CarrierWave + Cloudinary：链式转换/作物和规模

Question

我无法弄清楚如何进行链式转换。

给定一张图片，我想将其应用“垫裁剪”（example / doc），例如：

cloudinary_transformation transformation: [{ width: 450, height: 450, crop: :pad }]

然后，用户将crop the padded image with JCrop or whatever，所以我将存储crop_x、crop_y和crop_width，然后，我想要这个裁剪图像的多个尺寸，比如200x200:thumb。

我有什么：

# Image version used for cropping
version :large do
  cloudinary_transformation transformation: [{  width: 450, height: 450, crop: :pad }]
end

# A 200x200 version of the cropped image
version :thumb do
  cloudinary_transformation transformation: [{  width: 200, height: 200, crop: :pad }]
  process :crop_thumb
end

def crop_thumb
  return { x:      model.crop_x,
           y:      model.crop_y,
           width:  model.crop_width,
           height: model.crop_width,
           crop:   :pad }
end

但是结果图片的宽度是crop_width而不是200，当然……

Answer 1

这是我最终做到的：

version :thumb do
  process :crop_thumb
end

def crop_thumb
  transformations = []
  transformations << { x: model.crop_x, y: model.crop_y, width: model.crop_width, height: model.crop_width, crop: :crop }
  transformations << { width: 200, height: 200, crop: :fill }
  { transformation: transformations }
end