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
attr_reader :update_current_price
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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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validates_uniqueness_of :article_id, scope: :order_id
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scope :ordered, :conditions => "units_to_order >= 1"
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before_create :init_from_balancing
after_destroy :update_ordergroup_prices
def self.sort_by_name(order_articles)
order_articles.sort { |a,b| a.article.name <=> b.article.name }
end
def self.sort_by_order_number(order_articles)
order_articles.sort do |a,b|
a.article.order_number.to_s.gsub(/[^[:digit:]]/, "").to_i <=>
b.article.order_number.to_s.gsub(/[^[:digit:]]/, "").to_i
end
end
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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 self
self.update_attributes!(order_article_attributes)
# Updates article
article.update_attributes!(article_attributes)
# Updates article_price belonging to current order article
article_price.attributes = price_attributes
if article_price.changed?
# Updates also price attributes of article if update_current_price is selected
if update_current_price
article.update_attributes!(price_attributes)
self.article_price = article.article_prices.first # Assign new created article price to order article
else
# Creates a new article_price if neccessary
# Set created_at timestamp to order ends, to make sure the current article price isn't changed
create_article_price!(price_attributes.merge(created_at: order.ends)) and save
end
# Updates ordergroup values
update_ordergroup_prices
end
end
end
def update_current_price=(value)
@update_current_price = (value == true or value == '1') ? true : false
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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# Associate with current article price if created in a finished order
def init_from_balancing
if order.present? and order.finished?
self.article_price = article.article_prices.first
self.units_to_order = 1
end
end
def update_ordergroup_prices
group_order_articles.each { |goa| goa.group_order.update_price! }
end
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end