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tpl/collections: Allow pointer receiver in Group

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See #4865
This commit is contained in:
Bjørn Erik Pedersen 2018-09-08 21:56:36 +02:00
parent 6667c6d743
commit 7a97d3e6bc
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GPG key ID: 330E6E2BD4859D8F
2 changed files with 11 additions and 1 deletions
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2
tpl/collections/collections.go
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@ -326,7 +326,7 @@ func (ns *Namespace) Group(key interface{}, items interface{}) (interface{}, err
if tp.Kind() == reflect.Ptr {
tp = tp.Elem()
}
in := reflect.Zero(tp).Interface()
in := reflect.New(tp).Interface()
switch vv := in.(type) {
case collections.Grouper:
return vv.Group(key, items)

10
tpl/collections/collections_test.go
View file

@ -85,6 +85,14 @@ func (g tstGrouper) Group(key interface{}, items interface{}) (interface{}, erro
return fmt.Sprintf("%v(%d)", key, ilen), nil
}
type tstGrouper2 struct {
}
func (g *tstGrouper2) Group(key interface{}, items interface{}) (interface{}, error) {
ilen := reflect.ValueOf(items).Len()
return fmt.Sprintf("%v(%d)", key, ilen), nil
}
func TestGroup(t *testing.T) {
t.Parallel()
@ -98,6 +106,8 @@ func TestGroup(t *testing.T) {
{"a", []*tstGrouper{&tstGrouper{}, &tstGrouper{}}, "a(2)"},
{"b", tstGroupers{&tstGrouper{}, &tstGrouper{}}, "b(2)"},
{"a", []tstGrouper{tstGrouper{}, tstGrouper{}}, "a(2)"},
{"a", []*tstGrouper2{&tstGrouper2{}, &tstGrouper2{}}, "a(2)"},
{"b", []tstGrouper2{tstGrouper2{}, tstGrouper2{}}, "b(2)"},
{"a", []*tstGrouper{}, "a(0)"},
{"a", []string{"a", "b"}, false},
{nil, []*tstGrouper{&tstGrouper{}, &tstGrouper{}}, false},