Laravel Eloquent Relationship: One To One

Alamat.php

<?php

// app/models/Alamat.php

class Alamat extends Eloquent {

    /**
     * The database table used by the model.
     *
     * @var string
     */
    protected $table = 'alamat';

    /**
     * set timestamps to false
     *
     * @var boolean
     */
    public $timestamps = false;

}

DatabaseSeeder.php

<?php

// app/database/seeds/DatabaseSeeder.php

class DatabaseSeeder extends Seeder {

	/**
	 * Run the database seeds.
	 *
	 * @return void
	 */
	public function run()
	{
		Eloquent::unguard();

		DB::statement('SET FOREIGN_KEY_CHECKS = 0'); // disable foreign key constraints

		$this->call('TabelSiswaSeeder');
		$this->call('TabelAlamatSeeder');

		DB::statement('SET FOREIGN_KEY_CHECKS = 1'); // en

Siswa.php

<?php

// app/models/Siswa.php

class Siswa extends Eloquent {

    /**
     * The database table used by the model.
     *
     * @var string
     */
    protected $table = 'siswa';

    /**
     * set timestamps to false
     *
     * @var boolean
     */
    public $timestamps = false;

    /**
     * relasi dengan tabel alamat
     *
     * @return Illuminate\Database\Eloquent\Collection
     */
    public function alamat()
    {
        return $this->hasOne('Alamat', 'id_siswa', 'id');
    }

}

tabel_alamat.php

<?php

// app/database/migrations/tabel_alamat.php

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class TabelAlamat extends Migration {

    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('alamat', function(Blueprint $table)
        {
            $table->increments('id');
            $table->integer('id_siswa')->unsigned();
            $table->string('alamat');
            $table->foreign('id_siswa')->references('id')->on('siswa')->onDelete('cascade');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('alamat');
    }

}

tabel_siswa.php

<?php

// app/database/migrations/tabel_siswa.php

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class TabelSiswa extends Migration {

    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('siswa', function(Blueprint $table)
        {
            $table->increments('id');
            $table->string('nama');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('siswa');
    }

}

TabelAlamatSeeder.php

<?php

// app/database/seeds/TabelAlamatSeeder.php

class TabelAlamatSeeder extends Seeder {

    public function run()
    {
        Alamat::truncate();

        Alamat::create([
            'id_siswa' => 1,
            'alamat'   => 'Cigugur Kidul'
        ]);

        Alamat::create([
            'id_siswa' => 2,
            'alamat'   => 'Cigugur Kaler'
        ]);
    }

}

TabelSiswaSeeder.php

<?php

// app/database/seeds/TabelSiswaSeeder.php

class TabelSiswaSeeder extends Seeder {

    public function run()
    {
        Siswa::truncate();

        Siswa::create(['nama' => 'Heru Rusdianto']);

        Siswa::create(['nama' => 'Ibnu Rusdianto']);
    }

}