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" %>

此处:company_member_id是EventMember类中的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" %>

如何实现上述...... !!!

Answer 1

在EventMember模态中： -

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

收藏品如下： -

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