prevent flattener from generating when writeOnly is set on root fields

Author: BBBmau

mmv1/api/resource.go

@@ -1223,7 +1223,7 @@ func (r Resource) InIdFormat(prop Type) bool {
 // Functions used to create slices of resource properties that could not otherwise be called from within generating templates.
 func (r Resource) ReadProperties() []*Type {
 	return google.Reject(r.GettableProperties(), func(p *Type) bool {
-		return p.IgnoreRead
+		return p.IgnoreRead || p.WriteOnly
 	})
 }