Generic attach m2m relationship service.

generic_m2m.php

<?php

// Generic attach m2m relationship service.
Route::post('/admin/attach', function()
{
  $input = Input::get();
  $parent = $input['parent']['name']::find($input['parent']['id']);

  $child = $input['child']['name']::find($input['child']['id']);

  $parent->{Str::plural($input['child']['name'])}()->attach($child->id);

  return Response::json(array('status'=>1));
});