How to add combined unique fields validator rule in Laravel 4

Question

I am using Laravel 4.2 and mysql db .
I have an exam table in which i am taking Exams entry and the fields are -->
id | examdate | batch | chapter | totalmark

Answer 1

It didn't work for me so I adjusted the code a tiny bit.

Validator::extend('unique_multiple', function ($attribute, $value, $parameters, $validator)
{
     // Get the other fields
     $fields = $validator->getData();

     // Get table name from first parameter
     $table = array_shift($parameters);

    // Build the query
    $query = DB::table($table);

    // Add the field conditions
    foreach ($parameters as $i => $field) {
        $query->where($field, $fields[$field]);
    }

    // Validation result will be false if any rows match the combination
    return ($query->count() == 0);
 });

The validator looks like this. You don't need a particular order of DB table column names as stated in the other answer.

$validator = Validator::make($request->all(), [
        'attributeName' => 'unique_multiple:tableName,field[1],field[2],....,field[n]'
    ],[
        'unique_multiple' => 'This combination already exists.'
    ]);