From 39b7df9dd1a49f112491c6d7914ce3501a563362 Mon Sep 17 00:00:00 2001
From: Steven Giesel <stgiesel35@gmail.com>
Date: Sat, 15 Jan 2022 15:06:27 +0100
Subject: [PATCH] Don't update blogpost when same reference

---
 src/LinkDotNet.Blog.Domain/BlogPost.cs              |  7 ++++++-
 .../Domain/BlogPostTests.cs                         | 13 ++++++++++++-
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/src/LinkDotNet.Blog.Domain/BlogPost.cs b/src/LinkDotNet.Blog.Domain/BlogPost.cs
index 65ed25d1..a0c6d2a2 100644
--- a/src/LinkDotNet.Blog.Domain/BlogPost.cs
+++ b/src/LinkDotNet.Blog.Domain/BlogPost.cs
@@ -51,6 +51,11 @@ public static BlogPost Create(
 
     public void Update(BlogPost from)
     {
+        if (from == this)
+        {
+            return;
+        }
+
         Title = from.Title;
         ShortDescription = from.ShortDescription;
         Content = from.Content;
@@ -75,4 +80,4 @@ private void ReplaceTags(IEnumerable<Tag> tags)
             }
         }
     }
-}
+}
\ No newline at end of file
diff --git a/tests/LinkDotNet.Blog.UnitTests/Domain/BlogPostTests.cs b/tests/LinkDotNet.Blog.UnitTests/Domain/BlogPostTests.cs
index 10aa0d91..729d6b6f 100644
--- a/tests/LinkDotNet.Blog.UnitTests/Domain/BlogPostTests.cs
+++ b/tests/LinkDotNet.Blog.UnitTests/Domain/BlogPostTests.cs
@@ -59,4 +59,15 @@ public void ShouldSetDateWhenGiven()
 
         blog.UpdatedDate.Should().Be(somewhen);
     }
-}
+
+    [Fact]
+    public void ShouldNotDeleteTagsWhenSameReference()
+    {
+        var bp = new BlogPostBuilder().WithTags("tag 1").Build();
+
+        bp.Update(bp);
+
+        bp.Tags.Should().HaveCount(1);
+        bp.Tags.Single().Content.Should().Be("tag 1");
+    }
+}
\ No newline at end of file