实训搜索优化

app/controllers/shixuns_controller.rb

@@ -44,7 +44,7 @@ class ShixunsController < ApplicationController
 		## 搜索关键字 匹配关卡名, 用户名, 实训名 和 空格多搜索
 		if params[:keyword].present?
 			keyword = params[:keyword].strip
-			@shixuns = @shixuns.joins(:users, challenges: :challenge_tags).
+			@shixuns = @shixuns.joins(:user, challenges: :challenge_tags).
 					where("challenge_tags.name like '%#{keyword}%'
                   or challenges.subject like '%#{keyword}%'
                   or concat(lastname, firstname) like '%#{keyword}%'