UsersController.cs

public class UsersController : ControllerBase
{
    private readonly IUnitOfWork _unitOfWork;

    public UsersController(IUnitOfWork unitOfWork)
    {
        _unitOfWork = unitOfWork;
    }

    // GET: api/Users
    [HttpGet]
    public ActionResult<IEnumerable<User>> GetUsers()
    {
        return _unitOfWork.Repository<User>().Find(new UsersWithRecipesAndIngredientsSpecification()).ToList();
    }

    // GET: api/Users/5
    [HttpGet("{id}")]
    public ActionResult<User> GetUser(int id)
    {
        var user = _unitOfWork.Repository<User>().Find(new UsersWithRecipesAndIngredientsSpecification(id)).SingleOrDefault();

        if (user == null)
        {
            return NotFound();
        }

        return user;
    }

    //// PUT: api/Users/5
    [HttpPut("{id}")]
    public IActionResult PutUser(int id, User user)
    {
        if (id != user.Id)
        {
            return BadRequest();
        }

        _unitOfWork.Repository<User>().Update(user);

        try
        {
            _unitOfWork.Complete();
        }
        catch (DbUpdateConcurrencyException)
        {
            if(!_unitOfWork.Repository<User>().Contains(x => x.Id == id))
            {
                return NotFound();
            }
            else
            {
                throw;
            }
        }

        return NoContent();
    }

    // POST: api/Users
    [HttpPost]
    public ActionResult<User> PostUser(User user)
    {
        _unitOfWork.Repository<User>().Add(user);
        _unitOfWork.Complete();

        return CreatedAtAction("GetUser", new { id = user.Id }, user);
    }

    // DELETE: api/Users/5
    [HttpDelete("{id}")]
    public ActionResult<User> DeleteUser(int id)
    {
        var user = _unitOfWork.Repository<User>().FindById(id);
        if (user == null)
        {
            return NotFound();
        }

        _unitOfWork.Repository<User>().Remove(user);
        _unitOfWork.Complete();

        return user;
    }
}