title: Call to undefined method Illuminate\Database\Schema\MySqlBuilder::dropForeign()
body: <pre><code>class CreateCommentsTable extends Migration
  {
      /**
       * Run the migrations.
       *
       * @return void
       */
      public function up()
      {
          Schema::create('comments', function (Blueprint $table) {
              $table-&gt;increments('id');
              $table-&gt;string('name');
              $table-&gt;string('email');
              $table-&gt;text('comment');
  
              $table-&gt;boolean('approved');
              $table-&gt;integer('post_id')-&gt;unsigned();
              $table-&gt;timestamps();
          });
  
          Schema::table('comments', function (Blueprint $table) {
              $table-&gt;foreign('post_id')-&gt;references('id')-&gt;on('posts');
          });
      }
  
      /**
       * Reverse the migrations.
       *
       * @return void
       */
      public function down()
      {
          Schema::dropForeign(['post_id']);
          Schema::dropIfExists('comments');
      }
  }
  </code></pre>
  
  <p>This is what my migration class looks like, i have been trying to delete the table from the database but it throws me an error.</p>
  
  <p><strong>Error</strong></p>
  
  <blockquote>
    <p>Call to undefined method Illuminate\Database\Schema\MySqlBuilder::dropForeign()  </p>
  </blockquote>
  
  <p>I have gone through the documentation but it doesnot seem to be of much help.</p>
  
  <p>could anyone please point out my mistake and what would be the solution ?</p>
  
  <p>Just so you know , i am new to laravel.Go easy on me.Thanks!.</p>