Allow multiple patch strategies.

kyaml/yaml/schema/schema.go

@@ -5,22 +5,21 @@
 package schema
 
 import (
+	"strings"
+
 	"sigs.k8s.io/kustomize/kyaml/openapi"
 	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
-// IsAssociative returns true if all elements in the list contain an AssociativeSequenceKey
-// as a field.
+// IsAssociative returns true if all elements in the list contain an
+// AssociativeSequenceKey as a field.
 func IsAssociative(schema *openapi.ResourceSchema, nodes []*yaml.RNode, infer bool) bool {
 	if schema != nil {
-		// use the schema to identify if the list is associative
-		s, _ := schema.PatchStrategyAndKey()
-		return s == "merge"
+		return schemaHasMergeStrategy(schema)
 	}
 	if !infer {
 		return false
 	}
-
 	for i := range nodes {
 		node := nodes[i]
 		if yaml.IsEmpty(node) {
@@ -32,3 +31,14 @@ func IsAssociative(schema *openapi.ResourceSchema, nodes []*yaml.RNode, infer bo
 	}
 	return false
 }
+
+func schemaHasMergeStrategy(schema *openapi.ResourceSchema) bool {
+	tmp, _ := schema.PatchStrategyAndKey()
+	strategies := strings.Split(tmp, ",")
+	for _, s := range strategies {
+		if s == "merge" {
+			return true
+		}
+	}
+	return false
+}