style: hide empty section for articles with no other parts

OliverBooth/Data/Web/ITutorialArticle.cs

@@ -31,6 +31,12 @@ public interface ITutorialArticle
     /// <value>The ID of the folder.</value>
     int Folder { get; }
 
+    /// <summary>
+    ///     Gets a value indicating whether this article is part of a multi-part series.
+    /// </summary>
+    /// <value><see langword="true" /> if this article has additional parts; otherwise, <see langword="false" />.</value>
+    bool HasOtherParts { get; }
+
     /// <summary>
     ///     Gets the ID of this article.
     /// </summary>

OliverBooth/Data/Web/TutorialArticle.cs

@@ -1,3 +1,5 @@
+using System.ComponentModel.DataAnnotations.Schema;
+
 namespace OliverBooth.Data.Web;
 
 /// <summary>
@@ -17,6 +19,10 @@ internal sealed class TutorialArticle : IEquatable<TutorialArticle>, ITutorialAr
     /// <inheritdoc />
     public int Folder { get; private set; }
 
+    /// <inheritdoc />
+    [NotMapped]
+    public bool HasOtherParts => NextPart is not null || PreviousPart is not null;
+
     /// <inheritdoc />
     public int Id { get; private set; }
 

OliverBooth/Pages/Tutorials/Article.cshtml

@@ -60,9 +60,11 @@
     @Html.Raw(TutorialService.RenderArticle(article))
 </article>
 
-<hr>
+@if (article.HasOtherParts)
+{
+    <hr>
 
-<div class="row">
+    <div class="row">
         <div class="col-sm-12 col-md-6">
             @if (article.PreviousPart is { } previousPartId &&
                  TutorialService.TryGetArticle(previousPartId, out ITutorialArticle? previousPart) &&
@@ -89,7 +91,8 @@
                 </p>
             }
         </div>
-</div>
+    </div>
+}
 
 <hr/>