# Instalar a biblioteca
sudo apt-get install libaio1

# Criar a pasta
sudo mkdir /opt/oracle

# Extrair para /opt/oracle
instantclient-basic-linux.x64-18.5.0.0.0dbru.zip
instantclient-sdk-linux.x64-18.5.0.0.0dbru.zip

# Criar o link simbolico da lib
cd /opt/oracle/instantclient_18_5
ln -s libclntsh.so.18.1 libclntsh.so

# Exporta as variaveis abaixo:
export LD_LIBRARY_PATH=/opt/oracle/instantclient_18_5:$LD_LIBRARY_PATH
export PATH=/opt/oracle/instantclient_18_5:$PATH

# Criando o projeto no Rails
rails new projeto -d oracle

# Adiciona no Gemfile
gem 'activerecord-oracle_enhanced-adapter'
gem 'ruby-oci8'

# Instalando as gems
bundle install

# colocar no config/boot.rb
ENV['LD_LIBRARY_PATH'] ||= '/opt/oracle/instantclient_18_5'
ENV['NLS_LANG'] = 'BRAZILIAN PORTUGUESE_BRAZIL.AL32UTF8'


# Criar um arquivo config/oracle.rb e inserir o código
ActiveSupport.on_load(:active_record) do
 ActiveRecord::ConnectionAdapters::OracleEnhancedAdapter.class_eval do
   # true and false will be stored as 'Y' and 'N'
   self.emulate_booleans_from_strings = true

   # start primary key sequences from 1 (and not 10000) and take just one next value in each session
   self.default_sequence_start_value = "1 NOCACHE INCREMENT BY 1"

   # Use old visitor for Oracle 12c database
   self.use_old_oracle_visitor = false

   # other settings ...
   # ActiveRecord::ConnectionAdapters::OracleEnhancedAdapter.default_tablespaces =
   # {:clob => 'TSLOBS', :blob => 'TSLOBS', :index => 'TSINDEXES', :table => 'TSTABLES'}
 end
end