go go multi-tenant via schema

PostgreSQLAdapter.rb

class ActiveRecord::ConnectionAdapters::PostgreSQLAdapter
  
  def ensure_search_path!
    return true if existing_path = Thread.current[:search_path] and @schema_search_path == Thread.current[:search_path] 
    if existing_path
      @schema_search_path = Thread.current[:search_path] = existing_path
    else
      puts "WARNING::SETTING SEARCH_PATH TO SUB1,PUBLIC CUZ Thread.current[:search_path] is nil"
      @schema_search_path = Thread.current[:search_path]='sub1,public'
    end
    @connection.async_exec "SET search_path TO #{@schema_search_path}"
  end
  
  def configure_connection
    @async = true
    @connection.async_exec "SET standard_conforming_strings = on"
    @connection.async_exec "SET time zone 'UTC'"
    ensure_search_path!
  end
  
  # Executes an SQL statement, returning a PGresult object on success
  # or raising a PGError exception otherwise.
  def execute(sql, name = nil)
    ensure_search_path!
    log(sql, name) do
      @connection.async_exec(sql)
    end
  end
  
end