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CarCenterDatabaseImplement/Models/Requirement.cs

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+using CarCenterContracts.BindingModels;
+using CarCenterContracts.Extensions;
+using CarCenterContracts.ViewModels;
+using CarCenterDataModels;
+using System.ComponentModel.DataAnnotations;
+using CarCenterDataModels.ProxyModels;
+
+namespace CarCenterDatabaseImplement.Models
+{
+    public class Requirement : IRequirementModel
+    {
+        [Required]
+        public int DirectorId { get; private set; }
+
+        [Required]
+        public string NameOfRequirement { get; private set; } = string.Empty;
+
+        public int Id { get; private set; }
+
+        [Required]
+        public double Price { get; private set; }
+
+        private Dictionary<int, RequirementByCarModel>? _cachedCars;
+
+        public Dictionary<int, RequirementByCarModel> CarsModels => 
+            _cachedCars ??= Cars.Select(x => (RequirementByCarModel)x).ToDictionary(x => x.CarId, x => x);
+
+        [Required]
+        public Director? Director { get; private set; }
+
+        [Required] 
+        public List<RequirementByCar> Cars { get; private set; } = new();
+
+        public static Requirement Create(RequirementBindingModel model) => model.CastWithCommonProperties<Requirement, RequirementBindingModel>();
+
+        public static implicit operator RequirementViewModel(Requirement? model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException("Возникла ошибка при попытки получить View-модель из null-объекта", nameof(model));
+            }
+            model._cachedCars = null;
+            var result = model.CastWithCommonProperties<RequirementViewModel, Requirement>();
+            result.DirectorLogin = model.Director?.Login ?? string.Empty;
+            return result;
+        }
+
+        public void Update(RequirementBindingModel model)
+        {
+            Price = model.Price;
+        }
+
+        /// <summary>
+        /// Привязка требований к дисциплиным
+        /// </summary>
+        public void UpdateCars(CarCenterDb context, RequirementBindingModel model)
+        {
+            var oldCars = context.RequirementByCars.Where(x => x.CarId == model.Id).ToDictionary(x => x.CarId, x => x);
+            var newCars = model.CarsModels.ToDictionary(
+                x => x.Key,
+                x =>
+                {
+                    var res = x.Value.CastWithCommonProperties<RequirementByCar, RequirementByCarModel>();
+                    res.RequirementId = model.Id;
+                    res.CarId = x.Key;
+                    return res;
+                });
+            context.RemoveRange(oldCars.Where(x => !newCars.ContainsKey(x.Key)).Select(x => x.Value));
+            context.SaveChanges();
+            context.AddRange   (newCars.Where(x => !oldCars.ContainsKey(x.Key)).Select(x => x.Value));
+            oldCars.Where(x => newCars.ContainsKey(x.Key))
+                .Select(x => x.Value).ToList()
+                .ForEach(x => x.Count = newCars[x.CarId].Count);
+            context.SaveChanges();
+            _cachedCars = null;
+        }
+    }
+}