Call Validate on custom slice types. Fixes elastic#133.

reify.go

@@ -577,6 +577,11 @@ func reifyDoArray(
 		return reflect.Value{}, raiseValidation(ctx, val.meta(), "", err)
 	}
 
+	if err := tryValidate(to); err != nil {
+		ctx := val.Context()
+		return reflect.Value{}, raiseValidation(ctx, val.meta(), "", err)
+	}
+
 	return to, nil
 }
 

validator_test.go

@@ -27,6 +27,7 @@ import (
 )
 
 type myNonzeroInt int
+type myCustomList []int
 
 type structValidator struct{ I int }
 type ptrStructValidator struct{ I int }
@@ -37,6 +38,13 @@ func (m myNonzeroInt) Validate() error {
 	return testZeroErr(int(m))
 }
 
+func (l myCustomList) Validate() error {
+	if len(l) == 0 {
+		return errZeroTest
+	}
+	return nil
+}
+
 func (s structValidator) Validate() error {
 	return testZeroErr(s.I)
 }
@@ -59,6 +67,7 @@ func TestValidationPass(t *testing.T) {
 		"i": 5,
 		"d": -10,
 		"f": 3.14,
+		"l": []int{0, 1},
 	})
 
 	tests := []interface{}{
@@ -163,6 +172,11 @@ func TestValidationPass(t *testing.T) {
 			X time.Duration `config:"f" validate:"min=3, max=20"`
 		}{},
 
+		// validate field 'l'
+		&struct {
+			L myCustomList
+		}{},
+
 		// other
 		&struct {
 			X int // field not present in config, but not required
@@ -184,6 +198,7 @@ func TestValidationFail(t *testing.T) {
 		"i": 0,
 		"d": -10,
 		"f": 3.14,
+		"l": []int{},
 	})
 
 	tests := []interface{}{
@@ -261,6 +276,11 @@ func TestValidationFail(t *testing.T) {
 			X time.Duration `config:"f" validate:"min=20s"`
 		}{},
 
+		// test field 'l'
+		&struct {
+			X myCustomList `config:"l"`
+		}{},
+
 		// other
 		&struct {
 			X int `validate:"required"`