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tpl/collections: Fix union when the first slice is empty

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Fixes #3686
This commit is contained in:
Bjørn Erik Pedersen 2017-07-08 10:31:09 +02:00
parent 7bcc1ce659
commit dbbc5c4810
2 changed files with 16 additions and 0 deletions
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9
tpl/collections/collections.go
View file

@ -494,6 +494,7 @@ type intersector struct {
}
func (i *intersector) appendIfNotSeen(v reflect.Value) {
vi := v.Interface()
if !i.seen[vi] {
i.r = reflect.Append(i.r, v)
@ -565,6 +566,14 @@ func (ns *Namespace) Union(l1, l2 interface{}) (interface{}, error) {
}
}
if !l1vv.IsValid() {
// The first slice may be empty. Pick the first value of the second
// to use as a prototype.
if l2v.Len() > 0 {
l1vv = l2v.Index(0)
}
}
for j := 0; j < l2v.Len(); j++ {
l2vv := l2v.Index(j)

7
tpl/collections/collections_test.go
View file

@ -666,6 +666,13 @@ func TestUnion(t *testing.T) {
{pagesVals{p1v}, pagesVals{p3v, p3v}, pagesVals{p1v, p3v}, false},
{[]interface{}{p1, p4}, []interface{}{p4, p2, p2}, []interface{}{p1, p4, p2}, false},
{[]interface{}{p1v}, []interface{}{p3v, p3v}, []interface{}{p1v, p3v}, false},
// #3686
{[]interface{}{p1v}, []interface{}{}, []interface{}{p1v}, false},
{[]interface{}{}, []interface{}{p1v}, []interface{}{p1v}, false},
{pagesPtr{p1}, pagesPtr{}, pagesPtr{p1}, false},
{pagesVals{p1v}, pagesVals{}, pagesVals{p1v}, false},
{pagesPtr{}, pagesPtr{p1}, pagesPtr{p1}, false},
{pagesVals{}, pagesVals{p1v}, pagesVals{p1v}, false},
// errors
{"not array or slice", []string{"a"}, false, true},