From 55d0b89417651eba3ae51c96bd9de9e0daa0399e Mon Sep 17 00:00:00 2001
From: Cameron Moore <moorereason@gmail.com>
Date: Thu, 27 Jul 2017 17:23:49 -0500
Subject: [PATCH] tpl/collections: Fix intersect on []interface{} handling

Fixes #3718
---
 tpl/collections/where.go      | 6 +++++-
 tpl/collections/where_test.go | 6 ++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

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 {