Project recommendations

src/Analysim.Core/Entities/Project.cs

@@ -45,6 +45,7 @@ public class Project
         // Logs
         public ICollection<ProjectLog> ProjectLogs { get; set; } = new List<ProjectLog>();
         public ICollection<Publication> Publications { get; set; } = new List<Publication>();
+        public ICollection<ProjectRecommendation> ProjectRecommendations { get; set; } = new List<ProjectRecommendation>();
         public ICollection<ProjectMembershipRequest> ProjectMembershipRequests { get; set; } = new List<ProjectMembershipRequest>();
 
         public int ForkedFromProjectID { get; set; }

src/Analysim.Core/Entities/ProjectRecommendation.cs

@@ -0,0 +1,29 @@
+#nullable enable
+
+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Core.Entities
+{
+    public class ProjectRecommendation
+    {
+        [KeyAttribute]
+        public int ProjectRecommendationID { get; set; }
+
+        [ForeignKey("Project")]
+        public int ProjectID { get; set; }
+        public Project Project { get; set; } = null!;
+
+        [ForeignKey("User")]
+        public int UserID { get; set; }
+        public User User { get; set; } = null!;
+
+        [Required(ErrorMessage = "Recommendation comment is a required field.")]
+        [MaxLength(1000, ErrorMessage = "Maximum length for Recommendation Comment is 1000 characters.")]
+        public string Comment { get; set; } = string.Empty;
+
+        public DateTime CreatedAt { get; set; }
+        public DateTime UpdatedAt { get; set; }
+    }
+}

src/Analysim.Core/Entities/User.cs

@@ -29,6 +29,7 @@ public class User : IdentityUser<int>
 
         // Logs
         public ICollection<ProjectLog> ProjectLogs { get; set; } = new List<ProjectLog>();
+        public ICollection<ProjectRecommendation> ProjectRecommendations { get; set; } = new List<ProjectRecommendation>();
 
         public ICollection<RefreshToken> RefreshTokens { get; set; } = new List<RefreshToken>();
 

src/Analysim.Infrastructure/Data/ApplicationDbContext.cs

@@ -309,6 +309,23 @@ protected override void OnModelCreating(ModelBuilder modelBuilder)
                         .HasForeignKey(pp => pp.ProjectID)
                         .OnDelete(DeleteBehavior.Cascade);
 
+            // One recommendation per user per project
+            modelBuilder.Entity<ProjectRecommendation>()
+                        .HasIndex(pr => new { pr.UserID, pr.ProjectID })
+                        .IsUnique();
+
+            modelBuilder.Entity<Project>()
+                        .HasMany(p => p.ProjectRecommendations)
+                        .WithOne(pr => pr.Project)
+                        .HasForeignKey(pr => pr.ProjectID)
+                        .OnDelete(DeleteBehavior.Cascade);
+
+            modelBuilder.Entity<User>()
+                        .HasMany(u => u.ProjectRecommendations)
+                        .WithOne(pr => pr.User)
+                        .HasForeignKey(pr => pr.UserID)
+                        .OnDelete(DeleteBehavior.Cascade);
+
             // One To Many Relationship (Project -> ProjectMembershipRequest)
             modelBuilder.Entity<Project>()
                         .HasMany(p => p.ProjectMembershipRequests)
@@ -360,6 +377,7 @@ protected override void OnModelCreating(ModelBuilder modelBuilder)
         public DbSet<ProjectLog> ProjectLogs { get; set; }
 
         public DbSet<Publication> Publications { get; set; }
+        public DbSet<ProjectRecommendation> ProjectRecommendations { get; set; }
         public DbSet<ProjectMembershipRequest> ProjectMembershipRequests { get; set; }
         public DbSet<Notification> Notifications { get; set; }
         public DbSet<UserNotificationPreference> UserNotificationPreferences { get; set; }