title: What does onDelete('cascade') mean?
body: <pre class="lang-php prettyprint-override"><code>Schema::table('posts', function (Blueprint $table) {
      $table-&gt;integer('user_id')-&gt;unsigned();
      $table-&gt;foreign('user_id')-&gt;references('id')-&gt;on('users')-&gt;onDelete('cascade');
  });
  </code></pre>
  <p>Does this mean that if I delete a post, the user will also be deleted or does it mean if I delete a user, all their posts will be deleted?</p>