谁能帮我写出合适的WHERE AND条件？或者如果它是对的,有什么区别？
1.
get_primary_status = Trustee.select(:id).where(:secret_key => seckey, :user_id => user_id, :primary_trustee => '1')
2.
get_primary_status = Trustee.select(:id).where(:secret_key => seckey).where(:user_id => user_id).where(:primary_trustee => '1')
3.
get_primary_status = Trustee.select(:id).where('secret_key = (?) AND user_id = (?) AND primary_trustee = (?)', seckey, user, '1')
帮助我用 ruby 编写 GROUP_BY 条件。我现在必须将 PHP 项目迁移到 Ruby，并面临这个问题。不要严格判断，我是 Ruby 新手。
这是php中的查询：
$get_details_email = db_query("Select secret_key,trustee_status,email_id from trustees where request_by='email' AND user_id='$user_id' group by email_id");
如何在 email_id 上对下面的查询进行分组？
get_details_email = Trustee.select(:secret_key, :trustee_status, :email_id).where(:request_by => 'email', :user_id => user_id)