undefined方法`tripphoto_changed？' 为... Carrierwave

Question

我正在尝试通过关联添加新的旅行时保存图像.

tripphoto.rb有一个 belongs_to :trip

和我的trip.rb有一个has_many :tripphotos.此外,Carrierwave文档需要更多的东西,如上传器和我已正确设置的(它没有关联工作!).

随之mount_uploader :tripphoto, TripphotoUploader而来的是我已经进入了我的trip.rb并accepts_nested_attributes_for :tripphotos, allow_destroy: true让我的表单正常工作:

    <%= fields_for :tripphotos do |photo| %>
      Img <%= photo.file_field :filename %>
    <% end %>

尽管如此,我得到错误undefined methodtripphoto_changed？' 对于#`.一个快速的谷歌没有合适的结果.有什么建议？

PS这是我的Tripphoto表:

class Tripphoto < ActiveRecord::Base {
    :id => :integer,
    :filename => :string,
    :trip_id => :integer,
    :created_at => :datetime,
    :updated_at => :datetime
}

提前致谢,

编辑:根据要求我的代码:

Trip.rb

class Trip < ActiveRecord::Base
  attr_accessible :description, :title, :user_id, 
  :triplocations_attributes, :photo, :category_ids, 
  :start_city, :tripphotos, :img_url, :thumb_url, :images,
  :tags_attributes

  # validates :title, :length => {:minimum => 3}
  # validates :description, :presence => true
  # validates_associated :tags


  has_many :triplocations, :dependent => :destroy
  has_many :tripphotos, :dependent => :destroy

  has_and_belongs_to_many :categories
  has_and_belongs_to_many :tags


  accepts_nested_attributes_for :triplocations, allow_destroy: true
  accepts_nested_attributes_for :tripphotos, allow_destroy: true
  accepts_nested_attributes_for :categories
  accepts_nested_attributes_for :tags


  mount_uploader :tripphoto, TripphotoUploader
end

Tripphoto.rb

class Tripphoto < ActiveRecord::Base
  attr_accessible :filename, :trip_id
  belongs_to :trip
end

完整的旅行表格

<%= form_for @trip, :html => {:multipart => true} do |a| %> 
    <%= a.label :title, "Routetitel" %>
    <%= a.text_field :title %>

    <%= a.label :description, "Omschrijving" %>
    <%= a.text_area :description %>

    <%= a.label :start_city, "Stad" %>
    <%= a.text_field :start_city, :id => "cityName" %>

    <% for category in Category.find(:all) %>
        <div>
          <%= check_box_tag "trip[category_ids][]", category.id, @trip.categories.include?(category) %>
          <%= category.name %>
        </div>
    <% end %>
    <%= a.fields_for :tags do |f| %>
        <p>
            <%= f.label :title, 'Steekwoorden:' %>
            <%= f.text_field :title %>
        </p> 
        <div id="inputFields"></div>

    <% end %>
    <div style="background: red;">
        <%= fields_for :tripphotos do |photo| %>
          Img <%= photo.file_field :filename %>
        <% end %>
    </div>


    <%= a.submit 'Verstuur' %>
<% end %>

Answer 1

我有同样的问题,

对我而言,我忘了跑:

bundle exec rake db:migrate

那是关于你的问题的原因吗？模型中缺少方法.