Application/AddLink/AddLinkCommandHandler.cs

@@ -10,15 +10,17 @@ namespace HN.Application
   public class AddLinkCommandHandler : IRequestHandler<AddLinkCommand, Guid>
   {
     private readonly ILinkRepository _repository;
+    private readonly IExecutingUserProvider _executingUserProvider;
 
-    public AddLinkCommandHandler(ILinkRepository repository)
+    public AddLinkCommandHandler(ILinkRepository repository, IExecutingUserProvider executingUserProvider)
     {
-      this._repository = repository;
+      _repository = repository;
+      _executingUserProvider = executingUserProvider;
     }
 
     public async Task<Guid> Handle(AddLinkCommand request, CancellationToken cancellationToken)
     {
-      var link = Link.FromUrl(request.Url);
+      var link = Link.FromUrl(_executingUserProvider.GetCurrentUserId(), request.Url);
 
       await this._repository.AddAsync(link);
 

Application/CommentLink/CommentLinkCommandHandler.cs

@@ -10,17 +10,19 @@ namespace HN.Application
   {
     private readonly ILinkRepository _linkRepository;
     private readonly ICommentRepository _commentRepository;
+    private readonly IExecutingUserProvider _executingUserProvider;
 
-    public CommentLinkCommandHandler(ILinkRepository linkRepository, ICommentRepository commentRepository)
+    public CommentLinkCommandHandler(ILinkRepository linkRepository, ICommentRepository commentRepository, IExecutingUserProvider executingUserProvider)
     {
       _linkRepository = linkRepository;
       _commentRepository = commentRepository;
+      _executingUserProvider = executingUserProvider;
     }
 
     public async Task<Guid> Handle(CommentLinkCommand request, CancellationToken cancellationToken)
     {
       var link = await _linkRepository.GetByIdAsync(request.LinkId);
-      var comment = link.AddComment(request.Content);
+      var comment = link.AddComment(_executingUserProvider.GetCurrentUserId(), request.Content);
 
       await _commentRepository.AddAsync(comment);
 

Application/IExecutingUserProvider.cs

@@ -0,0 +1,12 @@
+using System;
+
+namespace HN.Application
+{
+  /// <summary>
+  /// Permet de récupérer l'utilisateur courant effectuant une commande.
+  /// </summary>
+  public interface IExecutingUserProvider
+  {
+    Guid GetCurrentUserId();
+  }
+}

Application/VoteForComment/VoteForCommentCommandHandler.cs

@@ -8,23 +8,26 @@ namespace HN.Application
   public sealed class VoteForCommentCommandHandler : IRequestHandler<VoteForCommentCommand>
   {
     private readonly ICommentRepository _commentRepository;
+    private readonly IExecutingUserProvider _executingUserProvider;
 
-    public VoteForCommentCommandHandler(ICommentRepository commentRepository)
+    public VoteForCommentCommandHandler(ICommentRepository commentRepository, IExecutingUserProvider executingUserProvider)
     {
       _commentRepository = commentRepository;
+      _executingUserProvider = executingUserProvider;
     }
 
     public async Task<Unit> Handle(VoteForCommentCommand request, CancellationToken cancellationToken)
     {
       var comment = await _commentRepository.GetByIdAsync(request.CommentId);
+      var userId = _executingUserProvider.GetCurrentUserId();
 
       switch (request.Type)
       {
         case VoteType.Up:
-          comment.Upvote();
+          comment.Upvote(userId);
           break;
         case VoteType.Down:
-          comment.Downvote();
+          comment.Downvote(userId);
           break;
       }
 

Application/VoteForLink/VoteForLinkCommandHandler.cs

@@ -8,23 +8,26 @@ namespace HN.Application
   public sealed class VoteForLinkCommandHandler : IRequestHandler<VoteForLinkCommand>
   {
     private readonly ILinkRepository _linkRepository;
+    private readonly IExecutingUserProvider _executingUserProvider;
 
-    public VoteForLinkCommandHandler(ILinkRepository linkRepository)
+    public VoteForLinkCommandHandler(ILinkRepository linkRepository, IExecutingUserProvider executingUserProvider)
     {
       _linkRepository = linkRepository;
+      _executingUserProvider = executingUserProvider;
     }
 
     public async Task<Unit> Handle(VoteForLinkCommand request, CancellationToken cancellationToken)
     {
       var link = await _linkRepository.GetByIdAsync(request.LinkId);
+      var userId = _executingUserProvider.GetCurrentUserId();
 
       switch (request.Type)
       {
         case VoteType.Up:
-          link.Upvote();
+          link.Upvote(userId);
           break;
         case VoteType.Down:
-          link.Downvote();
+          link.Downvote(userId);
           break;
       }
 

Apps/Website/HttpExecutingUserProvider.cs

@@ -0,0 +1,25 @@
+using System;
+using HN.Application;
+using HN.Infrastructure;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Identity;
+
+namespace Website
+{
+  public sealed class HttpExecutingUserProvider : IExecutingUserProvider
+  {
+    private readonly IHttpContextAccessor _httpContextAccessor;
+    private readonly UserManager<User> _userManager;
+
+    public HttpExecutingUserProvider(IHttpContextAccessor httpContextAccessor, UserManager<User> userManager)
+    {
+      _httpContextAccessor = httpContextAccessor;
+      _userManager = userManager;
+    }
+
+    public Guid GetCurrentUserId()
+    {
+      return Guid.Parse(_userManager.GetUserId(_httpContextAccessor.HttpContext.User));
+    }
+  }
+}

Apps/Website/Startup.cs

@@ -30,6 +30,7 @@ namespace Website
       services.AddScoped<IHNContext, HNDbContext>();
       services.AddScoped<ILinkRepository, LinkRepository>();
       services.AddScoped<ICommentRepository, CommentRepository>();
+      services.AddScoped<IExecutingUserProvider, HttpExecutingUserProvider>();
       services.AddMediatR(typeof(HN.Application.IHNContext));
 
       // Permet d'avoir des routes en lowercase

Domain/Comment.cs

@@ -1,34 +1,22 @@
 using System;
-using System.Collections.Generic;
 
 namespace HN.Domain
 {
-  public sealed class Comment
+  public sealed class Comment : Votable
   {
-    public Guid Id { get; private set; }
-    public Guid LinkId { get; private set; }
-    public string Content { get; private set; }
-    public DateTime CreatedAt { get; private set; }
-    private List<Vote> _votes;
-    public IReadOnlyList<Vote> Votes => _votes;
+    public Guid Id { get; }
+    public Guid LinkId { get; }
+    public string Content { get; }
+    public Guid CreatedBy { get; }
+    public DateTime CreatedAt { get; }
 
-    internal Comment(Guid linkId, string content)
+    internal Comment(Guid linkId, Guid createdBy, string content) : base()
     {
       Id = Guid.NewGuid();
       LinkId = linkId;
+      CreatedBy = createdBy;
       Content = content;
       CreatedAt = DateTime.UtcNow;
-      _votes = new List<Vote>();
-    }
-
-    public void Upvote()
-    {
-      _votes.Add(new Vote(VoteType.Up));
-    }
-
-    public void Downvote()
-    {
-      _votes.Add(new Vote(VoteType.Down));
     }
   }
 }

Domain/Link.cs

@@ -1,42 +1,30 @@
 using System;
-using System.Collections.Generic;
 
 namespace HN.Domain
 {
-  public sealed class Link
+  public sealed class Link : Votable
   {
     public Guid Id { get; }
     public string Url { get; }
     public DateTime CreatedAt { get; }
-    private List<Vote> _votes;
-    public IReadOnlyList<Vote> Votes => _votes;
+    public Guid CreatedBy { get; }
 
-    private Link(string url)
+    private Link(Guid createdBy, string url) : base()
     {
-      this.Id = Guid.NewGuid();
-      this.CreatedAt = DateTime.UtcNow;
-      this.Url = url;
-      this._votes = new List<Vote>();
+      Id = Guid.NewGuid();
+      CreatedBy = createdBy;
+      CreatedAt = DateTime.UtcNow;
+      Url = url;
     }
 
-    public static Link FromUrl(string url)
+    public static Link FromUrl(Guid posterId, string url)
     {
-      return new Link(url);
+      return new Link(posterId, url);
     }
 
-    public void Upvote()
+    public Comment AddComment(Guid userId, string content)
     {
-      _votes.Add(new Vote(VoteType.Up));
-    }
-
-    public void Downvote()
-    {
-      _votes.Add(new Vote(VoteType.Down));
-    }
-
-    public Comment AddComment(string content)
-    {
-      return new Comment(Id, content);
+      return new Comment(Id, userId, content);
     }
   }
 }

Domain/Votable.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace HN.Domain
+{
+  /// <summary>
+  /// Représente une entité sur laquelle on peut voter.
+  /// </summary>
+  public abstract class Votable
+  {
+    private List<Vote> _votes;
+    public IReadOnlyList<Vote> Votes => _votes;
+
+    protected Votable()
+    {
+      _votes = new List<Vote>();
+    }
+
+    public void Upvote(Guid userId)
+    {
+      UpsertUserVote(userId, VoteType.Up);
+    }
+
+    public void Downvote(Guid userId)
+    {
+      UpsertUserVote(userId, VoteType.Down);
+    }
+
+    private void UpsertUserVote(Guid userId, VoteType type)
+    {
+      var vote = _votes.SingleOrDefault(v => v.CreatedBy == userId);
+
+      if (vote == null)
+      {
+        _votes.Add(new Vote(userId, type));
+        return;
+      }
+
+      vote.HasType(type);
+    }
+  }
+}

Domain/Vote.cs

@@ -5,9 +5,21 @@ namespace HN.Domain
   public sealed class Vote
   {
     public VoteType Type { get; private set; }
+    public Guid CreatedBy { get; }
     public DateTime CreatedAt { get; private set; }
 
-    internal Vote(VoteType type)
+    internal Vote(Guid createdBy, VoteType type)
+    {
+      CreatedBy = createdBy;
+      Type = type;
+      CreatedAt = DateTime.UtcNow;
+    }
+
+    /// <summary>
+    /// Change le type d'un vote
+    /// </summary>
+    /// <param name="type"></param>
+    public void HasType(VoteType type)
     {
       Type = type;
       CreatedAt = DateTime.UtcNow;

Infrastructure/EntityTypes/CommentEntityType.cs

@@ -17,11 +17,14 @@ namespace HN.Infrastructure
       builder.Property(o => o.Content).IsRequired();
       builder.Property(o => o.CreatedAt).IsRequired();
 
+      builder.HasOne<User>().WithMany().HasForeignKey(nameof(Comment.CreatedBy)).IsRequired();
+
       builder.OwnsMany(o => o.Votes, vote =>
       {
         vote.ToTable("comment_votes");
         vote.WithOwner().HasForeignKey("CommentId");
-        vote.HasKey("CommentId");
+        vote.HasKey("CommentId", nameof(Comment.CreatedBy));
+        vote.HasOne<User>().WithMany().HasForeignKey(nameof(Vote.CreatedBy)).IsRequired();
         vote.Property(o => o.Type).IsRequired();
         vote.Property(o => o.CreatedAt).IsRequired();
       });

Infrastructure/EntityTypes/LinkEntityType.cs

@@ -14,11 +14,14 @@ namespace HN.Infrastructure.EntityTypes
       builder.Property(o => o.CreatedAt).IsRequired();
       builder.HasIndex(o => o.Url).IsUnique();
 
+      builder.HasOne<User>().WithMany().HasForeignKey(nameof(Link.CreatedBy)).IsRequired();
+
       builder.OwnsMany(o => o.Votes, vote =>
       {
         vote.ToTable("link_votes");
         vote.WithOwner().HasForeignKey("LinkId");
-        vote.HasKey("LinkId");
+        vote.HasKey("LinkId", nameof(Link.CreatedBy));
+        vote.HasOne<User>().WithMany().HasForeignKey(nameof(Vote.CreatedBy)).IsRequired();
         vote.Property(o => o.Type).IsRequired();
         vote.Property(o => o.CreatedAt).IsRequired();
       });

Infrastructure/Migrations/20201211144029_AddCreatedBy.Designer.cs

@@ -0,0 +1,408 @@
+// <auto-generated />
+using System;
+using HN.Infrastructure;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+
+namespace Infrastructure.Migrations
+{
+    [DbContext(typeof(HNDbContext))]
+    [Migration("20201211144029_AddCreatedBy")]
+    partial class AddCreatedBy
+    {
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "5.0.0");
+
+            modelBuilder.Entity("HN.Domain.Comment", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Content")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("TEXT");
+
+                    b.Property<Guid>("CreatedBy")
+                        .HasColumnType("TEXT");
+
+                    b.Property<Guid>("LinkId")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CreatedBy");
+
+                    b.HasIndex("LinkId");
+
+                    b.ToTable("comments");
+                });
+
+            modelBuilder.Entity("HN.Domain.Link", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("TEXT");
+
+                    b.Property<Guid>("CreatedBy")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Url")
+                        .IsRequired()
+                        .HasMaxLength(500)
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CreatedBy");
+
+                    b.HasIndex("Url")
+                        .IsUnique();
+
+                    b.ToTable("links");
+                });
+
+            modelBuilder.Entity("HN.Infrastructure.Role", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("ConcurrencyStamp")
+                        .IsConcurrencyToken()
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Name")
+                        .HasMaxLength(256)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("NormalizedName")
+                        .HasMaxLength(256)
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("NormalizedName")
+                        .IsUnique()
+                        .HasDatabaseName("RoleNameIndex");
+
+                    b.ToTable("AspNetRoles");
+                });
+
+            modelBuilder.Entity("HN.Infrastructure.User", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("TEXT");
+
+                    b.Property<int>("AccessFailedCount")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("ConcurrencyStamp")
+                        .IsConcurrencyToken()
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Email")
+                        .HasMaxLength(256)
+                        .HasColumnType("TEXT");
+
+                    b.Property<bool>("EmailConfirmed")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<bool>("LockoutEnabled")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<DateTimeOffset?>("LockoutEnd")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("NormalizedEmail")
+                        .HasMaxLength(256)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("NormalizedUserName")
+                        .HasMaxLength(256)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("PasswordHash")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("PhoneNumber")
+                        .HasColumnType("TEXT");
+
+                    b.Property<bool>("PhoneNumberConfirmed")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("SecurityStamp")
+                        .HasColumnType("TEXT");
+
+                    b.Property<bool>("TwoFactorEnabled")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("UserName")
+                        .HasMaxLength(256)
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("NormalizedEmail")
+                        .HasDatabaseName("EmailIndex");
+
+                    b.HasIndex("NormalizedUserName")
+                        .IsUnique()
+                        .HasDatabaseName("UserNameIndex");
+
+                    b.ToTable("AspNetUsers");
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityRoleClaim<System.Guid>", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("ClaimType")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("ClaimValue")
+                        .HasColumnType("TEXT");
+
+                    b.Property<Guid>("RoleId")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("RoleId");
+
+                    b.ToTable("AspNetRoleClaims");
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserClaim<System.Guid>", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("ClaimType")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("ClaimValue")
+                        .HasColumnType("TEXT");
+
+                    b.Property<Guid>("UserId")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("UserId");
+
+                    b.ToTable("AspNetUserClaims");
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserLogin<System.Guid>", b =>
+                {
+                    b.Property<string>("LoginProvider")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("ProviderKey")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("ProviderDisplayName")
+                        .HasColumnType("TEXT");
+
+                    b.Property<Guid>("UserId")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("LoginProvider", "ProviderKey");
+
+                    b.HasIndex("UserId");
+
+                    b.ToTable("AspNetUserLogins");
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserRole<System.Guid>", b =>
+                {
+                    b.Property<Guid>("UserId")
+                        .HasColumnType("TEXT");
+
+                    b.Property<Guid>("RoleId")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("UserId", "RoleId");
+
+                    b.HasIndex("RoleId");
+
+                    b.ToTable("AspNetUserRoles");
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserToken<System.Guid>", b =>
+                {
+                    b.Property<Guid>("UserId")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("LoginProvider")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Name")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Value")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("UserId", "LoginProvider", "Name");
+
+                    b.ToTable("AspNetUserTokens");
+                });
+
+            modelBuilder.Entity("HN.Domain.Comment", b =>
+                {
+                    b.HasOne("HN.Infrastructure.User", null)
+                        .WithMany()
+                        .HasForeignKey("CreatedBy")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("HN.Domain.Link", null)
+                        .WithMany()
+                        .HasForeignKey("LinkId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.OwnsMany("HN.Domain.Vote", "Votes", b1 =>
+                        {
+                            b1.Property<Guid>("CommentId")
+                                .HasColumnType("TEXT");
+
+                            b1.Property<Guid>("CreatedBy")
+                                .HasColumnType("TEXT");
+
+                            b1.Property<DateTime>("CreatedAt")
+                                .HasColumnType("TEXT");
+
+                            b1.Property<int>("Type")
+                                .HasColumnType("INTEGER");
+
+                            b1.HasKey("CommentId", "CreatedBy");
+
+                            b1.HasIndex("CreatedBy");
+
+                            b1.ToTable("comment_votes");
+
+                            b1.WithOwner()
+                                .HasForeignKey("CommentId");
+
+                            b1.HasOne("HN.Infrastructure.User", null)
+                                .WithMany()
+                                .HasForeignKey("CreatedBy")
+                                .OnDelete(DeleteBehavior.Cascade)
+                                .IsRequired();
+                        });
+
+                    b.Navigation("Votes");
+                });
+
+            modelBuilder.Entity("HN.Domain.Link", b =>
+                {
+                    b.HasOne("HN.Infrastructure.User", null)
+                        .WithMany()
+                        .HasForeignKey("CreatedBy")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.OwnsMany("HN.Domain.Vote", "Votes", b1 =>
+                        {
+                            b1.Property<Guid>("LinkId")
+                                .HasColumnType("TEXT");
+
+                            b1.Property<Guid>("CreatedBy")
+                                .HasColumnType("TEXT");
+
+                            b1.Property<DateTime>("CreatedAt")
+                                .HasColumnType("TEXT");
+
+                            b1.Property<int>("Type")
+                                .HasColumnType("INTEGER");
+
+                            b1.HasKey("LinkId", "CreatedBy");
+
+                            b1.HasIndex("CreatedBy");
+
+                            b1.ToTable("link_votes");
+
+                            b1.HasOne("HN.Infrastructure.User", null)
+                                .WithMany()
+                                .HasForeignKey("CreatedBy")
+                                .OnDelete(DeleteBehavior.Cascade)
+                                .IsRequired();
+
+                            b1.WithOwner()
+                                .HasForeignKey("LinkId");
+                        });
+
+                    b.Navigation("Votes");
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityRoleClaim<System.Guid>", b =>
+                {
+                    b.HasOne("HN.Infrastructure.Role", null)
+                        .WithMany()
+                        .HasForeignKey("RoleId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserClaim<System.Guid>", b =>
+                {
+                    b.HasOne("HN.Infrastructure.User", null)
+                        .WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserLogin<System.Guid>", b =>
+                {
+                    b.HasOne("HN.Infrastructure.User", null)
+                        .WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserRole<System.Guid>", b =>
+                {
+                    b.HasOne("HN.Infrastructure.Role", null)
+                        .WithMany()
+                        .HasForeignKey("RoleId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("HN.Infrastructure.User", null)
+                        .WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserToken<System.Guid>", b =>
+                {
+                    b.HasOne("HN.Infrastructure.User", null)
+                        .WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

Infrastructure/Migrations/20201211144029_AddCreatedBy.cs

@@ -0,0 +1,178 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace Infrastructure.Migrations
+{
+    public partial class AddCreatedBy : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropPrimaryKey(
+                name: "PK_link_votes",
+                table: "link_votes");
+
+            migrationBuilder.DropPrimaryKey(
+                name: "PK_comment_votes",
+                table: "comment_votes");
+
+            migrationBuilder.AddColumn<Guid>(
+                name: "CreatedBy",
+                table: "links",
+                type: "TEXT",
+                nullable: false,
+                defaultValue: new Guid("00000000-0000-0000-0000-000000000000"));
+
+            migrationBuilder.AddColumn<Guid>(
+                name: "CreatedBy",
+                table: "link_votes",
+                type: "TEXT",
+                nullable: false,
+                defaultValue: new Guid("00000000-0000-0000-0000-000000000000"));
+
+            migrationBuilder.AddColumn<Guid>(
+                name: "CreatedBy",
+                table: "comments",
+                type: "TEXT",
+                nullable: false,
+                defaultValue: new Guid("00000000-0000-0000-0000-000000000000"));
+
+            migrationBuilder.AddColumn<Guid>(
+                name: "CreatedBy",
+                table: "comment_votes",
+                type: "TEXT",
+                nullable: false,
+                defaultValue: new Guid("00000000-0000-0000-0000-000000000000"));
+
+            migrationBuilder.AddPrimaryKey(
+                name: "PK_link_votes",
+                table: "link_votes",
+                columns: new[] { "LinkId", "CreatedBy" });
+
+            migrationBuilder.AddPrimaryKey(
+                name: "PK_comment_votes",
+                table: "comment_votes",
+                columns: new[] { "CommentId", "CreatedBy" });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_links_CreatedBy",
+                table: "links",
+                column: "CreatedBy");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_link_votes_CreatedBy",
+                table: "link_votes",
+                column: "CreatedBy");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_comments_CreatedBy",
+                table: "comments",
+                column: "CreatedBy");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_comment_votes_CreatedBy",
+                table: "comment_votes",
+                column: "CreatedBy");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_comment_votes_AspNetUsers_CreatedBy",
+                table: "comment_votes",
+                column: "CreatedBy",
+                principalTable: "AspNetUsers",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_comments_AspNetUsers_CreatedBy",
+                table: "comments",
+                column: "CreatedBy",
+                principalTable: "AspNetUsers",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_link_votes_AspNetUsers_CreatedBy",
+                table: "link_votes",
+                column: "CreatedBy",
+                principalTable: "AspNetUsers",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_links_AspNetUsers_CreatedBy",
+                table: "links",
+                column: "CreatedBy",
+                principalTable: "AspNetUsers",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_comment_votes_AspNetUsers_CreatedBy",
+                table: "comment_votes");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_comments_AspNetUsers_CreatedBy",
+                table: "comments");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_link_votes_AspNetUsers_CreatedBy",
+                table: "link_votes");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_links_AspNetUsers_CreatedBy",
+                table: "links");
+
+            migrationBuilder.DropIndex(
+                name: "IX_links_CreatedBy",
+                table: "links");
+
+            migrationBuilder.DropPrimaryKey(
+                name: "PK_link_votes",
+                table: "link_votes");
+
+            migrationBuilder.DropIndex(
+                name: "IX_link_votes_CreatedBy",
+                table: "link_votes");
+
+            migrationBuilder.DropIndex(
+                name: "IX_comments_CreatedBy",
+                table: "comments");
+
+            migrationBuilder.DropPrimaryKey(
+                name: "PK_comment_votes",
+                table: "comment_votes");
+
+            migrationBuilder.DropIndex(
+                name: "IX_comment_votes_CreatedBy",
+                table: "comment_votes");
+
+            migrationBuilder.DropColumn(
+                name: "CreatedBy",
+                table: "links");
+
+            migrationBuilder.DropColumn(
+                name: "CreatedBy",
+                table: "link_votes");
+
+            migrationBuilder.DropColumn(
+                name: "CreatedBy",
+                table: "comments");
+
+            migrationBuilder.DropColumn(
+                name: "CreatedBy",
+                table: "comment_votes");
+
+            migrationBuilder.AddPrimaryKey(
+                name: "PK_link_votes",
+                table: "link_votes",
+                column: "LinkId");
+
+            migrationBuilder.AddPrimaryKey(
+                name: "PK_comment_votes",
+                table: "comment_votes",
+                column: "CommentId");
+        }
+    }
+}

Infrastructure/Migrations/HNDbContextModelSnapshot.cs

@@ -29,11 +29,16 @@ namespace Infrastructure.Migrations
                     b.Property<DateTime>("CreatedAt")
                         .HasColumnType("TEXT");
 
+                    b.Property<Guid>("CreatedBy")
+                        .HasColumnType("TEXT");
+
                     b.Property<Guid>("LinkId")
                         .HasColumnType("TEXT");
 
                     b.HasKey("Id");
 
+                    b.HasIndex("CreatedBy");
+
                     b.HasIndex("LinkId");
 
                     b.ToTable("comments");
@@ -48,6 +53,9 @@ namespace Infrastructure.Migrations
                     b.Property<DateTime>("CreatedAt")
                         .HasColumnType("TEXT");
 
+                    b.Property<Guid>("CreatedBy")
+                        .HasColumnType("TEXT");
+
                     b.Property<string>("Url")
                         .IsRequired()
                         .HasMaxLength(500)
@@ -55,6 +63,8 @@ namespace Infrastructure.Migrations
 
                     b.HasKey("Id");
 
+                    b.HasIndex("CreatedBy");
+
                     b.HasIndex("Url")
                         .IsUnique();
 
@@ -254,6 +264,12 @@ namespace Infrastructure.Migrations
 
             modelBuilder.Entity("HN.Domain.Comment", b =>
                 {
+                    b.HasOne("HN.Infrastructure.User", null)
+                        .WithMany()
+                        .HasForeignKey("CreatedBy")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
                     b.HasOne("HN.Domain.Link", null)
                         .WithMany()
                         .HasForeignKey("LinkId")
@@ -265,18 +281,29 @@ namespace Infrastructure.Migrations
                             b1.Property<Guid>("CommentId")
                                 .HasColumnType("TEXT");
 
+                            b1.Property<Guid>("CreatedBy")
+                                .HasColumnType("TEXT");
+
                             b1.Property<DateTime>("CreatedAt")
                                 .HasColumnType("TEXT");
 
                             b1.Property<int>("Type")
                                 .HasColumnType("INTEGER");
 
-                            b1.HasKey("CommentId");
+                            b1.HasKey("CommentId", "CreatedBy");
+
+                            b1.HasIndex("CreatedBy");
 
                             b1.ToTable("comment_votes");
 
                             b1.WithOwner()
                                 .HasForeignKey("CommentId");
+
+                            b1.HasOne("HN.Infrastructure.User", null)
+                                .WithMany()
+                                .HasForeignKey("CreatedBy")
+                                .OnDelete(DeleteBehavior.Cascade)
+                                .IsRequired();
                         });
 
                     b.Navigation("Votes");
@@ -284,21 +311,38 @@ namespace Infrastructure.Migrations
 
             modelBuilder.Entity("HN.Domain.Link", b =>
                 {
+                    b.HasOne("HN.Infrastructure.User", null)
+                        .WithMany()
+                        .HasForeignKey("CreatedBy")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
                     b.OwnsMany("HN.Domain.Vote", "Votes", b1 =>
                         {
                             b1.Property<Guid>("LinkId")
                                 .HasColumnType("TEXT");
 
+                            b1.Property<Guid>("CreatedBy")
+                                .HasColumnType("TEXT");
+
                             b1.Property<DateTime>("CreatedAt")
                                 .HasColumnType("TEXT");
 
                             b1.Property<int>("Type")
                                 .HasColumnType("INTEGER");
 
-                            b1.HasKey("LinkId");
+                            b1.HasKey("LinkId", "CreatedBy");
+
+                            b1.HasIndex("CreatedBy");
 
                             b1.ToTable("link_votes");
 
+                            b1.HasOne("HN.Infrastructure.User", null)
+                                .WithMany()
+                                .HasForeignKey("CreatedBy")
+                                .OnDelete(DeleteBehavior.Cascade)
+                                .IsRequired();
+
                             b1.WithOwner()
                                 .HasForeignKey("LinkId");
                         });