change diff_result.diff to diff_result[0].diff

app/api/mobile/apis/blockchains.rb

@@ -89,10 +89,9 @@ module Mobile
           if owner
             project = Project.find_by_user_id_name(owner.id, params[:reponame])
             if project
-              Rails.logger.info "project found"
               g = Gitlab.client # 用于通过gitlab api进行查询
               diff_result = g.commit_diff(project.id, params[:oldHash])
-              Rails.logger.info diff_result.diff
+              Rails.logger.info diff_result[0].diff
             else
               Rails.logger.info "project not found"
             end