catstodon/app/models/preview_card.rb

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# frozen_string_literal: true
class PreviewCard < ApplicationRecord
IMAGE_MIME_TYPES = ['image/jpeg', 'image/png', 'image/gif'].freeze
belongs_to :status
has_attached_file :image, styles: { original: '120x120#' }, convert_options: { all: '-quality 80 -strip' }
validates :url, presence: true
validates_attachment_content_type :image, content_type: IMAGE_MIME_TYPES
validates_attachment_size :image, less_than: 1.megabytes
def save_with_optional_image!
save!
rescue ActiveRecord::RecordInvalid
self.image = nil
save!
end
end