When adding users to group drop duplicate users (#50)

pkg/service/group.go

@@ -223,7 +223,7 @@ func (s *groupService) createGroupAccountRelations(ctx context.Context, groupId
 	// TODO: add transactions
 	var grpaccs []models.GroupAccount
 	var ugs []*authzv1.UserGroup
-	for _, account := range group.GetSpec().GetUsers() {
+	for _, account := range unique(group.GetSpec().GetUsers()) {
 		// FIXME: do combined lookup
 		entity, err := s.dao.GetIdByTraits(ctx, account, &models.KratosIdentities{})
 		if err != nil {

pkg/service/utils.go

@@ -0,0 +1,13 @@
+package service
+
+func unique(items []string) []string {
+	keys := make(map[string]bool)
+	list := []string{}
+	for _, entry := range items {
+		if _, value := keys[entry]; !value {
+			keys[entry] = true
+			list = append(list, entry)
+		}
+	}
+	return list
+}