diff --git a/Polyclinic/PolyclinicDatabaseImplement/Models/Course.cs b/Polyclinic/PolyclinicDatabaseImplement/Models/Course.cs
index 1dd6339..3f32268 100644
--- a/Polyclinic/PolyclinicDatabaseImplement/Models/Course.cs
+++ b/Polyclinic/PolyclinicDatabaseImplement/Models/Course.cs
@@ -72,32 +72,25 @@ namespace PolyclinicDatabaseImplement.Models
 
         public void UpdateDiagnoses(PolyclinicDatabase 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;
+            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();
+            }
+            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),
+                });
+                context.SaveChanges();
+            }
+            _courseDiagnoses = null;
         }
     }
 }
diff --git a/Polyclinic/PolyclinicDatabaseImplement/Models/Symptom.cs b/Polyclinic/PolyclinicDatabaseImplement/Models/Symptom.cs
index ac28741..59f59ba 100644
--- a/Polyclinic/PolyclinicDatabaseImplement/Models/Symptom.cs
+++ b/Polyclinic/PolyclinicDatabaseImplement/Models/Symptom.cs
@@ -1,12 +1,87 @@
-using PolyclinicDataModels.Models;
+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 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();
+        [Required]
+        public string Name { get; set; } = string.Empty;
+        [Required]
+        public string Comment { get; set; } = string.Empty;
+        [ForeignKey("SymptomId")]
+        public virtual List<SymptomDiagnose> Diagnoses { get; set; } = new();
+        private Dictionary<int, IDiagnoseModel>? _symptomDiagnoses = null;
+        [NotMapped]
+        public Dictionary<int, IDiagnoseModel> SymptomDiagnoses
+        {
+            get
+            {
+                if (_symptomDiagnoses == null)
+                {
+                    _symptomDiagnoses = Diagnoses.ToDictionary(
+                        symptomDiagnose => symptomDiagnose.DiagnoseId,
+                        symptomDiagnose => symptomDiagnose.Diagnose as IDiagnoseModel
+                    );
+                }
+                return _symptomDiagnoses;
+            }
+        }
+        public int Id { get; set; }
+
+        public static Symptom Create(PolyclinicDatabase context, SymptomBindingModel model)
+        {
+            return new Symptom()
+            {
+                Id = model.Id,
+                Name = model.Name,
+                Comment = model.Comment,
+                Diagnoses = model.SymptomDiagnoses.Select(symptomDiagnose => new SymptomDiagnose
+                {
+                    Diagnose = context.Diagnoses.First(diagnose => diagnose.Id == symptomDiagnose.Key)
+                }).ToList()
+            };
+        }
+
+        public void Update(SymptomBindingModel model)
+        {
+            Comment = model.Comment;
+            Name = model.Name;
+        }
+
+        public SymptomViewModel GetViewModel => new()
+        {
+            Id = Id,
+            Comment = Comment,
+            Name = Name,
+            SymptomDiagnoses = SymptomDiagnoses
+        };
+
+        public void UpdateDiagnoses(PolyclinicDatabase context, SymptomBindingModel model)
+        {
+            var symptomDiagnoses = context.SymptomDiagnoses.Where(rec => rec.SymptomId == model.Id).ToList();
+            if (symptomDiagnoses != null && symptomDiagnoses.Count > 0)
+            {
+                // удалили те, которых нет в модели
+                context.SymptomDiagnoses.RemoveRange(symptomDiagnoses
+                    .Where(rec => !model.SymptomDiagnoses.ContainsKey(rec.DiagnoseId)));
+                context.SaveChanges();
+            }
+            var course = context.Symptomes.First(x => x.Id == Id);
+            foreach (var pc in model.SymptomDiagnoses)
+            {
+                context.SymptomDiagnoses.Add(new SymptomDiagnose
+                {
+                    Symptom = course,
+                    Diagnose = context.Diagnoses.First(x => x.Id == pc.Key),
+                });
+                context.SaveChanges();
+            }
+            _symptomDiagnoses = null;
+        }
     }
 }
diff --git a/Polyclinic/PolyclinicDatabaseImplement/Models/SymptomDiagnose.cs b/Polyclinic/PolyclinicDatabaseImplement/Models/SymptomDiagnose.cs
index 6d75305..7d8a399 100644
--- a/Polyclinic/PolyclinicDatabaseImplement/Models/SymptomDiagnose.cs
+++ b/Polyclinic/PolyclinicDatabaseImplement/Models/SymptomDiagnose.cs
@@ -1,6 +1,15 @@
-namespace PolyclinicDatabaseImplement.Models
+using System.ComponentModel.DataAnnotations;
+
+namespace PolyclinicDatabaseImplement.Models
 {
     public class SymptomDiagnose
     {
+        public int Id { get; set; }
+        [Required]
+        public int SymptomId { get; set; }
+        [Required]
+        public int DiagnoseId { get; set; }
+        public virtual Symptom Symptom { get; set; } = new();
+        public virtual Diagnose Diagnose { get; set; } = new();
     }
 }