这是图像模式有一个1：1的关联与组织模式。在组织控制器，创建方法在一个名为 upload_file 。

 高清创建
  @organization = Organization.new（new_params）
  如果@ organization.save
    Image.upload_file（@ organization.id）
  结束
结束
 

在 upload_file 方法使用carrierwave上传来存储标准文件在Amazon S3的桶中。为此，图像模型包括 mount_uploader：FILE_NAME，ImageUploader

我的问题是如何为上传的文件创建一个Image实例？的路径保存的文件应存放在 FILE_NAME 在图像模型中的列。而与图像相关的组织应存放在 ORGANIZATION_ID 在图像模型中的列。我怎样才能做到这一点？更具体地说，什么code，我应该为它添加到下面的模型法？ （另见注释在下面的方法

 高清self.upload_file（ORGANIZATION_ID）
  文件='应用程序/资产/ emptyfile.xml
  上传= ImageUploader.new
  uploader.store！（文件）
  ＃我是正确的假设，previous线上传使用上传的文件，但还没有建立一个影像纪录？
  ＃如果是这样的话，或许下一行应该如下？：
  ＃Image.create！（ORGANIZATION_ID：ORGANIZATION_ID，文件名：file.public_url）
  ＃我提出了file.public_url。什么是正确的code到包括上载存储图像的（在我的情况下，亚马逊S3存储）的路径？
结束
 

目前在轨控制台我收到以下错误：

 ＆GT;＆GT;上传= ImageUploader.new
=＆GT; ＃＆LT; ImageUploader：0x00000005d24f88 @模型=零，@ mounted_as =零，@ fog_directory =零＆GT;
＆GT;＆GT;文件='应用程序/资产/ emptyfile.xml
=＆GT; 应用程序/资产/ emptyfile.xml
＆GT;＆GT; uploader.store！（文件）
CarrierWave :: FormNotMultipart：CarrierWave :: FormNotMultipart
  从/usr/local/rvm/gems/ruby-2.2.1/gems/carrierwave-0.10.0/lib/carrierwave/uploader/cache.rb:120:in`缓存！
  等等
 

解决方案

您不必调用上传者自己。 Carrierwave配备了一个机制，做AR模型上传和存储您：

 类组织与LT;的ActiveRecord :: Base的
  mount_uploader：图像，​​ImageUploader
结束
 

然后，你可以做

  U = Organization.new
u.image = PARAMS [：文件]＃将这样的文件，或者

＃ 喜欢这个
File.open方法（'地方'）办| F |
  u.image = F
结束

u.save！
u.image.url＃=＆GT; /url/to/file.png

u.image.current_path＃=＆GT; 路径/要/ file.png
u.image＃=＆GT; file.png
 

请访问carrierwave 自述获得更广泛的例子。

An Image model has a 1:1 association with an Organization model. In the organizations controller, the create method calls on an Image model method called upload_file.

def create
  @organization = Organization.new(new_params)
  if @organization.save
    Image.upload_file(@organization.id)
  end
end

The upload_file method uses a carrierwave uploader to store a standard file in an Amazon S3 bucket. To this end, the Image model includes mount_uploader :file_name, ImageUploader.

My question is how to create an Image instance for the uploaded file? The path to the stored file should be stored in the column file_name in the Image model. And the organization associated with the image should be stored in the column organization_id in the Image model. How can I do this? More specifically, what code should I add for this to the model method below? (also see the comments in the method below.

def self.upload_file(organization_id)
  file = 'app/assets/emptyfile.xml'
  uploader = ImageUploader.new
  uploader.store!(file)
  # Am I correct to assume that the previous line uploads the file using the uploader, but does not yet create an Image record?
  # If so, then perhaps the next line should be as follows?:
  # Image.create!(organization_id: organization_id, filename: file.public_url)
  # I made up "file.public_url". What would be the correct code to include the path that the uploader stored the image at (in my case an Amazon S3 bucket)?
end

Currently in rails console I get the following error:

>> uploader = ImageUploader.new
=> #<ImageUploader:0x00000005d24f88 @model=nil, @mounted_as=nil, @fog_directory=nil>
>> file = 'app/assets/emptyfile.xml'
=> "app/assets/emptyfile.xml"
>> uploader.store!(file)
CarrierWave::FormNotMultipart: CarrierWave::FormNotMultipart
  from /usr/local/rvm/gems/ruby-2.2.1/gems/carrierwave-0.10.0/lib/carrierwave/uploader/cache.rb:120:in `cache!'
  etc.

You don't have to call the uploader yourself. Carrierwave comes with a mechanism to do the uploading and storing in AR models for you:

class Organization < ActiveRecord::Base
  mount_uploader :image, ImageUploader
end

Then you can do

u = Organization.new
u.image = params[:file] # Assign a file like this, or

# like this
File.open('somewhere') do |f|
  u.image = f
end

u.save!
u.image.url # => '/url/to/file.png'

u.image.current_path # => 'path/to/file.png'
u.image # => 'file.png'

Please visit the carrierwave README for more extensive examples.