Laravel奇怪的PDO fetchMode问题

Question

This works and shows the result set:

$mainFeatures = new Mainfeature;
$mainFeatures->getConnection()->setFetchMode(PDO::FETCH_KEY_PAIR);
$main = $mainFeatures::get(array('id','data'))->toArray();
dd($main); 

But if i try to return with the result set:

return View::make('orders.create')
    ->with('features', Feature::with('Subfeature')->get()->toArray())
    ->with('mainFeatures', $main);

It gives an error:

SQLSTATE[HY000]: General error: PDO::FETCH_KEY_PAIR fetch mode requires the result set to contain extactly 2 columns. (SQL: select * from `features`) (Bindings: array ( ))

Not sure from where select * from features comes in...

Answer 1

I missed that i was changing the fetch mode for the connection and not just the class Mainfeature. So i had to reset it.

$mainFeatures = new Mainfeature;
    $mainFeatures->getConnection()->setFetchMode(PDO::FETCH_KEY_PAIR);
    $main = $mainFeatures::get(array('id','data'))->toArray();
    //dd($h);
    //dd($main);

    $features = new Feature;
    $features->getConnection()->setFetchMode(PDO::FETCH_CLASS);

    return View::make('orders.create')
        ->with('features', $features::with('Subfeature')->get()->toArray())
        ->with('mainFeatures', $main);

Credit goes to Clive for pointing me in the right direction.