Ruby on rails 下载Rails资产-开发与生产中的文件路径

我有一个

downloads\u controller.rb

和一个

download

操作，我想触发下载一个文件，该文件位于名为

downloads

的文件夹中，该文件夹位于我添加到资产路径中的名为

download\u assets

的文件夹中

- download_assets [Added to asset paths]
   - downloads
      - file_1.pdf
      - file_2.pdf
      ...

我可以使用以下方法成功访问文件夹中的任何文件：

为了使用send_file，我需要该文件的文件系统路径，而不是URL。我可以使用

Rails.root

获取Rails项目的根路径，使用

asset\u path（path）

获取文件的路径。然而，问题是因为我正在开发中，所以在这个路径上没有文件。该文件存储在：

path/to/rails/project/app/assets/download_assets/downloads/file.pdf

行动：

   def download
      @download = Download.find(params[:id])
      file_path = "downloads/#{@download.filename}.pdf"
      file_path = "#{Rails.root}#{ActionController::Base.helpers.asset_path(file_path)}"
      send_file(file_path, :type=>"application/pdf", x_sendfile: true)
   end

要使其在开发中发挥作用，我需要使用以下方法：

"#{Rails.root}/app/assets/download_assets/#{file_path}"

但是，这将在生产中失败，因为资产将被预编译并移动到

资产中

我目前的解决办法是：

   file_path = "downloads/#{@download.filename}.pdf"
   if Rails.env == "development" || Rails.env == "test"
        file_path = "#{Rails.root}/app/assets/download_assets/#{file_path}"
    else
        file_path = "#{Rails.root}{ActionController::Base.helpers.asset_path(file_path)}"
    end

是否有其他方法可以根据环境提供不同的路径，因为这似乎很脆弱？是的

在
/config/initializers
中创建一个名为say“
config.yml
”的文件，如下所示进行设置：

config.yml:

---
## NOT a tab character.  3 spaces.  (In case that affects you)                                                                                                                            
development:
   path_to_uploads: /path/to/downloads/for/development

production:
   path_to_uploads: /path/to/downloads/for/production

test:
   path_to_uploads: /path/to/downloads/for/test

APP_CONFIG = YAML.load_file("#{Rails.root}/config/initializers/config.yml")

      class FooController < ApplicationController
           def download
              # ... 
              path_to_uploads = Rails.root.to_s + APP_CONFIG["#{Rails.env}"]['path_to_uploads'] 
## By handing it the Rails.env object, it will return the current environment and handle selecting the correct environment for you.
        end
    end

然后在同一目录（
/config/initializers/
）中创建一个名为
config.rb

config.rb:

---
## NOT a tab character.  3 spaces.  (In case that affects you)                                                                                                                            
development:
   path_to_uploads: /path/to/downloads/for/development

production:
   path_to_uploads: /path/to/downloads/for/production

test:
   path_to_uploads: /path/to/downloads/for/test

APP_CONFIG = YAML.load_file("#{Rails.root}/config/initializers/config.yml")

      class FooController < ApplicationController
           def download
              # ... 
              path_to_uploads = Rails.root.to_s + APP_CONFIG["#{Rails.env}"]['path_to_uploads'] 
## By handing it the Rails.env object, it will return the current environment and handle selecting the correct environment for you.
        end
    end

跳到您的控制器：

foo\u controller.rb:

---
## NOT a tab character.  3 spaces.  (In case that affects you)                                                                                                                            
development:
   path_to_uploads: /path/to/downloads/for/development

production:
   path_to_uploads: /path/to/downloads/for/production

test:
   path_to_uploads: /path/to/downloads/for/test

APP_CONFIG = YAML.load_file("#{Rails.root}/config/initializers/config.yml")

      class FooController < ApplicationController
           def download
              # ... 
              path_to_uploads = Rails.root.to_s + APP_CONFIG["#{Rails.env}"]['path_to_uploads'] 
## By handing it the Rails.env object, it will return the current environment and handle selecting the correct environment for you.
        end
    end

class FooController

在使用YAML查找环境方面有一个很好的RailsCast

希望有帮助