title: Error "Call to undefined method Illuminate\Auth\GenericUser" when accessing to hasMany relationship of Auth::user()
body: <p>I defined a relationship One-to-Many between User and Patient, but when I try to save a new patient record with the authenticated user I get the error </p>
  
  <blockquote>
    <p>Call to undefined method Illuminate\Auth\GenericUser::patients()</p>
  </blockquote>
  
  <p>Here are my tables:</p>
  
  <pre><code>// Users table
  Schema::create('users', function (Blueprint $table) {
      $table-&gt;increments('id');
      $table-&gt;string('name');
      $table-&gt;string('email')-&gt;unique();
      $table-&gt;string('password', 60);
      $table-&gt;rememberToken();
      $table-&gt;timestamps();
      $table-&gt;softDeletes();
  });
  
  // Patients table
  Schema::create('patients', function (Blueprint $table) {
      $table-&gt;increments('id');
      //Foreign key
      $table-&gt;integer('user_id')-&gt;unsigned();
      $table-&gt;string('ci')-&gt;unique();
      $table-&gt;string('name');
      $table-&gt;string('last_name');
      $table-&gt;string('gender');
      $table-&gt;date('birth_date')-&gt;nullable();
      $table-&gt;string('place')-&gt;nullable();
      $table-&gt;timestamps();
      $table-&gt;softDeletes();
  
      $table-&gt;foreign('user_id')
            -&gt;references('id')-&gt;on('users');
  });
  </code></pre>
  
  <p>In PatientController I call Auth::user() to save a new patient:</p>
  
  <pre><code>public function store(PatientRequest $request){
      $patient = new Patient($request-&gt;all());
      Auth::user()-&gt;patients()-&gt;save($patient);
      $last = Patient::get()-&gt;last();
  
      return redirect()-&gt;route('patient.histories.create', [$last-&gt;id])-&gt;with('message', 'Success!');
  }
  </code></pre>
  
  <p>And the relationships are defined as follows:</p>
  
  <pre><code>// IN USER MODEL
  public function patients(){
      return $this-&gt;hasMany('App\Patient');
  }
  
  // IN PATIENT MODEL
  public function user(){
      return $this-&gt;belongsTo('App\User');
  }
  </code></pre>
  
  <p>At this point I really don't know what is wrong, but when I create a new patient record from tinker it works as expected:</p>
  
  <pre><code>&gt;&gt;&gt; $patient = new App\Patient;
  &gt;&gt;&gt; $patient-&gt;ci = "1234567";
  .......
  .......
  
  &gt;&gt;&gt; $user = App\User::first();
  &gt;&gt;&gt; $user-&gt;patients()-&gt;save($patient);
  </code></pre>
  
  <p>Can someone spot where is the error, please? </p>