Ruby on Rails - 回形针 - NoHandleError

Question

在 Ruby on Rails 上使用回形针 gem 设置多态文件上传时出错。
下面，我将向您展示相关的代码部分。

我已经设置了一个 _form 部分：

<%= form_for(@test_run, :html => { :multipart => true }) do |f| %>
<div class="row">
  <div class="large-6 columns">

    <%= fields_for :attachment do |attachment_fields| %>
        <%= attachment_fields.file_field :attachment %><br />
    <% end %>

    <%= f.label :name %>
    <%= f.text_field :name %>

    <%= f.submit t('buttons.general.save'), :class => "button slim", data: {disable_with: "#{t('buttons.general.disable')}"}, :alt => t('buttons.general.save'),:title => t('buttons.general.save') %>
  </div>
</div>

我的附件模型包含文件验证：

class Attachment < ActiveRecord::Base
  belongs_to :attachable, :polymorphic => :true

  has_attached_file :attachment
  validates_attachment_content_type :attachment, content_type: /\A(image|application)\/.*\z/
end

在附件控制器中，我将以下参数列入白名单：

def attachment_params
  params.require(:attachment).permit(:name, :user_id, :attachable_id, :attachable_type, :attachedfile)
end

附件应附加到测试运行。这是测试运行模型：

class TestRun < ActiveRecord::Base
  belongs_to :test_object

  has_many :attachments, :as => :attachable

  accepts_nested_attributes_for :attachments
end

测试运行控制器的创建方法和私有方法也可能相关：

def create
  @test_run = TestRun.new(test_run_params)

  attachment = Attachment.create(:attachable_id => @test_run_id, :attachment => params[:attachment])

  render text: @test_run.attachments.first.inspect
end

private
  # Use callbacks to share common setup or constraints between actions.
  def set_test_run
    @test_run = TestRun.find(params[:id])
  end

  # Never trust parameters from the scary internet, only allow the white list through.
  def test_run_params
    params.require(:test_run).permit(:name, :test_object_id, :attachment, :start_time, :end_time, :test_demands, :allowed_bug_types, :max_testers, :test_language, :postprocessing_time, :test_standards, :target_tester, :target_devices)
  end

为了给你一个完整的概述，这里是附件迁移文件：

class CreateAttachments < ActiveRecord::Migration
  def change
    create_table :attachments do |t|
      t.string :name
      t.integer :user_id
      t.integer :attachable_id
      t.string :attachable_type

      t.timestamps null: false
    end
  end
end

现在，当我运行此程序时，填写表单并选择一个有效文件并在此之后提交表单，我收到以下错误：

TestRunsController 中的Paperclip::AdapterRegistry::NoHandlerError #create
好吧，不知何故，stackoverflow 缩小了错误信息，所以我把它放在pastebin 上。

如果希望，你们中的某个人可以帮助我，因为我在研究错误的日子以来一直在这一点上。
谢谢！

Answer 1

运行迁移：

rails generate paperclip attachment attachment

在你看来：

<%= fields_for :attachment do |field| %>
    <%= field.file_field :attachment %><br />
<% end %>

你的attachment_params

def attachment_params
  params.require(:attachment).permit(:name, :user_id, :attachable_id, :attachable_type, :attachment)
end

你的方法create

def create

  @test_run = TestRun.new(test_run_params)

  attachment = Attachment.create(attachment_params)

  render text: @test_run.attachments.first.inspect
end

你还必须包含在这个控制器方法中attachment_params