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