Theme template and hook_theme

Question

I have a content type 'leg' and a template node--leg.tpl.php.
I'm using sky theme. I have a custom module as well, let's say for example, mymodule.
I put the template file into sites/all/modules/mymodule/theme. And I created a hook_theme and hook_preprocess_node.
But my template is not invoked as expected. I cleared all caches.

function mymodule_theme(){
    // The base theme registers node.tpl.php.
    $templates['node'] = array(
        'arguments' => array('elements' => NULL),
        'path' => drupal_get_path('module', 'mymodule') . '/theme',
        'template' => 'node--leg',
        'preprocess functions' => array(
          'template_preprocess',
          'mymodule_preprocess',
          'mymodule_preprocess_node',
          'mymodule_process',
        ),
    );
    return $templates;
}

function mymodule_preprocess_node(&$vars, $hooks){
    if($vars['type'] == 'leg'){

    }
}

When I put my template file into sites/all/themes/sky/templates and changed path in hook_theme to that location, it works.

function mymodule_theme(){
    // The base theme registers node.tpl.php.
    $templates['node'] = array(
        'arguments' => array('elements' => NULL),
        'path' => drupal_get_path('theme', 'sky') . '/templates',
        'template' => 'node--leg',
        'preprocess functions' => array(
          'template_preprocess',
          'mymodule_preprocess',
          'mymodule_preprocess_node',
          'mymodule_process',
        ),
    );
    return $templates;
}

I would like to know it is a right way or not.
I should not place my template in the sky theme folder, am I right ?

Answer 1

drupal_get_path('theme', 'mymodule') should be drupal_get_path('module', 'mymodule').

Answer 2

I resolved this by following :

• override node.tpl.php in a module
• Adding a module path to Drupal 7 theme registry