diff --git a/controller/adapter.go b/controller/adapter.go
index 051a5a71..b385a31a 100644
--- a/controller/adapter.go
+++ b/controller/adapter.go
@@ -3,6 +3,7 @@ package controller
 import (
 	"strconv"
 
+	"github.com/google/uuid"
 	"github.com/labstack/echo/v4"
 	"github.com/traPtitech/anke-to/model"
 	"github.com/traPtitech/anke-to/openapi"
@@ -64,10 +65,10 @@ func convertResSharedTo(resSharedTo string) openapi.ResShareType {
 
 }
 
-func createUsersAndGroups(users []string, groups []string) openapi.UsersAndGroups {
+func createUsersAndGroups(users []string, groups uuid.UUIDs) openapi.UsersAndGroups {
 	res := openapi.UsersAndGroups{
 		Users:  users,
-		Groups: groups,
+		Groups: groups.Strings(),
 	}
 	return res
 }
@@ -147,14 +148,14 @@ func convertRespondents(respondents []model.Respondents) []string {
 	return res
 }
 
-func questionnaire2QuestionnaireDetail(questionnaires model.Questionnaires, adminUsers []string, adminGroups []string, targetUsers []string, targetGroups []string, respondents []string) openapi.QuestionnaireDetail {
+func questionnaire2QuestionnaireDetail(questionnaires model.Questionnaires, adminUsers []string, adminGroups []uuid.UUID, targetUsers []string, targetGroups []uuid.UUID, respondents []string) openapi.QuestionnaireDetail {
 	res := openapi.QuestionnaireDetail{
 		Admins:      createUsersAndGroups(adminUsers, adminGroups),
 		CreatedAt:   questionnaires.CreatedAt,
 		Description: questionnaires.Description,
 		// IsAllowingMultipleResponses: questionnaires.IsAllowingMultipleResponses,
-		IsAnonymous:                 questionnaires.IsAnonymous,
-		IsPublished:                 questionnaires.IsPublished,
+		IsAnonymous:         questionnaires.IsAnonymous,
+		IsPublished:         questionnaires.IsPublished,
 		ModifiedAt:          questionnaires.ModifiedAt,
 		QuestionnaireId:     questionnaires.ID,
 		Questions:           convertQuestions(questionnaires.Questions),
diff --git a/model/questionnaires.go b/model/questionnaires.go
index e6ac50c8..0ed2780b 100644
--- a/model/questionnaires.go
+++ b/model/questionnaires.go
@@ -5,6 +5,7 @@ package model
 import (
 	"context"
 
+	"github.com/google/uuid"
 	"gopkg.in/guregu/null.v4"
 )
 
@@ -15,7 +16,7 @@ type IQuestionnaire interface {
 	DeleteQuestionnaire(ctx context.Context, questionnaireID int) error
 	GetQuestionnaires(ctx context.Context, userID string, sort string, search string, pageNum int, onlyTargetingMe bool, onlyAdministratedByMe bool) ([]QuestionnaireInfo, int, error)
 	GetAdminQuestionnaires(ctx context.Context, userID string) ([]Questionnaires, error)
-	GetQuestionnaireInfo(ctx context.Context, questionnaireID int) (*Questionnaires, []string, []string, []string, []string, []string, error)
+	GetQuestionnaireInfo(ctx context.Context, questionnaireID int) (*Questionnaires, []string, []uuid.UUID, []string, []uuid.UUID, []string, error)
 	GetTargettedQuestionnaires(ctx context.Context, userID string, answered string, sort string) ([]TargettedQuestionnaire, error)
 	GetQuestionnaireLimit(ctx context.Context, questionnaireID int) (null.Time, error)
 	GetQuestionnaireLimitByResponseID(ctx context.Context, responseID int) (null.Time, error)