1  <?php
 2  
 3  use Illuminate\Database\Migrations\Migration;
 4  use Illuminate\Database\Schema\Blueprint;
 5  use Illuminate\Support\Facades\Schema;
 6  
 7  class CreateRevisionRevisionTable extends Migration
 8  {
 9      /**
10       * Run the migrations.
11       *
12       * @return void
13       */
14      public function up()
15      {
16          Schema::create('revision_revision', function (Blueprint $table) {
17              $table->id();
18              $table->foreignId('referenced_revision_id')->nullable()->constrained('revisions')->cascadeOnUpdate()->nullOnDelete();
19              $table->foreignId('revision_id')->nullable()->constrained('revisions')->cascadeOnUpdate()->nullOnDelete();
20  
21              $table->unique(['referenced_revision_id', 'revision_id']);
22  
23              $table->timestamps();
24          });
25      }
26  
27      /**
28       * Reverse the migrations.
29       *
30       * @return void
31       */
32      public function down()
33      {
34          Schema::dropIfExists('revision_revision');
35      }
36  }