migration.php

<?php

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

class CreateInterestsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     * @throws Exception
     */
    public function up()
    {
        try {
            Schema::create('interests', function (Blueprint $table) {
                $table->increments('id');
                $table->string('name', 256)->unique();
                $table->string('description', 512)->nullable();
            });

            Schema::create('interestables', function (Blueprint $table) {
                $table->integer('interest_id')->unsigned();
                $table->morphs('interestable');

                $table->foreign('interest_id')->references('id')->on('interests')
                    ->onDelete('cascade')
                    ->onUpdate('cascade');

                $table->primary(['interest_id', 'interestable_id', 'interestable_type'], 'interestables_pk');
            });
        } catch (\Exception $e) {
            $this->down();
            throw  $e;
        }

    }

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