Contents

# frozen_string_literal: true
require "redcarpet"

module BitCore
  # A collection of ordered Slides.
  class Slideshow < ActiveRecord::Base
    belongs_to :arm

    has_many :slides,
             -> { order "position" },
             class_name: "BitCore::Slide",
             foreign_key: :bit_core_slideshow_id,
             dependent: :destroy,
             inverse_of: :slideshow
    has_one :content_provider,
            as: :source_content,
            dependent: :nullify

    validates :arm_id, :title, presence: true

    accepts_nested_attributes_for :slides

    def pretty_title
      return "" if title.nil?

      Redcarpet::Markdown.new(
        Redcarpet::Render::HTML.new(
          filter_html: true,
          safe_links_only: true
        ),
        space_after_headers: true
      ).render(title).html_safe
    end

    def add(slide_params)
      slide = slides.build(slide_params)
      slide.position = slides.count + 1

      slide
    end

    def remove(slide)
      return false unless slide.destroy

      (slide.position + 1..slides.last.position).each do |pos|
        slides.find_by_position(pos).update(position: pos - 1)
      end

      true
    end

    def sort(ordered_ids)
      self.class.transaction do
        self.class.connection.execute "SET CONSTRAINTS " \
                                      "bit_core_slide_position DEFERRED"
        ordered_ids.each_with_index do |id, idx|
          slides.find(id).update_attribute(:position, idx + 1)
        end
      end
    end
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
bit_core-1.4.7	app/models/bit_core/slideshow.rb
bit_core-2.0.0.beta2	app/models/bit_core/slideshow.rb