class Delivery < ActiveRecord::Base belongs_to :supplier belongs_to :invoice has_many :stock_changes, -> { includes(:stock_article).order('articles.name ASC') }, :dependent => :destroy scope :recent, -> { order('created_at DESC').limit(10) } validates_presence_of :supplier_id, :delivered_on validate :stock_articles_must_be_unique accepts_nested_attributes_for :stock_changes, :allow_destroy => :true def new_stock_changes=(stock_change_attributes) for attributes in stock_change_attributes stock_changes.build(attributes) unless attributes[:quantity].to_i == 0 end end def includes_article?(article) self.stock_changes.map{|stock_change| stock_change.stock_article.id}.include? article.id end def sum(type = :gross) total = 0 for sc in stock_changes article = sc.stock_article quantity = sc.quantity case type when :net total += quantity * article.price when :gross total += quantity * article.gross_price when :fc total += quantity * article.fc_price end end total end protected def stock_articles_must_be_unique unless stock_changes.reject{|sc| sc.marked_for_destruction?}.map {|sc| sc.stock_article.id}.uniq!.nil? errors.add(:base, I18n.t('model.delivery.each_stock_article_must_be_unique')) end end end