impress/app/models/neopets_user.rb

require 'open-uri'

class NeopetsUser
  include ActiveModel::Conversion
  extend ActiveModel::Naming

  attr_accessor :username
  attr_reader :hangers, :list_id

  def initialize(app_user)
    @app_user = app_user
  end

  def list_id=(list_id)
    # TODO: DRY up with ClosetPage
    @list_id = list_id
    if list_id == 'true'
      @closet_list = nil
      @hangers_owned = true
    elsif list_id == 'false'
      @closet_list = nil
      @hangers_owned = false
    elsif list_id.present?
      @closet_list = @app_user.closet_lists.find(list_id)
      @hangers_owned = @closet_list.hangers_owned?
    end
  end

  def load!
    user = Neopets::User.new(@username)
    
    begin
      pets = user.pets
    rescue Neopets::User::Error => e
      raise NotFound, e.message
    end

    pets = pets.map { |pet| Pet.find_or_initialize_by_name(pet.name) }
    items = pets.each(&:load!).map(&:items).flatten
    item_ids = items.map(&:id)
    item_quantities = {}
    items.each do |i|
      item_quantities[i] ||= 0
      item_quantities[i] += 1
    end

    # TODO: DRY up with ClosetPage
    # We don't want to insert duplicate hangers of what a user owns if they
    # already have it in another list (e.g. imports to Items You Own *after*
    # curating their Up For Trade list), so we check for the hanger's presence
    # in *all* items the user owns or wants (whichever is appropriate for this
    # request).
    hangers_scope = @app_user.closet_hangers.where(owned: @hangers_owned)
    existing_hanger_item_ids = hangers_scope.select(:item_id).
      where(item_id: item_ids).map(&:item_id)

    @hangers = []
    item_quantities.each do |item, quantity|
      next if existing_hanger_item_ids.include?(item.id)
      hanger = hangers_scope.build
      hanger.item = item
      hanger.quantity = quantity
      hanger.list = @closet_list
      @hangers << hanger
    end
  end

  def save_hangers!
    ClosetHanger.transaction { @hangers.each(&:save!) }
  end

  def persisted?
    false
  end
  
  class NotFound < RuntimeError; end
end