Database Forge Class - Set Default Collation

Is there a way to set the default collation using Codeigniter's Database Forge Class? It defaults to 'utf8_general_ci' but I want to override that to 'utf8_unicode_ci'.

Code:

$attributes = array(
 'ENGINE' => 'InnoDB',
 'COLLATION' => 'utf8_unicode_ci'
);
$this->dbforge->create_table(table_name, FALSE, $attributes);

When I add this (my best guess on how to set it) it produces an error.

Code:

'COLLATION' => 'utf8_unicode_ci'

Documentation does not specify how to set the default collation.

The default collation is set in the ,/application/config/database.php configuration file.

Also when you create the database it ask you for the collation.

What did you Try? What did you Get? What did you Expect?

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