form_object.rb

# frozen_string_literal: true
require "active_record"
require "active_model"

class Shrine
  module Plugins
    module FormObject
      def self.load_dependencies(uploader, **)
        uploader.plugin :model
        uploader.plugin :activerecord
      end

      def self.configure(uploader, **opts)
        uploader.opts[:form_object] ||= { validations: true }
        uploader.opts[:form_object].merge!(opts)
      end

      module AttachmentMethods
        def included(form_object)
          super

          return unless form_object.is_a? ::ActiveModel::Validations
          return if form_object.is_a? ::ActiveRecord::Base

          name = @name

          if shrine_class.opts[:form_object][:validations]
            form_object.validate do
              send(:"#{name}_attacher").send(:activerecord_validate)
            end
          end
        end
      end
    end

    register_plugin(:form_object, FormObject)
  end
end