将参数传递给上传者/从上传者内部访问模型的属性/让用户选择缩略图大小

发布于 2024-12-09 04:49:54 字数 308 浏览 0 评论 0原文

我想将图像裁剪为用户从列表中选择的尺寸（例如 100x100px、200x200px...）我如何将该属性传递给上传者或从上传者中获取模型的属性？

从上传器内部访问模型的属性如下不起作用：

version :thumb do
    thumbnail_size = model.thumbnail_size
    ...
    ...
end

我收到以下错误：

# 的未定义局部变量或方法“model”

谢谢！弗洛里安

原文

I would like to crop an image to the size the user has selected from a list (e.g. 100x100px, 200x200px,...)
How would I pass that attribute to the uploader or get the model's attribute from within the uploader?

Accessing the model's attribute from within the uploader as following does not work:

version :thumb do
    thumbnail_size = model.thumbnail_size
    ...
    ...
end

I get following error:

undefined local variable or method `model' for #

Thank you!
Florian

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我的奇迹 2024-12-16 04:49:54

为了能够访问模型的属性，我必须添加一个操作助手。

class MyUploader < CarrierWave::Uploader::Base
  ...

  version :thumb do
    process :custom_thumbnail
    process :convert => 'jpg'
    ...
  end

  def custom_thumbnail
      width =  model.get_image_width     
      height = model.get_image_height

      manipulate! do |img|
        img.convert "#{width}x#{height}"
        img
      end
  end
end

In order to be able to access the model's attribute I had to add a manipulation helper.

class MyUploader < CarrierWave::Uploader::Base
  ...

  version :thumb do
    process :custom_thumbnail
    process :convert => 'jpg'
    ...
  end

  def custom_thumbnail
      width =  model.get_image_width     
      height = model.get_image_height

      manipulate! do |img|
        img.convert "#{width}x#{height}"
        img
      end
  end
end

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