shixun默认值

app/views/shixuns/_settings_show.html.erb

@@ -1,3 +1,4 @@
+
 <div class="edu-back-white mb10">
   <div class="pt30 pl20 pr20 pb40 bor-bottom-greyE clearfix">
     <span class="fl font-16">配置</span>

db/migrate/20190525060616_modify_exec_time_for_shixun.rb

@@ -0,0 +1,8 @@
+class ModifyExecTimeForShixun < ActiveRecord::Migration
+  def up
+    change_column(:shixuns, :exec_time, :integer, :default => 20)
+  end
+
+  def down
+  end
+end