Реализовал работу с таблицей связи на примере ученика

ElectronicDiary/ElectronicDiaryPostgresImplementation/WorkImplementation/TeacherWork.cs

@@ -6,9 +6,9 @@ namespace ElectronicDiaryPostgresImplementation.WorkImplementation
 {
     public class TeacherWork : ITeacherWork
     {
-        private readonly SubjectWork _subjectWork;
+        private readonly ISubjectWork _subjectWork;
 
-        public TeacherWork(SubjectWork subjectWork)
+        public TeacherWork(ISubjectWork subjectWork)
         {
             _subjectWork = subjectWork;
         }