PartAdvertisment model

part_advertisment.rb

class PartAdvertisment < ActiveRecord::Base
  # fields, for sorting in view (name => order_by field)
  SORTING_FIELDS = {
      'Город'  => 'cities.title',
      'Модель' => 'transport_models.title',
      ' '      => ' ', # gap 
      'Цена'   => 'price'
    }

  # Advertisment-related behaviour. see lib/behaviours/advertisable.rb
  include Behaviours::Advertisable

  has_many   :part_adv_photos,  dependent: :destroy
  has_many   :part_prop_values, dependent: :destroy
  has_many   :part_properties,  through:   :transport_model
  
  has_and_belongs_to_many :part_tags
  has_and_belongs_to_many :wish_lists

  accepts_nested_attributes_for :part_prop_values, reject_if: proc { |attributes| attributes['value'].blank? }

  # scopes, finders
  extend Finders::PartFinders
  scope :immediate,     -> { where(is_immediate: true) }
  scope :not_immediate, -> { where(is_immediate: nil) }
  scope :is_new,    -> { where(is_new: true) }
  scope :universal, -> { where(transport_model_id: nil) }
  scope :includes_relations,    -> { includes(:city, :part_adv_photos, :transport_model => :transport_brand) }

  # Increment/decrement part_adv_count column in TransportBrand model
  after_create { transport_brand.increment!(:part_adv_count) if transport_model.present? }
  after_destroy { transport_brand.decrement! :part_adv_count if transport_model.present? }

  def more_for_this_owner
    if self.company.present?
      self.company.part_advertisments.active.includes_relations.where.not(:id => self.id)
    elsif self.user.present?
      self.user.part_advertisments.active.includes_relations.where.not(:id => self.id)
    else
      PartAdvertisment.none
    end
  end

  def first_image
    part_adv_photos.first || part_adv_photos.create!
  end

  def xx_small_preview
    first_image.image.xx_small_preview.url
  end

  def adv_small_preview
    first_image.image.adv_small_preview.url
  end

  def immediate_preview
    first_image.image.adv_large_preview.url
  end

  # this method is called from Payment
  def payment_price
    PRICE
  end

  # array of arguments for url generation after Payment
  def path_arguments
    if transport_model_id
      [transport_brand, transport_model, self]
    else
      # unbinded part (universal)
      [self]
    end
  end

end