课程/项目--添加成员：用真实姓名搜索用户时，需要在姓和名之间加个空格才可以搜到

app/models/principal.rb

@@ -42,7 +42,8 @@ class Principal < ActiveRecord::Base
       where({})
     else
       pattern = "%#{q}%"
-      sql = %w(login firstname lastname mail).map {|column| "LOWER(#{table_name}.#{column}) LIKE LOWER(:p)"}.join(" OR ")
+      # sql = %w(login firstname lastname mail).map {|column| "LOWER(#{table_name}.#{column}) LIKE LOWER(:p)"}.join(" OR ")
+      sql= "LOWER(concat(lastname,firstname)) LIKE LOWER(:p) or LOWER(login) LIKE LOWER(:p) or LOWER(mail) LIKE LOWER(:p)"
       params = {:p => pattern}
       if q =~ /^(.+)\s+(.+)$/
         a, b = "#{$1}%", "#{$2}%"