fix: add missing method from BlogService

OliverBooth/Services/BlogService.cs

@@ -61,7 +61,25 @@ public sealed class BlogService
         int moreIndex = span.IndexOf("<!--more-->", StringComparison.Ordinal);
         trimmed = moreIndex != -1 || span.Length > 256;
         string result = moreIndex != -1 ? span[..moreIndex].Trim().ToString() : post.Body.Truncate(256);
-        return RenderContent(result);
+        return RenderContent(result).Trim();
+    }
+
+    /// <summary>
+    ///     Attempts to find the author by ID.
+    /// </summary>
+    /// <param name="id">The ID of the author.</param>
+    /// <param name="author">
+    ///     When this method returns, contains the <see cref="Author" /> associated with the specified ID, if the author
+    ///     is found; otherwise, <see langword="null" />.
+    /// </param>
+    /// <returns><see langword="true" /> if the author is found; otherwise, <see langword="false" />.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="post" /> is <see langword="null" />.</exception>
+    public bool TryGetAuthor(int id, [NotNullWhen(true)] out Author? author)
+    {
+        using BlogContext context = _dbContextFactory.CreateDbContext();
+        author = context.Authors.FirstOrDefault(a => a.Id == id);
+
+        return author is not null;
     }
 
     /// <summary>
@@ -71,6 +89,7 @@ public sealed class BlogService
     /// <param name="author">
     ///     When this method returns, contains the <see cref="Author" /> associated with the specified blog post, if the
     ///     author is found; otherwise, <see langword="null" />.
+    /// </param>
     /// <returns><see langword="true" /> if the author is found; otherwise, <see langword="false" />.</returns>
     /// <exception cref="ArgumentNullException"><paramref name="post" /> is <see langword="null" />.</exception>
     public bool TryGetAuthor(BlogPost post, [NotNullWhen(true)] out Author? author)