foodsoft/app/models/order_article.rb

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# An OrderArticle represents a single Article that is part of an Order.
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class OrderArticle < ActiveRecord::Base
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belongs_to :order
belongs_to :article
belongs_to :article_price
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has_many :group_order_articles, :dependent => :destroy
validates_presence_of :order_id, :article_id
validate :article_and_price_exist
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scope :ordered, :conditions => "units_to_order >= 1"
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# This method returns either the ArticlePrice or the Article
# The first will be set, when the the order is finished
def price
article_price || article
end
# Count quantities of belonging group_orders.
# In balancing this can differ from ordered (by supplier) quantity for this article.
def group_orders_sum
quantity = group_order_articles.collect(&:result).sum
{:quantity => quantity, :price => quantity * price.fc_price}
end
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# Update quantity/tolerance/units_to_order from group_order_articles
def update_results!
if order.open?
quantity = group_order_articles.collect(&:quantity).sum
tolerance = group_order_articles.collect(&:tolerance).sum
update_attributes(:quantity => quantity, :tolerance => tolerance,
:units_to_order => calculate_units_to_order(quantity, tolerance))
elsif order.finished?
update_attribute(:units_to_order, group_order_articles.collect(&:result).sum)
end
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end
# Returns how many units of the belonging article need to be ordered given the specified order quantity and tolerance.
# This is determined by calculating how many units can be ordered from the given order quantity, using
# the tolerance to order an additional unit if the order quantity is not quiet sufficient.
# There must always be at least one item in a unit that is an ordered quantity (no units are ever entirely
# filled by tolerance items only).
#
# Example:
#
# unit_quantity | quantity | tolerance | calculate_units_to_order
# --------------+----------+-----------+-----------------------
# 4 | 0 | 2 | 0
# 4 | 0 | 5 | 0
# 4 | 2 | 2 | 1
# 4 | 4 | 2 | 1
# 4 | 4 | 4 | 1
# 4 | 5 | 3 | 2
# 4 | 5 | 4 | 2
#
def calculate_units_to_order(quantity, tolerance = 0)
unit_size = price.unit_quantity
units = quantity / unit_size
remainder = quantity % unit_size
units += ((remainder > 0) && (remainder + tolerance >= unit_size) ? 1 : 0)
end
# Calculate price for ordered quantity.
def total_price
units_to_order * price.unit_quantity * price.price
end
# Calculate gross price for ordered qunatity.
def total_gross_price
units_to_order * price.unit_quantity * price.gross_price
end
def ordered_quantities_equal_to_group_orders?
(units_to_order * price.unit_quantity) == group_orders_sum[:quantity]
end
# Updates order_article and belongings during balancing process
def update_article_and_price!(article_attributes, price_attributes, order_article_attributes)
OrderArticle.transaction do
# Updates article
article.update_attributes!(article_attributes)
article_price.attributes = price_attributes
if article_price.changed?
# Creates a new article_price if neccessary
price = build_article_price(price_attributes)
price.created_at = order.ends
price.save!
# Updates ordergroup values
group_order_articles.each { |goa| goa.group_order.update_price! }
end
# Updates units_to_order
self.attributes = order_article_attributes
self.save!
end
end
# Units missing for the next full unit_quantity of the article
def missing_units
units = article.unit_quantity - ((quantity % article.unit_quantity) + tolerance)
units = 0 if units < 0
units
end
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private
def article_and_price_exist
errors.add(:article, "muss angegeben sein und einen aktuellen Preis haben") if !(article = Article.find(article_id)) || article.fc_price.nil?
end
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end
# == Schema Information
#
# Table name: order_articles
#
# id :integer(4) not null, primary key
# order_id :integer(4) default(0), not null
# article_id :integer(4) default(0), not null
# quantity :integer(4) default(0), not null
# tolerance :integer(4) default(0), not null
# units_to_order :integer(4) default(0), not null
# lock_version :integer(4) default(0), not null
# article_price_id :integer(4)
#