Merge pull request #67686 from imroc/update-sample-controller-readme

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

update sample-controller README

Kubernetes-commit: 405eecad6dde9ab24b770fe583da51b9fd7c6941

vendor/k8s.io/apimachinery/pkg/apis/meta/v1/unstructured/unstructured.go

@@ -179,6 +179,11 @@ func (u *Unstructured) GetOwnerReferences() []metav1.OwnerReference {
 }
 
 func (u *Unstructured) SetOwnerReferences(references []metav1.OwnerReference) {
+	if references == nil {
+		RemoveNestedField(u.Object, "metadata", "ownerReferences")
+		return
+	}
+
 	newReferences := make([]interface{}, 0, len(references))
 	for _, reference := range references {
 		out, err := runtime.DefaultUnstructuredConverter.ToUnstructured(&reference)
@@ -212,6 +217,10 @@ func (u *Unstructured) GetNamespace() string {
 }
 
 func (u *Unstructured) SetNamespace(namespace string) {
+	if len(namespace) == 0 {
+		RemoveNestedField(u.Object, "metadata", "namespace")
+		return
+	}
 	u.setNestedField(namespace, "metadata", "namespace")
 }
 
@@ -220,6 +229,10 @@ func (u *Unstructured) GetName() string {
 }
 
 func (u *Unstructured) SetName(name string) {
+	if len(name) == 0 {
+		RemoveNestedField(u.Object, "metadata", "name")
+		return
+	}
 	u.setNestedField(name, "metadata", "name")
 }
 
@@ -227,8 +240,12 @@ func (u *Unstructured) GetGenerateName() string {
 	return getNestedString(u.Object, "metadata", "generateName")
 }
 
-func (u *Unstructured) SetGenerateName(name string) {
-	u.setNestedField(name, "metadata", "generateName")
+func (u *Unstructured) SetGenerateName(generateName string) {
+	if len(generateName) == 0 {
+		RemoveNestedField(u.Object, "metadata", "generateName")
+		return
+	}
+	u.setNestedField(generateName, "metadata", "generateName")
 }
 
 func (u *Unstructured) GetUID() types.UID {
@@ -236,6 +253,10 @@ func (u *Unstructured) GetUID() types.UID {
 }
 
 func (u *Unstructured) SetUID(uid types.UID) {
+	if len(string(uid)) == 0 {
+		RemoveNestedField(u.Object, "metadata", "uid")
+		return
+	}
 	u.setNestedField(string(uid), "metadata", "uid")
 }
 
@@ -243,8 +264,12 @@ func (u *Unstructured) GetResourceVersion() string {
 	return getNestedString(u.Object, "metadata", "resourceVersion")
 }
 
-func (u *Unstructured) SetResourceVersion(version string) {
-	u.setNestedField(version, "metadata", "resourceVersion")
+func (u *Unstructured) SetResourceVersion(resourceVersion string) {
+	if len(resourceVersion) == 0 {
+		RemoveNestedField(u.Object, "metadata", "resourceVersion")
+		return
+	}
+	u.setNestedField(resourceVersion, "metadata", "resourceVersion")
 }
 
 func (u *Unstructured) GetGeneration() int64 {
@@ -256,6 +281,10 @@ func (u *Unstructured) GetGeneration() int64 {
 }
 
 func (u *Unstructured) SetGeneration(generation int64) {
+	if generation == 0 {
+		RemoveNestedField(u.Object, "metadata", "generation")
+		return
+	}
 	u.setNestedField(generation, "metadata", "generation")
 }
 
@@ -264,6 +293,10 @@ func (u *Unstructured) GetSelfLink() string {
 }
 
 func (u *Unstructured) SetSelfLink(selfLink string) {
+	if len(selfLink) == 0 {
+		RemoveNestedField(u.Object, "metadata", "selfLink")
+		return
+	}
 	u.setNestedField(selfLink, "metadata", "selfLink")
 }
 
@@ -272,6 +305,10 @@ func (u *Unstructured) GetContinue() string {
 }
 
 func (u *Unstructured) SetContinue(c string) {
+	if len(c) == 0 {
+		RemoveNestedField(u.Object, "metadata", "continue")
+		return
+	}
 	u.setNestedField(c, "metadata", "continue")
 }
 
@@ -330,6 +367,10 @@ func (u *Unstructured) GetLabels() map[string]string {
 }
 
 func (u *Unstructured) SetLabels(labels map[string]string) {
+	if labels == nil {
+		RemoveNestedField(u.Object, "metadata", "labels")
+		return
+	}
 	u.setNestedMap(labels, "metadata", "labels")
 }
 
@@ -339,6 +380,10 @@ func (u *Unstructured) GetAnnotations() map[string]string {
 }
 
 func (u *Unstructured) SetAnnotations(annotations map[string]string) {
+	if annotations == nil {
+		RemoveNestedField(u.Object, "metadata", "annotations")
+		return
+	}
 	u.setNestedMap(annotations, "metadata", "annotations")
 }
 
@@ -387,6 +432,10 @@ func (u *Unstructured) GetFinalizers() []string {
 }
 
 func (u *Unstructured) SetFinalizers(finalizers []string) {
+	if finalizers == nil {
+		RemoveNestedField(u.Object, "metadata", "finalizers")
+		return
+	}
 	u.setNestedSlice(finalizers, "metadata", "finalizers")
 }
 
@@ -395,5 +444,9 @@ func (u *Unstructured) GetClusterName() string {
 }
 
 func (u *Unstructured) SetClusterName(clusterName string) {
+	if len(clusterName) == 0 {
+		RemoveNestedField(u.Object, "metadata", "clusterName")
+		return
+	}
 	u.setNestedField(clusterName, "metadata", "clusterName")
 }