foodsoft/app/models/stock_change.rb

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class StockChange < ApplicationRecord
belongs_to :delivery, optional: true, foreign_key: 'stock_event_id'
belongs_to :order, optional: true
belongs_to :stock_taking, optional: true, foreign_key: 'stock_event_id'
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