Authentication -> User polymorphic relationships in Laravel.

auth-users.php

<?php

Schema::create('users', function(Blueprint $table)
{
    $table->increments('id');
    $table->string('username')->unique();
    $table->string('password');
    $table->unsignedInteger('user_typeable_id');
    $table->string('user_typeable_type');
    $table->rememberToken();
});

DB::table('users')->insert([
    'username' => 'jbloggs', 
    'password' => Hash::make('password'), 
    'user_typeable_id' => 1, 
    'user_typeable_type' => 'App\Student'
]);

DB::table('users')->insert([
    'username' => 'jdoe', 
    'password' => Hash::make('password'), 
    'user_typeable_id' => 1, 
    'user_typeable_type' => 'App\Teacher'
]);

AuthController.php

<?php namespace App\Http\Controllers;

use App\Http\Requests\LoginRequest;

class AuthController extends Controller {

    /**
    * @param \App\Http\Requests\LoginRequest $request
    * @return \Illuminate\Http\RedirectResponse
    */
    public function submitLogin(LoginRequest $request)
    {
        $authenticated = app('auth')->attempt(
            $request->only('email', 'password'),
            $request->has('remember')
        );
    
        if ($authenticated)
        {
            $user = app('auth')->user()->userTypeable;
            if (is_a($user, 'App\Student'))
            {
                // Student has logged in...
            }
            else if (is_a($user, 'App\Teacher'))
            {
                // Teacher has logged in...
            }
            
            return redirect()->intended();
        }
    }

}

students-schema.php

<?php

Schema::create('students', function(Blueprint $table)
{
    $table->increments('id');
    $table->string('forename');
    $table->string('surname');
    $table->string('email');
    $table->string('student_number');
    $table->boolean('enrolled');
});

DB::table('students')->insert([
    'id' => 1,
    'forename' => 'Joe',
    'surname' => 'Bloggs',
    'email' => '[email protected]',
    'student_number' => 'QWE12345',
    'enrolled' => true
]);

teacher-schema.php

<?php

Schema::create('teacher', function(Blueprint $table)
{
    $table->increments('id');
    $table->string('forename');
    $table->string('surname');
    $table->string('email');
    $table->date('contract_start_date');
    $table->string('subject');
});

DB::table('teachers')->insert([
    'id' => 1,
    'forename' => 'John',
    'surname' => 'Doe',
    'email' => '[email protected]',
    'contract_start_date' => new DateTime(),
    'subject' => 'Mathematics'
]);