andreleoni

# Cria o objeto
object = { a: 1, b: 2 }
=> {:a=>1, :b=>2} 

# Cria a referência
reference = object
=> {:a=>1, :b=>2} 

# Deleta o objeto da referência
reference.delete(:a)

andreleoni

mkdir ~/.go
echo "GOPATH=$HOME/.go" >> ~/.bashrc
echo "export GOPATH" >> ~/.bashrc
echo "PATH=\$PATH:\$GOPATH/bin # Add GOPATH/bin to PATH for scripting" >> ~/.bashrc
source ~/.bashrc

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ActiveRecord::Base.logger = Logger.new(STDOUT)

andreleoni

git branch --merged | grep -v \* | xargs git branch -D 

andreleoni

annotate --show-indexes --exclude tests,fixtures,factories,serializers --show-foreign-keys

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module WithSelfClass
  class << self
    def my_function
      "Presenter"
    end
  end
end

class MyClassWithSelfClass
  extend WithSelfClass

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-- show running queries (pre 9.2)
SELECT procpid, age(query_start, clock_timestamp()), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(query_start, clock_timestamp()), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

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 ActiveRecord::Base.connection.tables.each do |table|
  indexes = ActiveRecord::Base.connection.indexes(table)
  if indexes.length > 0
    puts "====>  #{table} <===="
    indexes.each do |ind|
      puts "----> #{ind.name}"
    end
    puts "====>  #{table} <===="
    2.times{ puts ''}
  end

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rake db:drop
git checkout master db/structure.sql
rake db:create
rake db:structure:load
rake db:migrate

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# Access crontab -e
crontab -e

# Create a CRON like this
30 10 * * * ~/autobackup.sh

# Create autobackup file
touch ~/autobackup.sh

# autobackup.sh content