use generics

Signed-off-by: bakito <github@bakito.ch>

Author: bakito

resource/composed/composed.go

@@ -43,14 +43,10 @@ func New() *Unstructured {
 }
 
 // To converts a unstructured composed resource to the provided object.
-func To(un *Unstructured, obj interface{}) error {
-	rt, ok := obj.(runtime.Object)
-	if !ok {
-		return errors.New("object is not a compatible runtime.Object")
-	}
+func To[T runtime.Object](un *Unstructured, obj T) error {
 
 	// Get known GVKs for the runtime object type
-	knownGVKs, _, err := Scheme.ObjectKinds(rt)
+	knownGVKs, _, err := Scheme.ObjectKinds(obj)
 	if err != nil {
 		return errors.Errorf("could not retrieve GVKs for the provided object: %v", err)
 	}

resource/composed/composed_test.go

@@ -241,7 +241,7 @@ func TestTo(t *testing.T) {
 	v1beta1.AddToScheme(Scheme)
 	type args struct {
 		un  *Unstructured
-		obj interface{}
+		obj runtime.Object
 	}
 	type want struct {
 		obj interface{}
@@ -316,23 +316,6 @@ func TestTo(t *testing.T) {
 				err: errors.New("GVK /test.example.io, Kind=Unknown is not known by the scheme for the provided object type"),
 			},
 		},
-		"NoRuntimeObject": {
-			reason: "Should only convert to a object if the object is a runtime.Object",
-			args: args{
-				un: &Unstructured{Unstructured: unstructured.Unstructured{Object: map[string]any{
-					"apiVersion": v1beta1.CRDGroupVersion.String(),
-					"kind":       v1beta1.Bucket_Kind,
-					"metadata": map[string]any{
-						"name": "cool-bucket",
-					},
-				}}},
-				obj: "not-a-runtime-object",
-			},
-			want: want{
-				obj: string("not-a-runtime-object"),
-				err: errors.New("object is not a compatible runtime.Object"),
-			},
-		},
 	}
 
 	for name, tc := range cases {