diff --git a/Server/Server/DB/CityDB.cs b/Server/Server/DB/CityDB.cs
index 193d242..aff821b 100644
--- a/Server/Server/DB/CityDB.cs
+++ b/Server/Server/DB/CityDB.cs
@@ -24,8 +24,12 @@ namespace Server.DB
                 using (Context ctx = new Context())
                 {
                     var country = ctx.Countries.FirstOrDefault(c => c.CountryID == city.Country.CountryID);
+
                     ctx.Countries.Attach(country);
+
                     ctx.Cities.Add(city);
+
+                    city.Country = country;
                     ctx.SaveChanges();
                 }
                 return true;
diff --git a/Server/Server/DB/DoctorDB.cs b/Server/Server/DB/DoctorDB.cs
index 22cb29b..dac8743 100644
--- a/Server/Server/DB/DoctorDB.cs
+++ b/Server/Server/DB/DoctorDB.cs
@@ -34,6 +34,11 @@ namespace Server.DB
                     ctx.Countries.Attach(country);
                     ctx.Genders.Attach(gender);
                     ctx.Salutations.Attach(salutation);
+
+                    doctor.City = city;
+                    doctor.Salutation = salutation;
+                    doctor.Gender = gender;
+
                     ctx.Doctors.Add(doctor);
                     ctx.SaveChanges();
                 }
diff --git a/Server/Server/DB/ExamDb.cs b/Server/Server/DB/ExamDb.cs
index 0a56680..456cb24 100644
--- a/Server/Server/DB/ExamDb.cs
+++ b/Server/Server/DB/ExamDb.cs
@@ -47,6 +47,11 @@ namespace Server.DB
                     ctx.Genders.Attach(pGender);
                     ctx.Salutations.Attach(dSalutation);
                     ctx.Salutations.Attach(pSalutation);
+
+                    exam.Doctor = doctor;
+                    exam.Patient = patient;
+                    exam.Strain = strain;
+
                     ctx.Exams.Add(exam);
                     ctx.SaveChanges();
                 }
diff --git a/Server/Server/DB/FoodPlaceDB.cs b/Server/Server/DB/FoodPlaceDB.cs
index 0464758..afc5e77 100644
--- a/Server/Server/DB/FoodPlaceDB.cs
+++ b/Server/Server/DB/FoodPlaceDB.cs
@@ -29,6 +29,9 @@ namespace Server.DB
 
                     ctx.Cities.Attach(city);
                     ctx.Countries.Attach(country);
+
+                    foodplace.City = city;
+
                     ctx.FoodPlaces.Add(foodplace);
                     ctx.SaveChanges();
                 }