Added missing validation for adding sequences to maps #1341

pkg/yqlib/operator_add.go

@@ -62,6 +62,9 @@ func add(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *Candida
 
 	switch lhsNode.Kind {
 	case yaml.MappingNode:
+		if rhs.Node.Kind != yaml.MappingNode {
+			return nil, fmt.Errorf("%v (%v) cannot be added to a %v (%v)", rhs.Node.Tag, rhs.GetNicePath(), lhsNode.Tag, lhs.GetNicePath())
+		}
 		addMaps(target, lhs, rhs)
 	case yaml.SequenceNode:
 		if err := addSequences(target, lhs, rhs); err != nil {
@@ -70,7 +73,7 @@ func add(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *Candida
 
 	case yaml.ScalarNode:
 		if rhs.Node.Kind != yaml.ScalarNode {
-			return nil, fmt.Errorf("%v (%v) cannot be added to a %v", rhs.Node.Tag, rhs.Path, lhsNode.Tag)
+			return nil, fmt.Errorf("%v (%v) cannot be added to a %v (%v)", rhs.Node.Tag, rhs.GetNicePath(), lhsNode.Tag, lhs.GetNicePath())
 		}
 		target.Node.Kind = yaml.ScalarNode
 		target.Node.Style = lhsNode.Style

pkg/yqlib/operator_add_test.go

@@ -350,6 +350,20 @@ var addOperatorScenarios = []expressionScenario{
 			"D0, P[], (doc)::a: &horse [1, 2]\n",
 		},
 	},
+	{
+		skipDoc:       true,
+		description:   "Add sequence to map",
+		document:      "a: {x: cool}",
+		expression:    `.a += [2]`,
+		expectedError: "!!seq () cannot be added to a !!map (a)",
+	},
+	{
+		skipDoc:       true,
+		description:   "Add sequence to scalar",
+		document:      "a: cool",
+		expression:    `.a += [2]`,
+		expectedError: "!!seq () cannot be added to a !!str (a)",
+	},
 }
 
 func TestAddOperatorScenarios(t *testing.T) {

pkg/yqlib/operators_test.go

@@ -100,7 +100,11 @@ func testScenario(t *testing.T, s *expressionScenario) {
 	context, err := NewDataTreeNavigator().GetMatchingNodes(Context{MatchingNodes: inputs}, node)
 
 	if s.expectedError != "" {
+		if err == nil {
+			t.Errorf("Expected error '%v' but it worked!", s.expectedError)
+		} else {
 			test.AssertResultComplexWithContext(t, s.expectedError, err.Error(), fmt.Sprintf("desc: %v\nexp: %v\ndoc: %v", s.description, s.expression, s.document))
+		}
 		return
 	}