在不使用外部gem的情況下將文件上傳到db Rails 3

Question

我有一個任務，需要在Rails 3.2中上載文件（.txt），而無需使用任何外部gem來完成腿工作（恐怕無法商議）文件也需要保存到數據庫中。 我有以下代碼，但是當我嘗試使用表單上傳/創建新附件時，它會返回錯誤；

No route matches [POST] "/attachments/create" 

看起來好像不是使用模型中的upload_file調用了create動作，但是我不確定如何糾正它。 如果有人能指出我正確的方向，將不勝感激。

所以我的代碼如下：

AttachmentsController.rb

class AttachmentsController < ApplicationController

 def show
   @attachment = Attachment.find(params[:id])
   end_data @attachment.data, :filename => @attachment.filename, :type =>  @attachment.content_type
 end

 def create      
   return if params[:attachment].blank?

   @attachment = Attachment.new
   @attachment.uploaded_file = params[:attachment]

   if @attachment.save
      flash[:notice] = "Thank you for your submission..."
      redirect_to root_path
   else
      flash[:error] = "There was a problem submitting your attachment."
      render "new"
     end
   end
  end

Attachment.rb

class Attachment < ActiveRecord::Base

 def uploaded_file=(incoming_file)
   self.filename = incoming_file.original_filename
   self.content_type = incoming_file.content_type
   self.data = incoming_file.read
 end

 def filename=(new_filename)
   write_attributes("filename", sanitize_filename(new_filename))
 end

 private

 def santize_filename(filename)
   just_filename = File.basename(filename)
   just_filename.gsub(/[^\w\.\-]/, '_')
  end
 end

views / attachments / new.html.erb

<%= form_tag('create', multipart: true) do %>
  <%= file_field_tag 'attachment' %>
  <%= submit_tag "upload", class: 'btn btn-primary' %>
<% end %>

routes.rb

 resources :attachments

耙路

    attachments GET    /attachments(.:format)          attachments#index
                POST   /attachments(.:format)          attachments#create
 new_attachment GET    /attachments/new(.:format)      attachments#new
edit_attachment GET    /attachments/:id/edit(.:format) attachments#edit
     attachment GET    /attachments/:id(.:format)      attachments#show
                PUT    /attachments/:id(.:format)      attachments#update
                DELETE /attachments/:id(.:format)      attachments#destroy
           root        /                               static_pages#home

還有堆棧信息

在2012-07-30 22:21:57 +0100為127.0.0.1開始發布POST“ / attachments / create”

ActionController::RoutingError (No route matches [POST] "/attachments/create"):
actionpack (3.2.3) lib/action_dispatch/middleware/debug_exceptions.rb:21:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.3) lib/rails/rack/logger.rb:26:in `call_app'
railties (3.2.3) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.1) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.3) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.1) lib/rack/lock.rb:15:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/static.rb:62:in `call'
railties (3.2.3) lib/rails/engine.rb:479:in `call'
railties (3.2.3) lib/rails/application.rb:220:in `call'
rack (1.4.1) lib/rack/content_length.rb:14:in `call'
railties (3.2.3) lib/rails/rack/log_tailer.rb:14:in `call'
rack (1.4.1) lib/rack/handler/webrick.rb:59:in `service'
/Users/garyrogers/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
/Users/garyrogers/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
/Users/garyrogers/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'

不知道從這里去哪里。

Answer 1

而不是這樣寫：

<%= form_tag('create', multipart: true) do %>

嘗試：

<%= form_tag({:controller => 'attachment', :action => 'create'}, :multipart => true) do %>

您可以從此處找到很多很好的示例： http : //guides.rubyonrails.org/form_helpers.html

此外，您可能需要更改此行：

<%= submit_tag "upload", class: 'btn btn-primary' %>

至：

<%= submit_tag "upload", :class => 'btn btn-primary' %>

希望能幫助到你

更新（截至2013年10月22日）：最初的答案是在我剛開始學習Rails（舊版ruby 1.8.7）時寫的。 :class => "btn"和class: "btn"是相同的，實際上后者在ruby 1.9及更高版本中受青睞。

Answer 2

你有rake routes嗎？ 像這樣的資源的寧靜路線可能只是'/attachments'的POST。請看http://guides.rubyonrails.org/routing.html#crud-verbs-and-actions