verify question has recommend tag

i18n/en_US.yaml

@@ -74,6 +74,8 @@ backend:
     tag:
       not_found:
         other: "Tag not found."
+      recommend_tag_not_found:
+        other: "Recommend Tag is not exist."
     theme:
       not_found:
         other: "Theme not found."

internal/base/reason/reason.go

@@ -43,4 +43,5 @@ const (
 	InstallCreateTableFailed     = "error.database.create_table_failed"
 	InstallConfigFailed          = "error.install.create_config_failed"
 	SiteInfoNotFound             = "error.site_info.not_found"
+	RecommendTagNotExist         = "error.tag.recommend_tag_not_found"
 )

internal/service/question_service.go

@@ -105,6 +105,16 @@ func (qs *QuestionService) CloseMsgList(ctx context.Context, lang i18n.Language)
 
 // AddQuestion add question
 func (qs *QuestionService) AddQuestion(ctx context.Context, req *schema.QuestionAdd) (questionInfo *schema.QuestionInfo, err error) {
+	recommendExist, err := qs.tagCommon.ExistRecommend(ctx, req.Tags)
+	if err != nil {
+		return
+	}
+	if !recommendExist {
+		err = fmt.Errorf("recommend is not exist")
+		err = errors.BadRequest(reason.RecommendTagNotExist).WithError(err).WithStack()
+		return
+	}
+
 	questionInfo = &schema.QuestionInfo{}
 	question := &entity.Question{}
 	now := time.Now()

internal/service/tag_common/tag_common.go

@@ -81,6 +81,23 @@ func (ts *TagCommonService) GetTagListByNames(ctx context.Context, tagNames []st
 	return ts.tagRepo.GetTagListByNames(ctx, tagNames)
 }
 
+func (ts *TagCommonService) ExistRecommend(ctx context.Context, tags []*schema.TagItem) (bool, error) {
+	tagNames := make([]string, 0)
+	for _, item := range tags {
+		tagNames = append(tagNames, item.SlugName)
+	}
+	list, err := ts.GetTagListByNames(ctx, tagNames)
+	if err != nil {
+		return false, err
+	}
+	for _, item := range list {
+		if item.Recommend {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
 //
 
 // GetObjectTag get object tag