Question

class Picture < ActiveRecord::Base
    belongs_to :imageable, polymorphic: true

    mount_uploader :file, PictureUploader
end

class PictureUploader < CarrierWave::Uploader::Base
  include CarrierWave::RMagick
  storage :file
  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end
end

class Ticket < ActiveRecord::Base
    has_many :pictures, as: :imageable
    accepts_nested_attributes_for :pictures
end

查看：

h1 Add a new Ticket

= form_for @ticket do |f|
    = render partial: "fields", locals: {f: f}

    = f.fields_for :picture do |p|
        div
           = p.label :file
           = p.file_field :file, :multiple => true

    div
        = f.submit "Create a Ticket"

控制器：

class TicketsController < ApplicationController
  def create
    @ticket = Ticket.new(ticket_params)

    t = Logger.new(STDOUT)
    t.debug "================================"
    t.debug ticket_params
    t.debug "================================"

    @ticket.init_sp(ticket_show_path(Ticket.generate_id), request)

    @ticket.errors.add(:base, "Are You Spammer?") if @ticket.spam?

    if @ticket.errors.empty? and @ticket.save
      redirect_to ticket_show_path(@ticket.token), notice: "Ticket created successfully. Message sent."
    else
      render "new"
    end
  end

 private
  def load_ticket
    @ticket = Ticket.find_by_token(params[:token])    
  end

  def ticket_params
    params.require(:ticket).permit(:customer_name, :customer_email, :subject, :body, :department_id, picture_attributes: [:file])
  end
end

日志：

Started POST "/tickets" for 127.0.0.1 at 2014-06-14 16:22:28 +0300
Processing by TicketsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"3ToWruQi0Pgyo1wvRz9yOib5k13yV
Vs05dXAaWA4NuM=", "ticket"=>{"customer_name"=>"Alex Drobazko", "customer_email"=
>"drobazko@gmail.com", "subject"=>"Sample Subject", "department_id"=>"", "body"=
>"Sample Body", "picture"=>{"file"=>[#<ActionDispatch::Http::UploadedFile:0x34f6
5f0 @tempfile=#<File:C:/Users/drobazko/AppData/Local/Temp/RackMultipart20140614-
8144-hj7xsk>, @original_filename="28122007(001).jpg", @content_type="image/jpeg"
, @headers="Content-Disposition: form-data; name=\"ticket[picture][file][]\"; fi
lename=\"28122007(001).jpg\"\r\nContent-Type: image/jpeg\r\n">, #<ActionDispatch
::Http::UploadedFile:0x34f65d8 @tempfile=#<File:C:/Users/drobazko/AppData/Local/
Temp/RackMultipart20140614-8144-q2595k>, @original_filename="f3.jpg", @content_t
ype="image/jpeg", @headers="Content-Disposition: form-data; name=\"ticket[pictur
e][file][]\"; filename=\"f3.jpg\"\r\nContent-Type: image/jpeg\r\n">]}}, "commit"
=>"Create a Ticket"}
Unpermitted parameters: picture
D, [2014-06-14T16:22:28.099362 #8144] DEBUG -- : ===============================
=
Unpermitted parameters: picture
D, [2014-06-14T16:22:28.103362 #8144] DEBUG -- : {"customer_name"=>"Alex Drobazk
o", "customer_email"=>"drobazko@gmail.com", "subject"=>"Sample Subject", "body"=
>"Sample Body", "department_id"=>""}
D, [2014-06-14T16:22:28.107362 #8144] DEBUG -- : ===============================
=

问题是在Picture表中没有写入，但它在Ticket表中写入（请参阅日志）。有什么建议吗？

编辑：当我尝试将视图 = f.fields_for：图片执行| p | 更改为 = f.fields_for：图片执行| p | 但是它给了我错了未初始化的常量Ticket :: Picture

另外，我试图改变：
params.require（：ticket）.permit（：customer_name，：customer_email，：subject，：body，：department_id，picture_attributes：[：file]）
到
params.require（：ticket）.permit（：customer_name，：customer_email，：subject，：body，：department_id，pictures_attributes：[：file]）（单数复数形式）但没有效果。

有趣的问题：
一旦我重新启动服务器并将其放入视图中：

= f.fields_for：图片做| p |

文件按钮在表格上消失了））

Answer 1

您有 has_many pictures 。因此 ticket_params 应该是这样的

def ticket_params

params.require(:ticket).permit(:customer_name, :customer_email, :subject, :body, :department_id, pictures_attributes: [:file])

end

请注意 pictures 中的复数 pictures_attributes 。

<强>更新

还有这一行

= f.fields_for :picture do |p|

应该是这样的

 = f.fields_for :pictures do |p|

rails 4允许多态关联文件上传

1 个答案: