迁移KE

db/migrate/20190805010553_modify_ke_contents_for_markdown.rb

@@ -5,7 +5,7 @@ class ModifyKeContentsForMarkdown < ActiveRecord::Migration[5.2]
       return content if content.blank?
       s_contents = sanitize(content, tags: %w(img a span table td tr tbody pre), attributes: %w(src href target style))
       s_contents.gsub(">\n<", "><").gsub(/^\n/, "").gsub(" ", "").gsub(/(\n)+/, "<br />")
-          .gsub("\t", "").gsub("\n", "").gsub(" ", "&nbsp;").gsub(/(<br\s?\/?>)+/, "<br />")
+          .gsub("\t", "").gsub("\n", "").gsub("    ", "&nbsp;&nbsp;&nbsp;&nbsp;").gsub(/(<br\s?\/?>)+/, "<br />")
     end
     #
     # # 课程讨论区