Change Update method on MySql handlers

CoviDok/Data/MySQL/MySqlAssistantHandler.cs

@@ -20,8 +20,7 @@ namespace CoviDok.Data.MySQL
 
         public async Task SetAssistant(int id, Assistant value)
         {
-            Assistant ast = new Assistant { Id = id };
-            context.Attach(ast);
+            Assistant ast = await context.Assistants.FindAsync(id);
             context.Entry(ast).State = EntityState.Modified;
             PropertyCopier<Assistant>.Copy(value, ast);
             await context.SaveChangesAsync();            

CoviDok/Data/MySQL/MySqlCaseHandler.cs

@@ -76,8 +76,7 @@ namespace CoviDok.Data.MySQL
 
         public async Task UpdateCase(int id, Case Case, Update update)
         {
-            Case c = new Case { Id = id };
-            context.Attach(c);
+            Case c = await context.Cases.FindAsync(id);
             context.Entry(c).State = Microsoft.EntityFrameworkCore.EntityState.Modified;
             string[] forbidden = { "Updates" };
             PropertyCopier<Case>.Copy(Case, c, forbidden);

CoviDok/Data/MySQL/MySqlChildHandler.cs

@@ -30,8 +30,7 @@ namespace CoviDok.Data.MySQL
 
         public async Task UpdateChild(int id, Child newData)
         {
-            Child child = new Child { Id = id };
-            context.Attach(child);
+            Child child = await context.Children.FindAsync(id);
             context.Entry(child).State = Microsoft.EntityFrameworkCore.EntityState.Modified;
             PropertyCopier<Child>.Copy(newData, child);
             await context.SaveChangesAsync();

CoviDok/Data/MySQL/MySqlDoctorHandler.cs

@@ -52,8 +52,7 @@ namespace CoviDok.Data.MySQL
 
         public async Task UpdateDoctor(int id, Doctor value)
         {
-            Doctor doctor = new Doctor { Id = id };
-            context.Attach(doctor);
+            Doctor doctor = await context.Doctors.FindAsync(id);
             context.Entry(doctor).State = Microsoft.EntityFrameworkCore.EntityState.Modified;
             PropertyCopier<Doctor>.Copy(value, doctor);
             await context.SaveChangesAsync();

CoviDok/Data/MySQL/MySqlParentHandler.cs

@@ -29,8 +29,7 @@ namespace CoviDok.Data.MySQL
 
         public async Task UpdateParent(int id, Parent value)
         {
-            Parent Parent = new Parent { Id = id };
-            context.Attach(Parent);
+            Parent Parent = await context.Parents.FindAsync(id);
             context.Entry(Parent).State = Microsoft.EntityFrameworkCore.EntityState.Modified;
             PropertyCopier<Parent>.Copy(value, Parent);
             await context.SaveChangesAsync();