new update

ProtRPP/SchoolAgainStudyDataBaseImplements/Models/Diy.cs

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+using SchoolAgainStudyContracts.BindingModel;
+using SchoolAgainStudyContracts.ViewModel;
+using SchoolAgainStudyDataModels.Models;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Linq;
+using System.Security.Claims;
+using System.Text;
+using System.Threading.Tasks;
+using System.Xml.Linq;
+
+namespace SchoolAgainStudyDataBaseImplements.Models
+{
+    public class Diy : IDiy
+    {
+        [Required]
+        public string Title { get; set; } = string.Empty;
+        [Required]
+        public string Description { get; set; } = string.Empty;
+        [Required]
+        public DateTime DateCreate { get; set; } 
+        [Required]
+        public int TaskId { get; set; }
+        public string TaskName { get; set; } = string.Empty;
+        public int StudentId { get; set; }
+        private Dictionary<int, IInterest>? _DiyInterests = null;
+        [NotMapped]
+        public Dictionary<int, IInterest> DiyInterests {
+            get
+            {
+                if (_DiyInterests == null)
+                {
+                    _DiyInterests = Interests
+                            .ToDictionary(recPC => recPC.InterestId, recPC => (recPC.Interest as IInterest));
+                }
+                return _DiyInterests;
+            }
+        }
+
+        public int Id { get; set; }
+        [ForeignKey("DiyId")]
+        public virtual List<DiyInterest> Interests { get; set; } = new();
+        public static Diy Create(SchoolDataBase context, DiyBindingModel model)
+        {
+            return new Diy()
+            {
+                Id = model.Id,
+                Title = model.Title,
+                Description = model.Description,
+               DateCreate = model.DateCreate,
+               TaskId = model.TaskId,
+               TaskName = model.TaskName,
+               StudentId = model.StudentId,
+               Interests = model.DiyInterests.Select(x => new DiyInterest
+                {
+                    Interest = context.Interests.First(y => y.Id == x.Key),
+                }).ToList()
+            };
+        }
+
+        public void Update(DiyBindingModel model)
+        {
+            Title = model.Title;
+            Description = model.Description;
+        }
+
+        public DiyViewModel GetViewModel => new()
+        {
+            Id = Id,
+            Title=Title,
+            Description=Description,
+            DateCreate = DateCreate,
+            TaskId = TaskId,
+            TaskName = TaskName,
+            StudentId = StudentId,
+            DiyInterests=DiyInterests
+        };
+
+        public void UpdateInterests(SchoolDataBase context, DiyBindingModel model)
+        {
+            var diyInterests = context.DiyInterests.Where(rec => rec.DiyId == model.Id).ToList();
+            if (diyInterests != null && diyInterests.Count > 0)
+            {
+                context.DiyInterests.RemoveRange(diyInterests.Where(rec => !model.DiyInterests.ContainsKey(rec.InterestId)));
+                context.SaveChanges();
+
+                foreach (var updateInterest in diyInterests)
+                {
+                    model.DiyInterests.Remove(updateInterest.InterestId);
+                }
+                context.SaveChanges();
+            }
+            var diy = context.Diys.First(x => x.Id == Id);
+            foreach (var pc in model.DiyInterests)
+            {
+                context.DiyInterests.Add(new DiyInterest
+                {
+                    Diy = diy,
+                    Interest = context.Interests.First(x => x.Id == pc.Key),
+                });
+                context.SaveChanges();
+            }
+            _DiyInterests = null;
+        }
+    }
+}