Rails RMagick输出载波

Question

我正在使用RMagick gem制作一个rails应用程序，将图像转换为动画gif。有< code>Post模型，其中< code >有_many post_attachments和< code >有_one post_output。这个想法是用户可以上传多张图片，然后重定向到一个带有动画gif的页面。我在通过carrierwave、AWS S3和fog将gif附加到post_output(它有一个名为‘output’的属性)时遇到了问题。

posts_controller.rb

def create
  @post = Post.new(post_params)

  if @post.save
    @post_attachments = params[:post_attachments][:image].map do |attachment|
      @post.post_attachments.create!(image: attachment)
    end

    images = @post_attachments.map { |attachment| attachment.image.url  }
    gif = Magick::ImageList.new(*images)
    gif.to_blob
    gif.delay = 20
    filename = "#{@post.title}.gif"
    gif.write(filename)

    binding.pry
    @post.post_output.create!(output: gif)


    flash.now[:success] = "Post was succesfully created!"
    redirect_to @post

  else
    flash.now[:danger] = "Something went wrong. Try again. :("
    render 'new'
  end
end

def post_params
    params.require(:post).permit(:title,
    post_attachments_attributes: [:id, :post_id, :image],
    post_output_attributes: [:id, :post_id, :output])
end

后.rb

class Post < ActiveRecord::Base
  has_many :post_attachments, dependent: :destroy
  has_one :post_output,     dependent: :destroy
  accepts_nested_attributes_for :post_attachments
  accepts_nested_attributes_for :post_output

  validates :title, presence: true
end  

post_output.rb

class PostOutput < ActiveRecord::Base
  belongs_to :post
  mount_uploader :output, OutputGifUploader

  validates :output, presence: true
end  

output_gif_uploader.rb

class OutputGifUploader < CarrierWave::Uploader::Base

  include CarrierWave::RMagick

  storage :fog

  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end

end

这是日志和错误:

于2015-07-27 17:56:32-0400由PostsController#创建为HTML参数：｛“utf8”=

< code>NameError(未初始化的常量Post::Post outputs):app/controllers/posts _ controller . Rb:22:in create ' `中

渲染/Users/AYL/.rvm/rubies/ruby-2.1.5/lib/ruby/gems/2.1.0/gems/actionpack-4.2.0/lib/action_dispatch/middleware/templates/rescues/_source。erb（8.3ms）渲染/Users/AYL/.rvm/rubies/ruby-2.1.5/lib/ruby/gems/2.1.0/gems/actionpack-4.2.0/lib/action_dispatch/midleware/templates/rescues/_trace.html。erb（4.2ms）渲染/Users/AYL/.rvm/rubies/ruby-2.1.5/lib/ruby/gems/2.1.0/gems/actionpack-4.2.0/lib/action_dispatch/midleware/templates/rescues/_request_and_response.html。erb（1.8ms）渲染/Users/AYL/.rvm/rubies/ruby-2.1.5/lib/ruby/gems/2.1.0/gems/actionpack-4.2.0/lib/action_dispatch/middleware/templates/suces/diagnostics.html。救援/布局中的erb（33.1ms）无法呈现内容类型为multipart/form data的控制台允许的内容类型：[##

做这件事的正确方法是什么？

Answer 1

解决方案
posts_controller.rb做
@post.create_post_output！（输出：File.open（文件名））
而不是
@post.post_output.create！（输出：gif）