Q:

connecting postgresql and codeigniter

I'm new using postgresql and I've been using Codeigniter for a year.
I have a small postgresql database and I wanna call it from Codeigniter.
In my database.php file I have this setup:
$active_group = 'default';
$query_builder = TRUE;

$db['default'] = array(
'dsn'   => 'pgsql:host=localhost;port=5432;dbname=test;user=postgres;password=aPass',
// 'dsn'    => '',
'hostname' => 'localhost',
'username' => 'postgres',
'password' => 'aPass',
'database' => 'test',
'dbdriver' => '',
'dbprefix' => '',
'pconnect' => FALSE,
'db_debug' => TRUE,
'cache_on' => FALSE,
'cachedir' => '',
'char_set' => 'utf8',
'dbcollat' => 'utf8_general_ci',
'swap_pre' => '',
'encrypt' => FALSE,
'compress' => FALSE,
'stricton' => FALSE,
'failover' => array(),
'save_queries' => TRUE
  // 'port' => '5432'
);

In a controller I have this function:
public function dbtest(){

    $this->load->database();

    $feeds = $this->db->get('vts_feeds');
    echo $feeds;die();
}

The result I'm getting is:
An Error Was Encountered
You have not selected a database type to connect to.

Why is it not working?

A:

Try to set, 

dbdriver - The database type. ie: mysql, postgres, odbc, etc. Must be
  specified in lower case.

More Info: https://www.codeigniter.com/user_guide/database/configuration.html
EDIT: Try this config for PDO in postgres
$db['default']['hostname'] = 'pgsql:host=localhost;dbname=yourdb'; //set host
$db['default']['username'] = 'your username'; //set username
$db['default']['password'] = 'your password'; //set password
$db['default']['database'] = 'your database'; //set databse
$db['default']['dbdriver'] = 'pdo'; //set driver here

A:

Remove the 'dsn' string and change to 'dbdriver' => 'postgre' in the config array. 
Despite the CI docs stating the value should be 'postgres' if you check the directory and file names in system>database>drivers the folder is actually called 'postgre', the file name 'postgre_driver.php' and the class 'CI_DB_postgre_driver' so we can assume the docs are wrong here. Weird this hasnt raised its ugly head before

