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I don't quite understand how to properly name ORM models? I have following relation: polls has many poll_options. Table names are "polls" and "poll_options". I have created 2 ORM models: 1. Poll model

class Model_Poll extends \Orm\Model
{
 protected static $_properties = array(
  'id',
  'title',
  'created_at'
 );
 
 protected static $_has_many = array(
     'polloptions' => array(
         'key_from' => 'id',
         'model_to' => 'Model_Poll_Option',
         'key_to' => 'poll_id',
         'cascade_save' => true,
         'cascade_delete' => false,
     )
 );
}

2. Pool_option model

class Model_Poll_Option extends \Orm\Model
{
 protected static $_properties = array(
  'id',
  'poll_id',
  'title'
 );
 
 protected static $_belongs_to = array(
     'poll' => array(
         'key_from' => 'poll_id',
         'model_to' => 'Model_Poll',
         'key_to' => 'id',
         'cascade_save' => true,
         'cascade_delete' => false,
     )
 );
}

This would fail when calling for $poll->pool_options with error message: "Fuel\Core\FuelException [ Error ]: Related model not found by Has_Many relation "poll_options": Model_Poll_Option". I figured out the Model_Pool_Option model naming is wrong. But can't figure out how to properly name it? Tried Model_Pool_option... doesn't work either. At the end I have tried my models like this and it is working. 1. Pool model

class Model_Poll extends \Orm\Model
{
 protected static $_properties = array(
  'id',
  'title',
  'created_at'
 );
 
 protected static $_has_many = array(
     'polloptions' => array(
         'key_from' => 'id',
         'model_to' => 'Model_Polloption',
         'key_to' => 'poll_id',
         'cascade_save' => true,
         'cascade_delete' => false,
     )
 );
}

2. Poll_option model

class Model_Polloption extends \Orm\Model
{
 protected static $_table_name = 'poll_options';

 protected static $_properties = array(
  'id',
  'poll_id',
  'title'
 );
 
 protected static $_belongs_to = array(
     'poll' => array(
         'key_from' => 'poll_id',
         'model_to' => 'Model_Poll',
         'key_to' => 'id',
         'cascade_save' => true,
         'cascade_delete' => false,
     )
 ); 
}

I would like to understand why the above naming "Model_Pool_Option" fails and how to properly fix that?