foodsoft/app/models/stock_change.rb

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# == Schema Information
# Schema version: 20090120184410
#
# Table name: stock_changes
#
# id :integer not null, primary key
# delivery_id :integer
# order_id :integer
# stock_article_id :integer
# quantity :integer default(0)
# created_at :datetime
#
class StockChange < ActiveRecord::Base
belongs_to :delivery
belongs_to :order
belongs_to :stock_article
validates_presence_of :stock_article_id, :quantity
validates_numericality_of :quantity
after_save :update_article_quantity
after_destroy :update_article_quantity
protected
def update_article_quantity
stock_article.update_quantity!
end
end