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我正在尝试基于 Ryan Bates 的 #196 Railscasts Nested Forms 1 的嵌套表单。我正在使用Nested_form和Simple_formgems。也许代码正在与宝石竞争？

似乎不会消失的错误是

ActiveRecord::UnknownAttributeError at   /surveys/new
unknown attribute: customer_id

当我在Survey页面上并提交"New Survey".

我有一个Customer模型和一个Contact模型，它们与Survey.

它指的是 Survey Controller 中的最后一行：

def new
   12     @survey = Survey.new
   13     3.times do
   14       customer = @survey.customers.build
   15       2.times { customer.contacts.build }

我尝试过的解决方案包括将迁移添加CustomerId到Survey表或Customer表中。我目前已删除所有对customer_id.

这里是survey.rb

class Survey < ActiveRecord::Base
  has_many :contacts
  has_many :customers, :dependent => :destroy
  accepts_nested_attributes_for :customers, :reject_if => lambda { |a| a[:content].blank? } :allow_destroy => true
  attr_accessible :name, :customers_attributes
end

这里是customer.rb

class Customer < ActiveRecord::Base
  belongs_to :survey
  has_many :contacts
  attr_accessible :company, :first_name, :last_name, :contacts_attributes, :customer_id
  accepts_nested_attributes_for :contacts, :reject_if => lambda { |a| a[:content].blank? } :allow_destroy => true
end

这是contact.rb

class Contact < ActiveRecord::Base
  attr_accessible :mobile_phone, :email
  belongs_to :customer
end

这是我的form.html.haml

= simple_nested_form_for @survey do |f|
  = f.error_notification
  = f.input :name
  = f.fields_for :customers do |builder|
    = render "customer_fields", :f => builder
    %p= f.submit "Submit"

对新手有帮助吗？谢谢！！

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