本文解析了一段复杂的Rails查询代码，将其转换为SQL语句以便更好地理解其工作原理。通过内连接role_relations表，并基于特定条件筛选，实现了对用户数据的有效获取。
User.find(
:all,
:select => "name.*",
:from => "users",
:joins => " [color=red]inner join role_relations rr on rr.user_group_id = ugn.user_group_id[/color] ",
:conditions => "rr.user_id = #{user_id} and ugn.news_id = #{news_id}")
解释成sql语句 select name.* from users [color=red]inner join role_relations rr on rr.user_group_id = ugn.user_group_id[/color] where rr.user_id = #{user_id} and ugn.news_id = #{news_id}"
:all,
:select => "name.*",
:from => "users",
:joins => " [color=red]inner join role_relations rr on rr.user_group_id = ugn.user_group_id[/color] ",
:conditions => "rr.user_id = #{user_id} and ugn.news_id = #{news_id}")
解释成sql语句 select name.* from users [color=red]inner join role_relations rr on rr.user_group_id = ugn.user_group_id[/color] where rr.user_id = #{user_id} and ugn.news_id = #{news_id}"
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