Laravel Eloquent Relationship: Many To Many

DatabaseSeeder.php

<?php

// app/database/seeds/DatabaseSeeder.php

/**
 * Class DatabaseSeeder
 */
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('TabelMahasiswaSeeder');
        $this->call('TabelMatakuliahSeeder');
        $this->call('TabelMahasiswaMatakuliahSeeder');

        DB::statement('SET FOREIGN_KEY_CHECKS = 1'); // enable foreign key constraints
    }

}

Mahasiswa.php

<?php

// app/models/Mahasiswa.php

/**
 * Class Mahasiswa
 */
class Mahasiswa extends Eloquent {

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

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

    /**
     * relasi dengan tabel matakuliah
     *
     * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
     */
    public function matakuliah()
    {
        return $this->belongsToMany('Matakuliah', 'mahasiswa_matakuliah', 'id_mahasiswa', 'id_matakuliah');
    }

}

MahasiswaMatakuliah.php

<?php

// app/models/MahasiswaMatakuliah.php

/**
 * Class MahasiswaMatakuliah
 */
class MahasiswaMatakuliah extends Eloquent {

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

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

}

Matakuliah.php

<?php

// app/models/Matakuliah.php

/**
 * Class Matakuliah
 */
class Matakuliah extends Eloquent {

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

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

    /**
     * relasi dengan tabel mahasiswa
     *
     * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
     */
    public function mahasiswa()
    {
        return $this->belongsToMany('Mahasiswa', 'mahasiswa_matakuliah', 'id_matakuliah', 'id_mahasiswa');
    }

}

tabel_mahasiswa.php

<?php

// app/database/migrations/tabel_mahasiswa.php

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

/**
 * Class TabelMahasiswa
 */
class TabelMahasiswa extends Migration {

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

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

}

tabel_mahasiswa_matakuliah.php

<?php

// app/database/migrations/tabel_mahasiswa_matakuliah.php

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

/**
 * Class TabelMahasiswaMatakuliah
 */
class TabelMahasiswaMatakuliah extends Migration {

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

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

}

tabel_matakuliah.php

<?php

// app/database/migrations/tabel_matakuliah.php

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

/**
 * Class TabelMatakuliah
 */
class TabelMatakuliah extends Migration {

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

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

}

TabelMahasiswaMatakuliahSeeder.php

<?php

// app/database/seeds/TabelMahasiswaMatakuliahSeeder.php

/**
 * Class TabelMahasiswaMatakuliahSeeder
 */
class TabelMahasiswaMatakuliahSeeder extends Seeder {

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

        MahasiswaMatakuliah::create([
            'id_mahasiswa'  => 1,
            'id_matakuliah' => 1
        ]);

        MahasiswaMatakuliah::create([
            'id_mahasiswa'  => 1,
            'id_matakuliah' => 2
        ]);

        MahasiswaMatakuliah::create([
            'id_mahasiswa'  => 2,
            'id_matakuliah' => 1
        ]);

        MahasiswaMatakuliah::create([
            'id_mahasiswa'  => 2,
            'id_matakuliah' => 2
        ]);

        MahasiswaMatakuliah::create([
            'id_mahasiswa'  => 2,
            'id_matakuliah' => 3
        ]);
    }

}

TabelMahaSiswaSeeder.php

<?php

// app/database/seeds/TabelMahaSiswaSeeder.php

/**
 * Class TabelMahasiswaSeeder
 */
class TabelMahasiswaSeeder extends Seeder {

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

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

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

}

TabelMatakuliahSeeder.php

<?php

// app/database/seeds/TabelMatakuliahSeeder.php

/**
 * Class TabelMatakuliahSeeder
 */
class TabelMatakuliahSeeder extends Seeder {

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

        Matakuliah::create([
            'nama' => 'HTML'
        ]);

        Matakuliah::create([
            'nama' => 'PHP'
        ]);

        Matakuliah::create([
            'nama' => 'JAVA'
        ]);
    }

}