ruby on rails - Rmagick composite image without source -


i have gallery model , post model. each post has image, , create composite image each gallery based on posts in gallery. have method galleries returns urls top 4 images in gallery:

gallery.images_for_preview # => returns array of 4 image urls (200x200 images)

i'm using carrierwave + rmagick generate composite image. i'm trying follow along here: http://railscasts.com/episodes/374-image-manipulation seems use case different. have:

class galleryimageuploader < carrierwave::uploader::base   ...   def store_dir     "galleries/#{model.obfuscated_id}"   end    version("full") { process :full_image }    def full_image     images = model.images_for_preview     puts images     manipulate! format: "png"       image0 = magick::image.read(images[0]).first       image1 = magick::image.read(images[1]).first       image2 = magick::image.read(images[2]).first       image3 = magick::image.read(images[3]).first       underlay = magick::image.new(406, 406) { self.background_color = "#333333" }       underlay.composite!(image0, 2, 2, magick::overcompositeop).composite!(image1, 204, 2, magick::overcompositeop).composite!(image2, 2, 204, magick::overcompositeop).composite!(image3, 204, 204, magick::overcompositeop)     end   end

the full_image operation doesn't require source file, way can seem generate composite image like:

gallery.remote_image_url = "path/to/image"

which generates image need @ /galleries/:id/full_image.png processes , generates image @ /galleries/:id/image.png

is possible skip "source" image , generate composite, upload imageuploader's primary image?

yes, process data on go, no need version itself:

replace line:

  version("full") { process :full_image }

with one

  process :full_image

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