Ruby on Rails-Carrierwave获取图像尺寸的宽度和高度 [英] Ruby on Rails - Carrierwave get the image dimension width and height

问题描述

我需要知道当前载波的宽度和高度

I need to know the width and height of the current instance of carrierwave

例如：

image_tag image.photo_url,:width => image.photo.width, :height => image.photo.height

但是问题是image.photo.width和image.photo.height

But the problem is that image.photo.width and image.photo.height are not working.

任何想法吗？

推荐答案

安装ImageMagick，RMagick或MiniMagick。然后打开文件（图像），然后找出其高度。

You have to install ImageMagick, RMagick or MiniMagick. Then you open the file (image) before you can find out its height.

示例： https://github.com/jnicklas/carrierwave#conditional-versions （请参见is_landscape？方法），复制到此处：

Example: https://github.com/jnicklas/carrierwave#conditional-versions (see the is_landscape? method), copied here:

  def is_landscape? picture
    image = MiniMagick::Image.open(picture.path)
    image[:width] > image[:height]
  end

或其他相关问题：

载波和mini_magick查找宽度&高度

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