Coursach/Course/DatabaseImplement/Models/Machine.cs

using Contracts.BindingModels;
using Contracts.ViewModels;
using DataModels.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;

namespace DatabaseImplement.Models
{
	public class Machine : IMachineModel
	{
		public int Id { get; private set; }
		[Required]
		public string Title { get; private set; } = string.Empty;
		[Required]
		public string Country { get; private set; } = string.Empty;
        [Required]
        public DateTime DateCreate { get; set; } = DateTime.Now;
        [Required]
		public int UserId { get; private set; }
		private Dictionary<int, IWorkerModel>? _workerMachines = null;
		[NotMapped]
		public Dictionary<int, IWorkerModel>? WorkerMachines
		{
			get
			{
				if (_workerMachines == null)
				{
					_workerMachines = Workers.ToDictionary(recDP => recDP.WorkerId, recDp => (recDp.Worker as IWorkerModel));
				}
				return _workerMachines;
			}
		}
		[ForeignKey("MachineId")]
		public virtual List<WorkerMachine> Workers { get; set; } = new();
		public virtual Guarantor Guarantor { get; set; }
		[ForeignKey("MachineId")]
		public virtual List<Product> Products { get; set; }
		public static Machine Create(MachineBindingModel model, FactoryGoWorkDatabase context)
		{
			return new Machine()
			{
				Id = model.Id,
				Title = model.Title,
				Country = model.Country,
				UserId = model.UserId,
				Workers = model.MachineWorker.Select(x => new WorkerMachine
				{
					Worker = context.Workers.First(y => y.Id == x.Key),
				}).ToList(),
			};
		}
		public void Update(MachineBindingModel model)
		{
			Title = model.Title;
			Country = model.Country;
		}
		public MachineViewModel GetViewModel => new()
		{
			Id = Id,
			Title = Title,
			Country = Country,
			UserId = UserId,
			WorkerMachines = WorkerMachines
		};
		public void UpdateWorkers(FactoryGoWorkDatabase context, MachineBindingModel model)
		{
			var machineWorkers = context.WorkerMachines.Where(rec => rec.MachineId == model.Id).ToList();
			if (machineWorkers != null && machineWorkers.Count > 0)
			{
				context.WorkerMachines.RemoveRange(machineWorkers.Where(rec => model.MachineWorker.ContainsKey(rec.WorkerId)));
				context.SaveChanges();
			}
			var machine = context.Machines.First(x => x.Id == model.Id);
			foreach (var dp in model.MachineWorker)
			{
				context.WorkerMachines.Add(new WorkerMachine
				{
					Machine = machine,
					Worker = context.Workers.First(x => x.Id == dp.Key)
				});
				context.SaveChanges();
			}
			_workerMachines = null;
		}
	}
}