Allow update without resource version

pkg/api/rest/types.go

@@ -87,3 +87,7 @@ func (svcStrategy) AllowCreateOnUpdate() bool {
 func (svcStrategy) ValidateUpdate(ctx api.Context, obj, old runtime.Object) fielderrors.ValidationErrorList {
 	return validation.ValidateServiceUpdate(old.(*api.Service), obj.(*api.Service))
 }
+
+func (svcStrategy) AllowUnconditionalUpdate() bool {
+	return true
+}

pkg/api/rest/update.go

@@ -40,6 +40,8 @@ type RESTUpdateStrategy interface {
 	// ValidateUpdate is invoked after default fields in the object have been filled in before
 	// the object is persisted.
 	ValidateUpdate(ctx api.Context, obj, old runtime.Object) fielderrors.ValidationErrorList
+	// AllowUnconditionalUpdate returns true if the object can be updated unconditionally (irrespective of the latest resource version), when there is no resource version specified in the object.
+	AllowUnconditionalUpdate() bool
 }
 
 // BeforeUpdate ensures that common operations for all resources are performed on update. It only returns