Merge branch 'dev_aliyun' of https://bdgit.educoder.net/Hjqreturn/educoder into dev_aliyun

app/controllers/shixuns_controller.rb

@@ -409,12 +409,12 @@ class ShixunsController < ApplicationController
 	end
 
 	def propaedeutics
-		@content = Shixun.where(identifier: params[:identifier]).pluck(:propaedeutics)
+		@content = Shixun.find_by_identifier!(params[:identifier]).propaedeutics
 	end
 
 	# 更新背景知识
 	def update_propaedeutics
-		@shixun.update_column(:propaedeutics, params[:content])
+		@shixun.shixun_info.update_column(:propaedeutics, params[:content])
 	end
 
 	# 获取推荐实训接口 2个热门实训 + 2个最新实训