ruby-on-rails - Rails collection_select 和 Foreign_key

Question

以下是我的代码，

<%= f.collection_select :event_member_id, EventMember.all, :id, :company_member_id, :prompt => "Please select" %>

这:company_member_id是EventMember课堂上的foreign_key，我想将text_method显示为company_member_email而不是company_member_id，

所以我的 collection_select 应该如下所示，

<%= f.collection_select :event_member_id, EventMember.all, :id, :'company_member.email', :prompt => "Please select" %>

如何实现以上...！！！

Answer 1

在EventMember模态中： -

def company_member_email
  return self.company_member.email unless self.company_member.nil?
  ""
end

集合为：-

<%= f.collection_select :event_member_id, EventMember.all, :id, :company_member_email, :prompt => "Please select" %>