CODEWITHSUNDEEP
rubyactiverecordcarrierwave
JP.
JP.

Reputation: 5594

CarrierWave to update model?

CarrierWave is doing an awesome job with ActiveRecord of resizing my images as I upload them - but I'd like to be able to record whether the image is landscape or portrait in my ActiveRecord model as it's being processed - is this possible?

Upvotes: 0

Views: 614

Answers (2)

Andrew Haines
Andrew Haines

Reputation: 6644

From the README, you can use the following to determine the orientation of the picture:

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

You could use this in a before_save on your model, like in this example from the CarrierWave wiki, which I've adapted slightly:

class Asset < ActiveRecord::Base
  mount_uploader :asset, AssetUploader

  before_save :update_asset_attributes

  private

  def update_asset_attributes
    if asset.present? && asset_changed?
      self.landscape = landscape?(asset)
    end
  end

  def landscape?(picture) # ... as above ...
end

Update: To do it in the uploader, I'm not sure of the best approach. One option might be to write a custom processing method:

class AssetUploader < CarrierWave::Uploader::Base
  include CarrierWave::MiniMagick

  process :resize => [200, 200]

  private

  def resize(width, height)
    resize_to_limit(width, height) do |image|
      model.landscape = image[:width] > image[:height]
      image
    end
  end
end

which takes advantage of the fact that the MiniMagick methods yield the image for further processing, so as to avoid loading the image a second time.

Upvotes: 1

masterweily
masterweily

Reputation: 736

you can add this method to your uploader file:

include CarrierWave::RMagick

def landscape? picture
  if @file
    img = ::Magick::Image::read(@file.file).first
    img.columns > img.rows
  end
end

Upvotes: 1

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