如何将可变水印路径传递给回形针水印处理器? [英] How do I pass a variable watermark path to a paperclip watermark processor?

问题描述

我有水印、画廊和照片模型.

I have watermarks, galleries, and photos models.

图库 belongs_to 水印照片 belongs_to 图库

Gallery belongs_to Watermark Photo belongs_to Gallery

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，我得到未定义的局部变量或方法'gallery'.如果我尝试使用使用 Paperclip.interpolations 定义的 :gallery_watermark_path ，它会默默地失败.

With this I get undefined local variable or method 'gallery'. If I try like this with :gallery_watermark_path defined using Paperclip.interpolations it silently fails.

:watermark_path => ":gallery_watermark_path"

:gallery_watermark_path 不会被 Paperclip.interpolations 处理:

The :gallery_watermark_path doesn't get processed by Paperclip.interpolations:

development.log:

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?

In short, how do I pass the watermark variable to the processor?

推荐答案

watermark_path 需要是一个路径名，尝试使用 Rails.root.join 像这样:

The watermark_path needs to be a Pathname, try to use Rails.root.join like this:

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

希望对你有帮助

干杯.

这篇关于如何将可变水印路径传递给回形针水印处理器?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！