如何在 Rails 中向此 :select 添加 WHERE 语句？

Question

我有当前的 find 语句：select:

@list = Contact.find :all,
  :select => "companies.name AS co_name,  
              COUNT(contact_emails.id) AS email_count, 
              COUNT(contact_calls.id) AS call_count, 
              COUNT(contact_letters.id) AS letter_count, 
              COUNT(contact_postalcards.id) AS postalcard_count,",
  :joins => [
    "LEFT JOIN companies ON companies.id = contacts.company_id",
    "LEFT JOIN contact_emails ON contact_emails.contact_id = contacts.id",
    "LEFT JOIN contact_letters ON contact_letters.contact_id = contacts.id",
    "LEFT JOIN contact_postalcards ON contact_postalcards.contact_id = contacts.id",
    "LEFT JOIN contact_calls ON contact_calls.contact_id = contacts.id"
  ],
  #:group => "companies.id"
   :group => "companies.name"

我只想提取那些 contact_email、contact_letters 等具有 date_sent < 的实例。 report_end_date 和 date_sent >报告开始日期。

我该怎么做？

Answer 1

通过添加条件。例如：

:conditions => ['contact_emails.date_sent < ? and contact_emails.date_sent > ?', report_end_date, report_start_date]