如何将可变水印路径传递给回形针水印处理器？

Question

我有水印,画廊和照片模型.

图库belongs_to水印照片belongs_to库

class Photo < ActiveRecord::Base
  before_save :save_dimensions, :set_orientation
  belongs_to :gallery

  has_attached_file :image,
    :processors => [:watermark],
    :styles => {
      :thumbnail => ["80x80>"],
      :small => {
        :geometry => "200x200>",
        :watermark_path => "#{gallery.watermark.image.path(:small)}",
        :position => "Center"
      },
      :medium => {
        :geometry => "400x400>",
        :watermark_path => "#{gallery.watermark.image.path(:medium)}",
        :position => "Center"
      },
      :large => {
        :geometry => "600x600>",
        :watermark_path => "#{gallery.watermark.image.path(:large)}",
        :position => "Center"
      }
    },
    :path => ":rails_root/public/images/galleries/:gallery_id/:id/:style_:basename.:extension",
    :url => "galleries/:gallery_id/:id/:style_:basename.:extension"
  validates_attachment_presence :image
  validates_attachment_content_type :image, :content_type => ['image/jpeg', 'image/png']
  attr_protected :image_file_name, :image_content_type, :image_file_size

end

有了这个,我得到了undefined local variable or method 'gallery'.如果我尝试:gallery_watermark_path使用Paperclip.interpolations定义它,它会默默地失败.

:watermark_path => ":gallery_watermark_path"

在:gallery_watermark_path没有得到通过Paperclip.interpolations处理:

development.log:

[paperclip] identify -format %wx%h '/tmp/stream20110620-30644-1j6i9in.jpg[0]' 2>/dev/null
[paperclip] convert '/tmp/stream20110620-30644-1j6i9in.jpg' '-resize' '80x80>' '-auto-orient' '/tmp/stream20110620-30644-1j6i9in20110620-30644-1mcqvox' 2>/dev/null
[paperclip] identify -format %wx%h '/tmp/stream20110620-30644-1j6i9in.jpg[0]' 2>/dev/null
[paperclip] convert '/tmp/stream20110620-30644-1j6i9in.jpg' '-resize' '200x200>' '-auto-orient' '/tmp/stream20110620-30644-1j6i9in20110620-30644-60zlb' 2>/dev/null
[paperclip] composite '-gravity' 'Center' ':gallery_watermark_path' '/tmp/stream20110620-30644-1j6i9in20110620-30644-60zlb' '/tmp/stream20110620-30644-1j6i9in20110620-30644-60zlb' 2>/dev/null
[paperclip] An error was received while processing: #<Paperclip::PaperclipError: There was an error processing the watermark for stream20110620-30644-1j6i9in>
[paperclip] identify -format %wx%h '/tmp/stream20110620-30644-1j6i9in.jpg[0]' 2>/dev/null
[paperclip] convert '/tmp/stream20110620-30644-1j6i9in.jpg' '-resize' '400x400>' '-auto-orient' '/tmp/stream20110620-30644-1j6i9in20110620-30644-1ronidq' 2>/dev/null
[paperclip] identify -format %wx%h '/tmp/stream20110620-30644-1j6i9in.jpg[0]' 2>/dev/null
[paperclip] convert '/tmp/stream20110620-30644-1j6i9in.jpg' '-resize' '600x600>' '-auto-orient' '/tmp/stream20110620-30644-1j6i9in20110620-30644-1ikfy72' 2>/dev/null

简而言之,如何将水印变量传递给处理器？

Answer 1

您可以使用样式的过程：

  has_attached_file :image,
    :processors => [:watermark],
    :styles => proc { |attachment|
      {
        :thumbnail => ["80x80>"],
        :small => {
          :geometry => "200x200>",
          :watermark_path => attachment.instance.gallery.watermark.image.path(:small),
          :position => "Center"
        },
        :medium => {
          :geometry => "400x400>",
          :watermark_path => attachment.instance.gallery.watermark.image.path(:medium),
          :position => "Center"
        },
        :large => {
          :geometry => "600x600>",
          :watermark_path => attachment.instance.gallery.watermark.image.path(:large),
          :position => "Center"
        }
      }
    },
    [...]

但有时，在实例获取其所有属性之前调用 proc（所以有时gallery可能是nil因为您image之前可能已经分配过gallery_id）。