result to the template.
• <%= %>: Executes the Ruby code and prints the result to the template, with HTML escaping.
• <%== %>: Executes the Ruby code and prints the result to the template without HTML escaping.

irb(main):001> ["a", "b"] | ["b", "c"]
=> ["a", "b", "c"]

def change
  change_column_default :blog, :language, "en_US"
end

Caused by:
ActiveRecord::IrreversibleMigration:

change_column_default is only reversible if given a :from and :to optio

def change
  change_column_default :blog, :language, from: "en", to: "en_US"
end

SQL unaccent is a PostgreSQL extension that removes accents (diacritic signs) from lexemes. It is a filtering dictionary that can be used to improve user experience and implement search in a user-friendly way. The unaccent() function removes accents from a given string and can be used outside normal text search contexts. For example, SELECT unaccent('unaccent', 'Hôtel') returns 'hotel'. The unaccent extension provides a single function, unaccent(), which can be used to remove accents from words. It can even be indexed using an unaccent-based index to speed up the process.

Returns the number of mandatory arguments.
If the block is declared to take no arguments, returns 0.
If the block is known to take exactly n arguments, returns n.
If the block has optional arguments, returns -n-1

https://apidock.com/ruby/Proc/arity

today = new Date()
Thu May 05 2022 19:28:34 GMT+0530 (India Standard Time)
today.getMonth()
4

Gem::Version.new('1.0.1') > Gem::Version.new('1.0.0')

defaults write com.apple.screencapture location {location here}

defaults write com.apple.screencapture location /Users/rinas/Desktop/Screenshots

heroku run rails c -a APP_NAME

redirect_to url and return

Page.where.not(custom_domain: nil).pluck(:custom_domain)

Page.pluck(:custom_domain)

Page.pluck(:custom_domain).compact

.turbo-progress-bar {
  background-color: black;
}

rvm --default use 3.1.0

console.log('%c hey red text', 'color: red')
console.log('%c hey green text', 'color: green')