tpl/collections: Fix intersect on []interface{} handling

Fixes #3718

2 files changed, 11 insertions, 1 deletions

diff --git a/tpl/collections/where.go b/tpl/collections/where.go
index 37be00509..be5c8205b 100644
--- a/tpl/collections/where.go
+++ b/tpl/collections/where.go
@@ -53,6 +53,7 @@ func (ns *Namespace) checkCondition(v, mv reflect.Value, op string) (bool, error
 	if !v.IsValid() {
 		vIsNil = true
 	}
+
 	mv, mvIsNil := indirect(mv)
 	if !mv.IsValid() {
 		mvIsNil = true
@@ -115,7 +116,7 @@ func (ns *Namespace) checkCondition(v, mv reflect.Value, op string) (bool, error
 			return false, nil
 		}
 
-		if v.Kind() != reflect.Interface && mv.Type().Elem().Kind() != reflect.Interface && mv.Type().Elem() != v.Type() {
+		if v.Kind() != reflect.Interface && mv.Type().Elem().Kind() != reflect.Interface && mv.Type().Elem() != v.Type() && v.Kind() != reflect.Array && v.Kind() != reflect.Slice {
 			return false, nil
 		}
 		switch v.Kind() {
@@ -144,6 +145,9 @@ func (ns *Namespace) checkCondition(v, mv reflect.Value, op string) (bool, error
 					ima = append(ima, toTimeUnix(mv.Index(i)))
 				}
 			}
+		case reflect.Array, reflect.Slice:
+			slv = v.Interface()
+			slmv = mv.Interface()
 		}
 	}
 
diff --git a/tpl/collections/where_test.go b/tpl/collections/where_test.go
index 771fafb61..e70283778 100644
--- a/tpl/collections/where_test.go
+++ b/tpl/collections/where_test.go
@@ -536,6 +536,12 @@ func TestCheckCondition(t *testing.T) {
 		{reflect.ValueOf(true), reflect.ValueOf(false), ">", expect{false, false}},
 		{reflect.ValueOf(123), reflect.ValueOf([]int{}), "in", expect{false, false}},
 		{reflect.ValueOf(123), reflect.ValueOf(123), "op", expect{false, true}},
+
+		// Issue #3718
+		{reflect.ValueOf([]interface{}{"a"}), reflect.ValueOf([]string{"a", "b"}), "intersect", expect{true, false}},
+		{reflect.ValueOf([]string{"a"}), reflect.ValueOf([]interface{}{"a", "b"}), "intersect", expect{true, false}},
+		{reflect.ValueOf([]interface{}{1, 2}), reflect.ValueOf([]int{1}), "intersect", expect{true, false}},
+		{reflect.ValueOf([]int{1}), reflect.ValueOf([]interface{}{1, 2}), "intersect", expect{true, false}},
 	} {
 		result, err := ns.checkCondition(test.value, test.match, test.op)
 		if test.expect.isError {