completed

Phone Book/Phone Book.slnx

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+<Solution>
+  <Project Path="Phone Book/PhoneBook.csproj" />
+</Solution>

Phone Book/Phone Book/CategoryController.cs

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+using Microsoft.EntityFrameworkCore;
+using Phone_Book.Models;
+using Spectre.Console;
+
+namespace PhoneBook
+{
+    internal class CategoryController
+    {
+        public void CreateCategory(Category userCategory)
+        {
+            using var db = new ContactContext();
+            db.Categories.Add(userCategory);
+
+            SaveChanges(db);
+        }
+
+        public List<Category> GetAllCategories()
+        {
+            using var db = new ContactContext();
+            List<Category> categories = db.Categories.ToList();
+            return categories;
+        }
+
+        public void UpdateCategory(Category userCategory)
+        {
+            using var db = new ContactContext();
+            db.Categories.Update(userCategory);
+
+            SaveChanges(db);
+        }
+
+        public void DeleteCategory(Category userCategory)
+        {
+            using var db = new ContactContext();
+            db.Categories.Remove(userCategory);
+
+            SaveChanges(db);
+        }
+
+        public void SaveChanges(ContactContext db)
+        {
+            try
+            {
+                db.SaveChanges();
+            }
+            catch (DbUpdateConcurrencyException)
+            {
+                AnsiConsole.MarkupLine("[Red]ERROR [/]Couldn't save changes");
+                Environment.Exit(0);
+            }
+            catch (DbUpdateException)
+            {
+                AnsiConsole.MarkupLine("[Red]ERROR [/]Couldn't save changes");
+                Environment.Exit(0);
+            }
+        }
+    }
+}

Phone Book/Phone Book/ContactContext.cs

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+using Microsoft.EntityFrameworkCore;
+using Phone_Book.Models;
+using PhoneBook.Models;
+
+namespace PhoneBook
+{
+    public class ContactContext : DbContext
+    {
+        public DbSet<Contact> Contacts { get; set; }
+        public DbSet<Category> Categories { get; set; }
+
+        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        {
+            optionsBuilder.UseSqlServer("Data Source=localhost; Initial Catalog=PhoneBook; Integrated Security=True; TrustServerCertificate=True;");
+        }
+
+        protected override void OnModelCreating(ModelBuilder modelBuilder)
+        {
+            modelBuilder.Entity<Contact>().HasOne(contact => contact.Category).WithMany(category => category.Contacts).HasForeignKey(contact => contact.CategoryId).OnDelete(DeleteBehavior.Cascade);
+
+            modelBuilder.Entity<Contact>().HasData(
+                new Contact { CategoryId = 2, Id = 1, PhoneNumber = "934568035", Email = "johnjohnson@gmail.com", ContactName = "John" },
+                new Contact { CategoryId = 1, Id = 2, PhoneNumber = "324532653", Email = "jankowalski@yahoo.com", ContactName = "Jan" },
+                new Contact { CategoryId = 1, Id = 3, PhoneNumber = "934568035", Email = "karen609@outlook.com", ContactName = "Karen" });
+            modelBuilder.Entity<Category>().HasData(
+                new Category { Id = 1, Name = "Friends" },
+                new Category { Id = 2, Name = "Family" });
+        }
+    }
+}

Phone Book/Phone Book/ContactController.cs

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+using Microsoft.EntityFrameworkCore;
+using PhoneBook.Models;
+using Spectre.Console;
+
+namespace PhoneBook
+{
+    internal class ContactController
+    {
+        public void CreateContact(Contact userContact)
+        {
+            using var db = new ContactContext();
+            db.Contacts.Add(userContact);
+
+            SaveChanges(db);
+        }
+
+        public List<Contact> GetAllContacts()
+        {
+            using var db = new ContactContext();
+            List<Contact> contacts = db.Contacts.Include(contact => contact.Category).ToList();
+            return contacts;
+        }
+
+        public void UpdateContact(Contact userContact)
+        {
+            using var db = new ContactContext();
+            db.Contacts.Update(userContact);
+
+            SaveChanges(db);
+        }
+
+        public void DeleteContact(Contact userContact)
+        {
+            using var db = new ContactContext();
+            db.Contacts.Remove(userContact);
+
+            SaveChanges(db);
+        }
+
+        public void SaveChanges(ContactContext db)
+        {
+            try
+            {
+                db.SaveChanges();
+            }
+            catch (DbUpdateConcurrencyException)
+            {
+                AnsiConsole.MarkupLine("[Red]ERROR [/]Couldn't save changes");
+                Environment.Exit(0);
+            }
+            catch (DbUpdateException)
+            {
+                AnsiConsole.MarkupLine("[Red]ERROR [/]Couldn't save changes");
+                Environment.Exit(0);
+            }
+        }
+    }
+}