Edit and create blog posts

Website.Tests/Models/BlogPostTests.cs

@@ -0,0 +1,31 @@
+using FluentAssertions;
+using Website.Models;
+using Xunit;
+
+namespace Website.Tests.Models {
+	public class BlogPostTests {
+		[Fact]
+		public void UpdateTitle_WithNewTitle_UpdatesTitlePropertyAndRegeneratesUrl() {
+			var post = new BlogPost();
+			post.UpdateTitle("new title");
+
+			post.Title.Should().Be("new title");
+			post.Url.Should().Be("new-title");
+		}
+
+		[Fact]
+		public void UpdateDraft_WithContent_UpdatesDraftProperty() {
+			var post = new BlogPost();
+			post.UpdateDraft("content");
+			post.Draft.Should().Be("content");
+		}
+
+		[Fact]
+		public void Publish_SetsContentToDraft() {
+			var post = new BlogPost();
+			post.UpdateDraft("content");
+			post.Publish();
+			post.Content.Should().Be("content");
+		}
+	}
+}

Website/Controllers/BlogController.cs

@@ -3,13 +3,14 @@ using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
 using Website.Data;
+using Website.Models;
 using Website.ViewModels;
 
 namespace Website.Controllers
 {
 	public class BlogController : Controller
 	{
-		const int MaxPostsPerPage = 10;
+		private const int MaxPostsPerPage = 10;
 		private readonly BlogRepository _repo;
 
 		public BlogController(BlogRepository repo)
@@ -36,5 +37,35 @@ namespace Website.Controllers
 				return NotFound();
 			}
 		}
+
+		public async Task<IActionResult> Edit(int? id) {
+			if (!id.HasValue)
+				return View();
+
+			try {
+				var post = await _repo.GetPostByIdAsync(id.Value);
+				var model = new BlogPostSubmission {
+					Id = post.Id,
+					Title = post.Title,
+					Content = post.Draft
+				};
+				return View(model);
+			}
+			catch (InvalidOperationException) {
+				return NotFound();
+			}
+		}
+
+		[HttpPost]
+		public async Task<IActionResult> Save(BlogPostSubmission submission) {
+			var post = submission.Id.HasValue ? await _repo.GetPostByIdAsync(submission.Id.Value) : new BlogPost();
+
+			post.UpdateTitle(submission.Title);
+			post.UpdateDraft(submission.Content);
+
+			var savedPost = await _repo.SavePost(post);
+
+			return RedirectToAction(nameof(Edit), new{savedPost.Id});
+		}
 	}
 }

Website/Data/BlogRepository.cs

@@ -42,5 +42,27 @@ namespace Website.Data
 				return result.First();
 			}
 		}
+
+		public async Task<BlogPost> GetPostByIdAsync(int id) {
+			const string query = "SELECT * FROM blog_posts WHERE post_id=@id AND post_deleted=0";
+			using (var connection = _dbProvider.NewConnection()) {
+				connection.Open();
+				var result = await connection.QueryAsync<BlogPostState>(query, new {id});
+				return new BlogPost(result.First());
+			}
+		}
+
+		public async Task<BlogPost> SavePost(BlogPost post) {
+			const string newPostQuery = "INSERT INTO blog_posts (post_title, post_content, post_draft, post_url) VALUES (@title, @content, @draft, @url); SELECT CAST(LAST_INSERT_ID() as int)";
+			const string updatePostQuery = "UPDATE blog_posts SET post_id = @id, post_title = @title, post_content = @content, post_draft = @draft, post_url = @url WHERE post_id = @id ";
+
+			var query = post.Id == 0 ? newPostQuery : updatePostQuery;
+
+			using (var connection = _dbProvider.NewConnection()) {
+				connection.Open();
+				var result = await connection.QueryAsync<int>(query, post);
+				return await GetPostByIdAsync(result.Single());
+			}
+		}
 	}
 }

Website/Models/BlogPost.cs

@@ -5,6 +5,10 @@ namespace Website.Models
 {
 	public class BlogPost
 	{
+		public BlogPost() {
+			
+		}
+
 		public BlogPost(BlogPostState state)
 		{
 			Id = state.Post_Id;
@@ -23,5 +27,17 @@ namespace Website.Models
 		public string Draft { get; private set; }
 		public string Url { get; private set; }
 		public int UserId { get; private set; }
+
+		private void GenerateUrl() {
+			Url = Title.Replace(' ', '-');
+		}
+
+		public void UpdateTitle(string title) {
+			Title = title;
+			GenerateUrl();
+		}
+
+		public void UpdateDraft(string content) => Draft = content;
+		public void Publish() => Content = Draft;
 	}
 }

Website/Models/BlogPostSubmission.cs

@@ -0,0 +1,7 @@
+namespace Website.Models {
+	public class BlogPostSubmission {
+		public int? Id { get; set; }
+		public string Title { get; set; }
+		public string Content { get; set; }
+	}
+}

Website/Views/Blog/Edit.cshtml

@@ -0,0 +1,18 @@
+@model Website.Models.BlogPostSubmission
+
+@{
+	ViewBag.Title = Model != null ? "Edit Post" : "New Post";
+}
+
+<form method="post" action="/blog/save">
+	<input type="hidden" name="id" value="@Model?.Id"/>
+	<label for="postTitle">Title: </label><input name="title" id="postTitle" value="@Model?.Title"/>
+	<textarea id="postContent" name="content">@Model?.Content</textarea>
+	<button type="submit">Save</button>
+</form>
+
+<link rel="stylesheet" href="https://cdn.jsdelivr.net/simplemde/latest/simplemde.min.css">
+<script src="https://cdn.jsdelivr.net/simplemde/latest/simplemde.min.js"></script>
+<script>
+	var simpleMde = new SimpleMDE({ element: document.getElementById("postContent"), tabSize: 4 });
+</script>