无方法错误,带集合\选择

我正在为一个 :has_many :through 关系:

class Account < ActiveRecord::Base
  has_many :employments
  has_many :people, :through => :employments
  accepts_nested_attributes_for :employments
end

class Person < ActiveRecord::Base
  has_many :employments
  has_many :accounts, :through => :employments
end

class Employment < ActiveRecord::Base
  belongs_to :account
  belongs_to :person
end

这个 Employment 模型包含字段 :account_id 和 :person_id .

在帐户表单中,我添加了:

<% fields_for 'account[employments_attributes][]', @account.employments do |e| %>
  <%= e.hidden_field :account_id, :value => @account.id %>
  <%= e.collection_select :person_id, Person.all, :id, :name %>
<% end %>

collection_select 或 select 此外,在任何排列中,我给他们一个失败的命名错误例外:

undefined method `person_id' for #<Array:0x82e7db0>

就好像 person_id 字段不存在,但我可以使用 会计人员 和 :个人ID 非常好。