How to remove nested object with EF. ASP.NET MVC 5

Question

I have admin page and have a logic to delete item but for some reason it doesn't work. I have model "Item" and "CartItem".

Item

public class Item : BaseEntity
    {
        [Required]
        [Display(Name = "Item Photo")]
        public string ItemPhoto { get; set; }
        [Required]
        [Display(Name = "Item Type")]
        public string ItemType { get; set; }
        [Required]
        [Display(Name = "Item Name")]
        public string Name { get; set; }
        [Required]
        [Display(Name = "Item Color")]
        public string Color { get; set; }
        [Required]
        [Display(Name = "Item Size")]
        public string Size { get; set; }
        [Required]
        [Display(Name = "Item Material Type")]
        public string MaterialType { get; set; }
        [Required]
        [Display(Name = "Designed For")]
        public string DesignedFor { get; set; }
        [Required]
        [Display(Name = "Item Price")]
        public double Price { get; set; }
        [Required]
        [Display(Name = "Item Description")]
        public string Description { get; set; }
    }

CartItem

public class CartItem : BaseEntity
    {
        public Item Item { get; set; }
        public int? UserId { get; set; }
        [ForeignKey("UserId")]
        public User User { get; set; }
        public int Quantity { get; set; }
    }

Controller

[HttpPost]
        [ValidateAntiForgeryToken]
        public async Task<IActionResult> DeleteItemPost(int id)
        {
            var item = await _itemRepo.ReadByIdAsync(id);
            if (item == null)
            {
                return NotFound();
            }

            await _itemRepo.DeleteAsync(item);
            return RedirectToAction("ReadItems");
        }

When i check with debugger everything works fine but item is still in database. After long time of searching i thought that problem was the "CartItem" Model, because "Item" is connected with foreign key. So i am not sure what is the problem here, i don't get any exceptions, any errors or something like that, everything works fine but the object doesn't remove

Repository

using Microsoft.EntityFrameworkCore;
using RandApp.Data;
using RandApp.Models;
using RandApp.Repositories.Abstraction;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace RandApp.Repositories
{
    public class Repository<T> : IRepository<T> where T : BaseEntity
    {
        private readonly ApplicationDbContext _db = default;
        private readonly DbSet<T> _entity = default;
        public Repository(ApplicationDbContext db)
        {
            _db = db;
            _entity = _db.Set<T>();
        }
        public async Task<bool> CreateAsync(T item)
        {
            _entity.Add(item);
            return await SaveChangesAsync();
        }

        public async Task<bool> DeleteAsync(T item)
        {
            _entity.Remove(item);
            return await SaveChangesAsync();
        }

        public async Task<IEnumerable<T>> ReadAsync()
        {
            return await _entity.ToListAsync();
        }

        public async Task<T> ReadByIdAsync(int? id)
        {
            return await _entity.FirstOrDefaultAsync(o => o.Id == id);
        }

        public async Task<bool> UpdateAsync(T item)
        {
            _entity.Update(item);
            return await SaveChangesAsync();
        }

        public async Task<bool> SaveChangesAsync()
        {
            try
            {
                return (await _db.SaveChangesAsync()) >= 0;
            }
            catch
            {
                return false;
            }
        }

        public DbSet<T> Get()
        {
            return _entity;
        }
    }
}

Answer 1

I see the codes swallows the exception via the try/catch in SavesChangesAsync and returns false. I would do the following:

1. Nuke the try/catch. Or, log any exceptions so there is visibility
2. Check the return value. If the value is false, something is wrong with the db connection