title: The property 'x' is not a navigation property of entity type 'y'
body: <p>I'm using EF Core with ASP Core 2.0. Using latest Identity framework. I get this exception on page All.</p>
  
  <blockquote>
    <p>InvalidOperationException: The property 'User' is not a navigation property of entity type 'Gallery'. The 'Include(string)' method can only be used with a '.' separated list of navigation property names.</p>
  </blockquote>
  
  <p>ApplicationUser looks like:</p>
  
  <pre><code>public class ApplicationUser : IdentityUser&lt;Guid&gt;
  {
      public ICollection&lt;Gallery&gt; Galleries { get; set; }
  }
  </code></pre>
  
  <p>Entity Gallery looks like:</p>
  
  <pre><code>public class Gallery
  {
      public int Id { get; set; }
      public Guid UserId { get; set; }
      public string Title { get; set; }
      public int? ArticleId { get; set; }
      public string Photos { get; set; }
      public DateTime CreatedAt { get; set; }
      public DateTime UpdatedAt { get; set; }
  
      public Article Article { get; set; }
      public ApplicationUser User { get; set; }
  
      [NotMapped]
      public List&lt;string&gt; PhotosList
      {
          get { return Photos?.Split('|').ToList(); }
          set { Photos = string.Join("|", value); }
      }
  }
  </code></pre>
  
  <p>Controller for View looks like:</p>
  
  <pre><code>public async Task&lt;IActionResult&gt; All()
      {
          var databaseContext = db.Galleries.Include(x =&gt; x.Article).Include(x =&gt; x.User);
  
          return View(await databaseContext.ToListAsync());
      }
  </code></pre>
  
  <p>I have no idea why it dont crash on Article..</p>
  
  <p>Database is up-to-date.</p>