foodsoft/app/models/stock_article.rb

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# encoding: utf-8
class StockArticle < Article
has_many :stock_changes
scope :available, -> { undeleted.where'quantity > 0' }
before_destroy :check_quantity
# Update the quantity of items in stock
def update_quantity!
update_attribute :quantity, stock_changes.collect(&:quantity).sum
end
# Check for unclosed orders and substract its ordered quantity
def quantity_available
quantity - OrderArticle.where(article_id: id).
joins(:order).where("orders.state = 'open' OR orders.state = 'finished'").sum(:units_to_order)
end
def self.stock_value
available.collect { |a| a.quantity * a.gross_price }.sum
end
def mark_as_deleted
check_quantity
super
end
protected
def check_quantity
raise "#{name} kann nicht gelöscht werden. Der Lagerbestand ist nicht null." unless quantity == 0
end
# Overwrite Price history of Article. For StockArticles isn't it necessary.
def update_price_history
true
end
end