使用Paperclip,ImageMagick,Jcrop和S3存储进行裁剪:为什么不'image.reprocess!' 重新处理？

Question

我(松散地)遵循RailsCasts教程#182,它使用Paperclip,ImageMagick和Jcrop来允许自定义裁剪上传的图像.

由于我正在使用Amazon S3进行文件存储,因此我不得不重新调整本教程的部分内容以适应.除了我的图像的裁剪版本没有被重新处理(或者重新处理的结果没有被重新上传到S3)这一切似乎完美无缺- 所以在裁剪过程之后,我离开了我最初上传的图像(我为每个图像存储的所有图像尺寸都是如此).

这是我的功能(如特征图像)模型:

class Feature < ActiveRecord::Base
  require "#{Rails.root}/lib/paperclip_processors/cropper.rb"

  attr_accessible    :image_file_name, :image
  attr_accessor      :crop_x, :crop_y, :crop_w, :crop_h
  after_update       :reprocess_image, :if => :cropping?

  if Rails.env == "production"
  S3_CREDENTIALS = { :access_key_id     => '<REDACTED>',
                     :secret_access_key => '<REDACTED>',
                     :bucket            => "<REDACTED>"}
  else
  S3_CREDENTIALS = { :access_key_id     => '<REDACTED>',
                     :secret_access_key => '<REDACTED>',
                     :bucket            => "<REDACTED>"}
  end

  has_attached_file :image,
                    :styles          => { :small => "240x135>", :croppable => "960x960>", :display => "960x540>" },
                    :processors      => [:cropper],
                    :storage         => :s3,
                    :s3_credentials  => S3_CREDENTIALS,
                    :path            => "features/:id/:style.:extension"

  validates_attachment_content_type :image, :content_type => ['image/jpeg', 'image/gif', 'image/png',
                                                              'image/pjpeg', 'image/x-png'], 
                                            :message => 'must be a JPEG, GIF or PNG image'

  def cropping?
    !crop_x.blank? && !crop_y.blank? && !crop_w.blank? && !crop_h.blank?
  end

  def image_geometry(style = :original)
    @geometry ||= {}
    path = (image.options[:storage]==:s3) ? image.url(style) : image.path(style)
    @geometry[style] ||= Paperclip::Geometry.from_file(path)
  end

  private

  def reprocess_image
    image.reprocess!
  end
end

这是我的'cropper.rb'(回形针处理器):

module Paperclip
  class Cropper < Thumbnail
    def transformation_command
      if crop_command
        crop_command + super.sub(/ -crop \S+/, '')
      else
        super
      end
    end

    def crop_command
      target = @attachment.instance
      if target.cropping?
        " -crop '#{target.crop_w}x#{target.crop_h}+#{target.crop_x}+#{target.crop_y}'"
      end
    end
  end
end

我的FeaturesController的相关操作:

class FeaturesController < ApplicationController

  def new
    @feature = Feature.new
  end

  def create
    @feature = Feature.new(params[:feature])
    if @feature.save
      if params[:feature][:image].blank?
        flash[:notice] = "New feature added!"
        redirect_to @feature
      else
        render :crop
      end
    else
      @title = "Add a New Feature"
      render :new
    end
  end

  def edit
    @feature = Feature.find(params[:id])
    @title = "Edit #{@feature.headline}"
  end

  def update
    @feature = Feature.find(params[:id])
    if @feature.update_attributes(params[:feature])
      if params[:feature][:image].blank?
        flash[:notice] = "Feature updated!"
        redirect_to @feature
      else
        render :crop
      end
    else
      @title = "Edit Feature"
      render :edit
    end
  end
end

以及''crop.html.erb'视图的相关行:

<% content_for :javascript_includes do %>
    <%= javascript_include_tag 'jquery.Jcrop.min' %>
    <script type="text/javascript" charset="utf-8">
    $(function() {
        $('#cropbox').Jcrop({
            onChange: update_crop,
            onSelect: update_crop,
            setSelect: [0, 0, 960, 540],
            aspectRatio: 960/540
        });
    });

    function update_crop(coords) {
        var ratio = <%= @feature.image_geometry(:original).width %> / <%= @feature.image_geometry(:croppable).width %>;
        $("#crop_x").val(Math.round(coords.x * ratio));
        $("#crop_y").val(Math.round(coords.y * ratio));
        $("#crop_w").val(Math.round(coords.w * ratio));
        $("#crop_h").val(Math.round(coords.h * ratio));
    };
    </script>
<% end %>
<% content_for :style_includes do %>
    <%= stylesheet_link_tag 'jquery.Jcrop', :media => 'screen' %>
<% end %>

<%= image_tag @feature.image.url(:croppable), :id => "cropbox" %>

<% form_for @feature do |f| %>
    <% for attribute in [:crop_x, :crop_y, :crop_w, :crop_h] %>
        <%= f.hidden_field attribute, :id => attribute %>
    <% end %>
    <p><%= f.submit "Crop" %></p>
<% end %>

问题不在于自定义裁剪(偏移,裁剪区域等)出现错误,而是单击"裁剪"时没有裁剪发生 - 我只剩下我从原始图像中获得的图像上传/过程.它似乎不是'image.reprocess!' 正在发生(或者重新处理的结果没有保存到S3).

为什么会这样,我能做些什么呢？

Answer 1

不知道这是否相同，但我在重新处理时遇到了问题，并按照此处的答案修复了它：

Rails 3 升级后重新处理时出现回形针错误