Carrierwave and mini_magick finding widths & height

Question

After a bit of investigation I decided to use Carrierwave and mini_magick on my new rail3 app.

I\'ve set it up and it works perfectly. However I have a one question. I\

Answer 1

I think the best way is to store the image dimensions in the model (database).

In my case, the model name is attachment. Then I created a migration:

rails g migration add_dimensions_to_attachments image_width:integer image_height:integer

After that, run the migration:

rake db:migrate

In my Image Uploader file app/uploaders/image_uploader.rb, I have:

class ImageUploader < CarrierWave::Uploader::Base

    include CarrierWave::MiniMagick

    process :store_dimensions

    private

    def store_dimensions
      if file && model
        model.image_width, model.image_height = ::MiniMagick::Image.open(file.file)[:dimensions]
      end
    end
  end

With this, the image dimensions is saved in the upload step.

To get the dimensions, I simply run attachment.image_width or attachment.image_height

See the reference here.