CRUD operations entity framework core code first many to many example

different files.cs

... контекст ...
    
... моделі ...

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Repositories / PersonRepository.cs:

public class PersonRepository
{
    public void GetAllPeople()
    {
        using var context = new ApplicationDbContext();
        var people = context.People?.Include(p => p.Hobbies).ToList();
        foreach (var person in people!)
        {
            Console.WriteLine($"{person.Name}");
            foreach (var hobby in person.Hobbies)
            {
                Console.WriteLine($" - Хобі: {hobby.Name}");
            }
        }
    }

    public void AddPerson(string name, List<string> hobbies)
    {
        using var context = new ApplicationDbContext();
        var person = new Person { Name = name };
        foreach (var hobbyName in hobbies)
        {
            var hobby = context.Hobbies?.FirstOrDefault(h => h.Name == hobbyName) ?? new Hobby { Name = hobbyName };
            person.Hobbies.Add(hobby);
        }
        context.People?.Add(person);
        context.SaveChanges();
        Console.WriteLine($"Людина {name} додана!");
    }

    public void UpdatePersonHobbies(string personName, List<string> newHobbies)
    {
        using var context = new ApplicationDbContext();
        var person = context.People?.Include(p => p.Hobbies).FirstOrDefault(p => p.Name == personName);
        if (person == null)
        {
            Console.WriteLine($"Людину з ім'ям {personName} не знайдено.");
            return;
        }
        person.Hobbies.Clear();
        foreach (var hobbyName in newHobbies)
        {
            var hobby = context.Hobbies?.FirstOrDefault(h => h.Name == hobbyName) ?? new Hobby { Name = hobbyName };
            person.Hobbies.Add(hobby);
        }
        context.SaveChanges();
        Console.WriteLine($"Хобі {personName} оновлено!");
    }

    public void DeletePerson(string personName)
    {
        using var context = new ApplicationDbContext();
        var person = context.People?.Include(p => p.Hobbies).FirstOrDefault(p => p.Name == personName);
        if (person == null)
        {
            Console.WriteLine($"Людину з ім'ям {personName} не знайдено.");
            return;
        }
        context.People?.Remove(person);
        context.SaveChanges();
        Console.WriteLine($"Людину {personName} видалено!");
    }
}

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Program.cs:

using EFCoreCodeFirst.Repositories;
using Microsoft.EntityFrameworkCore;

namespace EFCoreCodeFirst
{
    class Program
    {
        static async Task Main()
        {
            Console.Title = "Міграції";
            Console.OutputEncoding = System.Text.Encoding.UTF8;

            await using var db = new AppDbContext();

            Console.WriteLine("Перевірка та застосування міграцій...");
            await db.Database.MigrateAsync();
            Console.WriteLine("Міграції застосовані (або вже були актуальні).\n");

            var repo = new PersonRepository();
            repo.AddPerson("Олександр", new List<string> { "Футбол", "Читання" });
            repo.AddPerson("Артем", new List<string> { "Малювання", "Подорожі" });
            repo.GetAllPeople();
            repo.UpdatePersonHobbies("Олександр", new List<string> { "Готування", "Подорожі" });
            repo.GetAllPeople();
        }
    }
}