foodsoft/app/models/stock_taking.rb

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class StockTaking < ActiveRecord::Base
has_many :stock_changes, :dependent => :destroy
has_many :stock_articles, :through => :stock_changes
validates_presence_of :date
def stock_change_attributes=(stock_change_attributes)
for attributes in stock_change_attributes
stock_changes.build(attributes) unless attributes[:quantity].to_i == 0
end
end
end