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# frozen_string_literal: true
module Alchemy
# The persisted version of a rendered picture variant
#
# You can configure the generator class to implement a
# different thumbnail store (ie. a remote file storage).
#
# config/initializers/alchemy.rb
# Alchemy::PictureThumb.generator_class = My::ThumbnailGenerator
#
class PictureThumb < BaseRecord
belongs_to :picture, class_name: "Alchemy::Picture"
validates :signature, presence: true
validates :uid, presence: true
class << self
# Thumbnail generator class
#
# @see Alchemy::PictureThumb::Create
def generator_class
@_generator_class ||= Alchemy::PictureThumb::Create
end
# Set a thumbnail generator class
#
# @see Alchemy::PictureThumb::Create
def generator_class=(klass)
@_generator_class = klass
end
# Upfront generation of picture thumbnails
#
# Called after a Alchemy::Picture has been created (after an image has been uploaded)
#
# Generates three types of thumbnails that are used by Alchemys picture archive and
# persists them in the configures file store (Default Dragonfly::FileDataStore).
#
# @see Picture::THUMBNAIL_SIZES
def generate_thumbs!(picture)
Alchemy::Picture::THUMBNAIL_SIZES.values.each do |size|
variant = Alchemy::PictureVariant.new(picture, {
size: size,
flatten: true,
})
signature = Alchemy::PictureThumb::Signature.call(variant)
thumb = find_by(signature: signature)
next if thumb
uid = Alchemy::PictureThumb::Uid.call(signature, variant)
generator_class.call(variant, signature, uid)
end
end
end
end
end
Version data entries
72 entries across 72 versions & 1 rubygems