openfoodnetwork/app/serializers/api/admin/enterprise_serializer.rb

class Api::Admin::EnterpriseSerializer < ActiveModel::Serializer
  attributes :name, :id, :is_primary_producer, :is_distributor, :sells, :category, :permalink,
             :payment_method_ids, :shipping_method_ids, :producer_profile_only, :long_description,
             :preferred_shopfront_message, :preferred_shopfront_closed_message,
             :preferred_shopfront_taxon_order, :preferred_shopfront_order_cycle_order,
             :preferred_product_selection_from_inventory_only,
             :owner, :contact, :users, :tag_groups, :default_tag_group,
             :require_login, :allow_guest_orders, :allow_order_changes,
             :logo, :promo_image

  has_one :owner, serializer: Api::Admin::UserSerializer
  has_many :users, serializer: Api::Admin::UserSerializer
  has_one :address, serializer: Api::AddressSerializer

  def logo
    attachment_urls(object.logo, [:thumb, :small, :medium])
  end

  def promo_image
    attachment_urls(object.promo_image, [:thumb, :medium, :large])
  end

  def tag_groups
    object.tag_rules.prioritised.reject(&:is_default).each_with_object([]) do |tag_rule, tag_groups|
      tag_group = find_match(tag_groups, tag_rule.preferred_customer_tags.
                                           split(",").
                                           map{ |t| { text: t } })
      if tag_group[:rules].blank?
        tag_groups << tag_group
        tag_group[:position] = tag_groups.count
      end
      tag_group[:rules] << Api::Admin::TagRuleSerializer.new(tag_rule).serializable_hash
    end
  end

  def default_tag_group
    default_rules = object.tag_rules.select(&:is_default)
    serialized_rules =
      ActiveModel::ArraySerializer.new(default_rules,
                                       each_serializer: Api::Admin::TagRuleSerializer)
    { tags: [], rules: serialized_rules }
  end

  def find_match(tag_groups, tags)
    tag_groups.each do |tag_group|
      return tag_group if tag_group[:tags].length == tags.length &&
                          (tag_group[:tags] & tags) == tag_group[:tags]
    end
    { tags: tags, rules: [] }
  end

  private

  # Returns a hash of URLs for specified versions of an attachment.
  #
  # Example:
  #
  #   attachment_urls(object.logo, [:thumb, :small, :medium])
  #   # {
  #   #   thumb: LOGO_THUMB_URL,
  #   #   small: LOGO_SMALL_URL,
  #   #   medium: LOGO_MEDIUM_URL
  #   # }
  def attachment_urls(attachment, versions)
    return unless attachment.file?

    versions.each_with_object({}) do |version, urls|
      urls[version] = attachment.url(version)
    end
  end
end