搜索用户修改为按昵称搜索

app/models/user.rb

@@ -202,7 +202,8 @@ class User < Principal
       where(nil)
     else
       pattern = "%#{arg.to_s.strip.downcase}%"
-      where(" LOWER(concat(lastname, firstname)) LIKE :p ", :p => pattern)
+      #where(" LOWER(concat(lastname, firstname)) LIKE :p ", :p => pattern)
+      where(" LOWER(login) LIKE :p ", :p => pattern)
     end
   }