Refactor code to remove nullable types and ensure required properties are accessed directly

Author: niteshsinghal85

src/Examples/OpenApiNSwagClientExample/PeopleMessageFormatter.cs

@@ -36,9 +36,9 @@ private static string WritePeople(ApiResponse<PersonCollectionResponseDocument?>
 
     private static void WritePerson(DataInPersonResponse person, ICollection<ResourceInResponse> includes, StringBuilder builder)
     {
-        ICollection<TodoItemIdentifierInResponse> assignedTodoItems = person.Relationships?.AssignedTodoItems?.Data ?? [];
+        ICollection<TodoItemIdentifierInResponse> assignedTodoItems = person.Relationships.AssignedTodoItems?.Data ?? [];
 
-        builder.AppendLine($"  Person {person.Id}: {person.Attributes?.DisplayName} with {assignedTodoItems.Count} assigned todo-items:");
+        builder.AppendLine($"  Person {person.Id}: {person.Attributes.DisplayName} with {assignedTodoItems.Count} assigned todo-items:");
         WriteRelatedTodoItems(assignedTodoItems, includes, builder);
     }
 
@@ -48,9 +48,9 @@ private static void WriteRelatedTodoItems(IEnumerable<TodoItemIdentifierInRespon
         foreach (TodoItemIdentifierInResponse todoItemIdentifier in todoItemIdentifiers)
         {
             DataInTodoItemResponse includedTodoItem = includes.OfType<DataInTodoItemResponse>().Single(include => include.Id == todoItemIdentifier.Id);
-            ICollection<TagIdentifierInResponse> tags = includedTodoItem.Relationships?.Tags?.Data ?? [];
+            ICollection<TagIdentifierInResponse> tags = includedTodoItem.Relationships.Tags?.Data ?? [];
 
-            builder.AppendLine($"    TodoItem {includedTodoItem.Id}: {includedTodoItem.Attributes?.Description} with {tags.Count} tags:");
+            builder.AppendLine($"    TodoItem {includedTodoItem.Id}: {includedTodoItem.Attributes.Description} with {tags.Count} tags:");
             WriteRelatedTags(tags, includes, builder);
         }
     }
@@ -60,7 +60,7 @@ private static void WriteRelatedTags(IEnumerable<TagIdentifierInResponse> tagIde
         foreach (TagIdentifierInResponse tagIdentifier in tagIdentifiers)
         {
             DataInTagResponse includedTag = includes.OfType<DataInTagResponse>().Single(include => include.Id == tagIdentifier.Id);
-            builder.AppendLine($"      Tag {includedTag.Id}: {includedTag.Attributes?.Name}");
+            builder.AppendLine($"      Tag {includedTag.Id}: {includedTag.Attributes.Name}");
         }
     }
 }

src/Examples/OpenApiNSwagClientExample/Worker.cs

@@ -165,7 +165,7 @@ private async Task SendOperationsRequestAsync(CancellationToken cancellationToke
 
         ApiResponse<OperationsResponseDocument> operationsResponse = await _apiClient.PostOperationsAsync(operationsRequest, cancellationToken);
 
-        var newTodoItem = (DataInTodoItemResponse)operationsResponse.Result.Atomic_results.ElementAt(3).Data!;
-        Console.WriteLine($"Created todo-item with ID {newTodoItem.Id}: {newTodoItem.Attributes!.Description}.");
+        var newTodoItem = (DataInTodoItemResponse)operationsResponse.Result.Atomic_results.ElementAt(3).Data;
+        Console.WriteLine($"Created todo-item with ID {newTodoItem.Id}: {newTodoItem.Attributes.Description}.");
     }
 }

test/OpenApiTests/AtomicOperations/OperationsFakers.cs

@@ -45,11 +45,18 @@ public OperationsFakers(IServiceProvider serviceProvider)
             .MakeDeterministic()
             .CustomInstantiator(faker =>
             {
-                var dbContext = ResolveDbContext(serviceProvider);
+                OperationsDbContext dbContext = ResolveDbContext(serviceProvider);
+
                 return new Enrollment(dbContext)
                 {
-                    Student = new Student { Name = faker.Name.FullName() },
-                    Course = new Course { Subject = faker.Commerce.Department() },
+                    Student = new Student
+                    {
+                        Name = faker.Name.FullName()
+                    },
+                    Course = new Course
+                    {
+                        Subject = faker.Commerce.Department()
+                    },
                     EnrolledAt = faker.Date.PastDateOnly(),
                     GraduatedAt = faker.Date.RecentDateOnly()
                 };