laboratory: index api modify

app/controllers/concerns/laboratory_helper.rb

@@ -10,6 +10,10 @@ module LaboratoryHelper
     @_current_laboratory ||= (Laboratory.find_by_subdomain(request.subdomain) || Laboratory.find(1))
   end
 
+  def default_laboratory
+    @_default_laboratory ||= Laboratory.find(1)
+  end
+
   def default_setting
     @_default_setting ||= LaboratorySetting.find_by(laboratory_id: 1)
   end

app/controllers/home_controller.rb

@@ -3,6 +3,8 @@ class HomeController < ApplicationController
   def index
     # banner图
     images = current_laboratory.portal_images.only_online.order(position: :asc)
+    images = default_laboratory.portal_images.only_online.order(position: :asc) if images.blank? # 未设置时使用EduCoder的轮播图
+
     @images_url = []
     images.each do |image|
       @images_url << {path: image.link, image_url: Util::FileManage.source_disk_file_url(image)}