Создал все классы моделей бд, нужно их реализовать

Polyclinic/PolyclinicDatabaseImplement/Models/Course.cs

@@ -0,0 +1,101 @@
+using PolyclinicContracts.BindingModels;
+using PolyclinicContracts.ViewModels;
+using PolyclinicDataModels.Models;
+using SecuritySystemDatabaseImplement;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace PolyclinicDatabaseImplement.Models
+{
+    public class Course : ICourseModel
+    {
+        public int Id { get; set; }
+        [Required]
+        public int DaysCount { get; set; }
+        [Required]
+        public int PillsPerDay { get; set; }
+        public string Comment { get; set; } = string.Empty;
+        [Required]
+        public int RecipeId { get; set; }
+        public virtual Recipe Recipe { get; set; } = new();
+        [ForeignKey("CourseId")]
+        public virtual List<CourseDiagnose> Diagnoses { get; set; } = new();
+        private Dictionary<int, IDiagnoseModel>? _courseDiagnoses = null;
+        public Dictionary<int, IDiagnoseModel> CourseDiagnoses
+        {
+            get
+            {
+                if (_courseDiagnoses == null)
+                {
+                    _courseDiagnoses = Diagnoses.ToDictionary(
+                        courseDiagnose => courseDiagnose.DiagnoseId,
+                        courseDiagnose => courseDiagnose.Diagnose as IDiagnoseModel
+                    );
+                }
+                return _courseDiagnoses;
+            }
+        }
+
+        public static Course Create(SecuritySystemDatabase context, CourseBindingModel model)
+        {
+            return new Course()
+            {
+                Id = model.Id,
+                DaysCount = model.DaysCount,
+                PillsPerDay = model.PillsPerDay,
+                Comment = model.Comment,
+                RecipeId = model.RecipeId,
+                Diagnoses = model.CourseDiagnoses.Select(courseDiagnose => new CourseDiagnose
+                {
+                    Diagnose = context.Diagnoses.First(diagnose => diagnose.Id == courseDiagnose.Key)
+                }).ToList()
+            };
+        }
+
+        public void Update(CourseBindingModel model)
+        {
+            DaysCount = model.DaysCount;
+            PillsPerDay = model.PillsPerDay;
+            Comment = model.Comment;
+            RecipeId = model.RecipeId;
+        }
+
+        public CourseViewModel GetViewModel => new()
+        {
+            Id = Id,
+            CourseName = CourseName,
+            Price = Price,
+            CourseDiagnoses = CourseDiagnoses
+        };
+
+        public void UpdateDiagnoses(SecuritySystemDatabase context, CourseBindingModel model)
+        {
+            var courseDiagnoses = context.CourseDiagnoses.Where(rec => rec.CourseId == model.Id).ToList();
+            if (courseDiagnoses != null && courseDiagnoses.Count > 0)
+            {
+                // удалили те, которых нет в модели
+                context.CourseDiagnoses.RemoveRange(courseDiagnoses.Where(rec => !model.CourseDiagnoses.ContainsKey(rec.DiagnoseId)));
+                context.SaveChanges();
+                // обновили количество у существующих записей
+                foreach (var updateDiagnose in courseDiagnoses)
+                {
+                    updateDiagnose.Count = model.CourseDiagnoses[updateDiagnose.DiagnoseId].Item2;
+                    model.CourseDiagnoses.Remove(updateDiagnose.DiagnoseId);
+                }
+                context.SaveChanges();
+            }
+            var course = context.Courses.First(x => x.Id == Id);
+            foreach (var pc in model.CourseDiagnoses)
+            {
+                context.CourseDiagnoses.Add(new CourseDiagnose
+                {
+                    Course = course,
+                    Diagnose = context.Diagnoses.First(x => x.Id == pc.Key),
+                    Count = pc.Value.Item2
+                });
+                context.SaveChanges();
+            }
+            _courseDiagnoses = null;
+        }
+    }
+}

Polyclinic/PolyclinicDatabaseImplement/Models/CourseDiagnose.cs

@@ -0,0 +1,15 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace PolyclinicDatabaseImplement.Models
+{
+    public class CourseDiagnose
+    {
+        public int Id { get; set; }
+        [Required]
+        public int CourseId { get; set; }
+        [Required]
+        public int DiagnoseId {  get; set; }
+        public virtual Course Course { get; set; } = new();
+        public virtual Diagnose Diagnose { get; set; } = new();
+    }
+}

Polyclinic/PolyclinicDatabaseImplement/Models/Diagnose.cs

@@ -14,7 +14,7 @@ namespace PolyclinicDatabaseImplement.Models
         [Required]
         public int UserId { get; set; }
         public int Id { get; set; }
-        public virtual User? User { get; set; }
+        public virtual User User { get; set; } = new();
         
         public static Diagnose? Create(DiagnoseBindingModel? model)
         {

Polyclinic/PolyclinicDatabaseImplement/Models/Medicament.cs

@@ -0,0 +1,13 @@
+using PolyclinicDataModels.Models;
+
+namespace PolyclinicDatabaseImplement.Models
+{
+    public class Medicament : IMedicamentModel
+    {
+        public string Name => throw new NotImplementedException();
+        public string Comment => throw new NotImplementedException();
+        public int ProcedureId => throw new NotImplementedException();
+        public int SymptomId => throw new NotImplementedException();
+        public int Id => throw new NotImplementedException();
+    }
+}

Polyclinic/PolyclinicDatabaseImplement/Models/Procedure.cs

@@ -0,0 +1,12 @@
+using PolyclinicDataModels.Models;
+
+namespace PolyclinicDatabaseImplement.Models
+{
+    public class Procedure : IProcedureModel
+    {
+        public string Name => throw new NotImplementedException();
+        public string Comment => throw new NotImplementedException();
+        public Dictionary<int, ICourseModel> ProcedureCourses => throw new NotImplementedException();
+        public int Id => throw new NotImplementedException();
+    }
+}

Polyclinic/PolyclinicDatabaseImplement/Models/ProcedureRecipe.cs

@@ -0,0 +1,6 @@
+namespace PolyclinicDatabaseImplement.Models
+{
+    public class ProcedureRecipe
+    {
+    }
+}

Polyclinic/PolyclinicDatabaseImplement/Models/Recipe.cs

@@ -0,0 +1,12 @@
+using PolyclinicDataModels.Models;
+
+namespace PolyclinicDatabaseImplement.Models
+{
+    public class Recipe : IRecipeModel
+    {
+        public int ProceduresCount { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
+        public string Comment { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
+        public Dictionary<int, IRecipeModel> ProcedureRecipes => throw new NotImplementedException();
+        public int Id => throw new NotImplementedException();
+    }
+}

Polyclinic/PolyclinicDatabaseImplement/Models/Symptom.cs

@@ -0,0 +1,12 @@
+using PolyclinicDataModels.Models;
+
+namespace PolyclinicDatabaseImplement.Models
+{
+    public class Symptom : ISymptomModel
+    {
+        public string Name => throw new NotImplementedException();
+        public string Comment => throw new NotImplementedException();
+        public Dictionary<int, IDiagnoseModel> SymptomDiagnoses => throw new NotImplementedException();
+        public int Id => throw new NotImplementedException();
+    }
+}

Polyclinic/PolyclinicDatabaseImplement/Models/SymptomDiagnose.cs

@@ -0,0 +1,6 @@
+namespace PolyclinicDatabaseImplement.Models
+{
+    public class SymptomDiagnose
+    {
+    }
+}

Polyclinic/PolyclinicDatabaseImplement/Models/SymptomRecipe.cs

@@ -0,0 +1,6 @@
+namespace PolyclinicDatabaseImplement.Models
+{
+    public class SymptomRecipe
+    {
+    }
+}