Rails回形針從其他風格生成縮略圖

我遵循jcrop rails教程，但我碰到了一個障礙。事實上，回形針是從原始文件生成縮略圖，但我需要它從另一種樣式生成。原始文件在產品鏡頭和文檔邊緣之間沒有空格。所以我不能進一步收穫。爲了解決這個問題，我製作了另一種具有白色像素填充的風格。這就是我想從中生成縮略圖的原因。Rails回形針從其他風格生成縮略圖

# croppable is the one with the padding...it's what shows up in the crop view. 
# I want :thumb to be generated from THAT style, not :original. 
# When generating from :original, the crop offset/size is screwed because the dimensions of :original don't match :cropped 
# and I can't crop beyond the pixel dimensions of :original. 
has_attached_file :photo, :styles => { 
        :thumb => { :geometry => "300x300#", :format => :jpg, :processors => [:cropper] }, 
        :general => ["150x375", :jpg], 
        :show => ["x425", :jpg], 
        :croppable => ["1200x1200>", :jpg] 
     }, 
     :url => "/assets/wines/:style/:wine_name", 
     :path => ":rails_root/public:url", 
     :default_url => ":wine_default", 
     :default_path => ":rails_root/public:wine_default", 
     :default_style => :show, 
     :convert_options => { 
      :thumb => '-gravity center -rotate -30', 
      :croppable => '-gravity center -extent 1200x1200', 
      :general => '-gravity center -extent 150x375 -quality 95', 
      :all => '-quality 100 -antialias -flatten -background white -unsharp 0.3x0.3+5+0' 
     }, 
     :processors => [:thumbnail, :compression]

來源

2013-10-24 JakeTheSnake

我遇到了一個處理器，其他人已經在線並將其用於自己。有關高級使用信息，請參閱http://pjkh.com/articles/speeding-up-thumbnail-generation-with-paperclip/。

recursive_thumbnail.rb（LIB中包含/ paperclip_processors）

module Paperclip 
    class RecursiveThumbnail < Thumbnail 
     def initialize file, options = {}, attachment = nil 
     super Paperclip.io_adapters.for(attachment.styles[options[:thumbnail] || :original]), options, attachment 
     end 
    end 
end

和模型：

:styles => { 
    :croppable => ["1200x1200>", :jpg], 
    :show => ["x425", :jpg], 
    :general => ["150x375", :jpg], 
    :thumb => { 
     :geometry => "150x150^", 
     :format => :jpg, 
     :processors => [:recursive_thumbnail] }, 
     :thumbnail => :croppable 
    }

來源

2013-10-28 19:45:12 JakeTheSnake

也許這會幫助你或別人像我這樣誰谷歌導致這一題。

https://github.com/thoughtbot/paperclip/wiki/Thumbnail-Generation

生成/再生的縮略圖

注：爲所有其他樣式描述了一些下面的例子中會導致斷路徑/網址只有再生的幾個定義樣式之一如果您的paperclip_defaults [：path]中有：hash，並且在您的paperclip_defaults [：hash_data]中有：updated_at（並且您有默認值）。除非你真的知道你在做什麼，否則不要這樣做。

您可以使用Paperclip的耙子任務（重新）生成縮略圖。使用我們上面的示例類：
bundle exec rake paperclip:refresh:thumbnails CLASS=User 

來源

2017-09-14 11:59:17 Magne

Rails回形針從其他風格生成縮略圖

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