Handle nested transactions as a single transaction.

[pitsolu]

In case you call transactions from different places in your code under one other transaction, those end up being nested.

The idea is that there should ever only be one transaction ever - from a db point of view. In the code they might appear
to be multiple transactions, but that is not the case.

Example:

Record::transaction(function(){

	$role = new Role([

		"name"=>"test_role"
	]);
	$role->save();

	// throw new Exception("Fail 1!");
	Record::transaction(function(){

		$role = new Role([

			"name"=>"test_role1"
		]);
		$role->save();

		// throw new Exception("Fail 2!");

		$user = new User([

			"username"=>"yadmin",
			"password"=>sha1("p@55w0rd$$"),
			"role_id"=>$role->id
		]);
		$user->save();
	});

	$user = new User([

		"username"=>"xadmin",
		"password"=>sha1("p@55w0rd$$"),
		"role_id"=>$role->id
	]);
	$user->save();
});

[nicksagona]

Hey - this looks good. I just pushed up some small changes to your branch. The main thing I noticed was that the exception from the rollback method wasn't bubbling up to the main calling script. So I made the rollback call return the exception so that it can be thrown from the transaction call. This way it bubbles up to the main calling script. Let me know your thoughts.

try {
    Record::transaction(function(){
        $role = new Roles([
            'role' => 'Admin'
        ]);
        $role->save();

        //throw new Exception('Error 1');
        Record::transaction(function(){
            $role = new Roles([
                'role' => 'Editor'
            ]);
            $role->save();

            //throw new Exception('Error 2');
            $user = new Users([
                'username' => 'testuser2',
                'password' => 'password2',
                'email'    => '[email protected]'
            ]);
            $user->save();
        });

        $user = new Users([
            'username' => 'testuser1',
            'password' => 'password1',
            'email'    => '[email protected]'
        ]);
        $user->save();
    });
} catch (\Exception $e) {
    echo $e->getMessage();
}

[pitsolu]

Excellent!