222 lines
8.5 KiB
Ruby
222 lines
8.5 KiB
Ruby
# An OrderArticle represents a single Article that is part of an Order.
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class OrderArticle < ActiveRecord::Base
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attr_reader :update_global_price
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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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validates_uniqueness_of :article_id, scope: :order_id
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_ordered_sql = "units_to_order > 0 OR units_billed > 0 OR units_received > 0"
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scope :ordered, -> { where(_ordered_sql) }
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scope :ordered_or_member, -> { includes(:group_order_articles).where("#{_ordered_sql} OR group_order_articles.result > 0") }
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before_create :init_from_balancing
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after_destroy :update_ordergroup_prices
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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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# latest information on available units
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def units
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return units_received unless units_received.nil?
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return units_billed unless units_billed.nil?
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units_to_order
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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 * 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 * price.unit_quantity * price.gross_price
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end
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def ordered_quantities_different_from_group_orders?(ordered_mark="!", billed_mark="?", received_mark="?")
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if not units_received.nil?
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((units_received * price.unit_quantity) == group_orders_sum[:quantity]) ? false : received_mark
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elsif not units_billed.nil?
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((units_billed * price.unit_quantity) == group_orders_sum[:quantity]) ? false : billed_mark
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elsif not units_to_order.nil?
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((units_to_order * price.unit_quantity) == group_orders_sum[:quantity]) ? false : ordered_mark
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else
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nil # can happen in integration tests
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end
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end
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# redistribute articles over ordergroups
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# quantity Number of units to distribute
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# surplus What to do when there are more articles than ordered quantity
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# :tolerance fill member orders' tolerance
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# :stock move to stock
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# nil nothing; for catching the remaining count
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# update_totals Whether to update group_order and ordergroup totals
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# returns array with counts for each surplus method
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def redistribute(quantity, surplus = [:tolerance], update_totals = true)
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qty_left = quantity
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counts = [0] * surplus.length
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if surplus.index(:tolerance).nil?
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qty_for_members = [qty_left, self.quantity].min
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else
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qty_for_members = [qty_left, self.quantity+self.tolerance].min
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counts[surplus.index(:tolerance)] = [0, qty_for_members-self.quantity].max
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end
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# Recompute
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group_order_articles.each {|goa| goa.save_results! qty_for_members }
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qty_left -= qty_for_members
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# if there's anything left, move to stock if wanted
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if qty_left > 0 and surplus.index(:stock)
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counts[surplus.index(:stock)] = qty_left
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# 1) find existing stock article with same name, unit, price
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# 2) if not found, create new stock article
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# avoiding duplicate stock article names
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end
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if qty_left > 0 and surplus.index(nil)
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counts[surplus.index(nil)] = qty_left
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end
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# Update GroupOrder prices & Ordergroup stats
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# TODO only affected group_orders, and once after redistributing all articles
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if update_totals
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update_ordergroup_prices
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order.ordergroups.each(&:update_stats!)
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end
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# TODO notifications
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counts
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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!(order_article_attributes, article_attributes, price_attributes = nil)
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OrderArticle.transaction do
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# Updates self
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self.update_attributes!(order_article_attributes)
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# Updates article
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article.update_attributes!(article_attributes)
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# Updates article_price belonging to current order article
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if price_attributes.present?
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article_price.attributes = price_attributes
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if article_price.changed?
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# Updates also price attributes of article if update_global_price is selected
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if update_global_price
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article.update_attributes!(price_attributes)
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self.article_price = article.article_prices.first and save # Assign new created article price to order article
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else
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# Creates a new article_price if neccessary
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# Set created_at timestamp to order ends, to make sure the current article price isn't changed
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create_article_price!(price_attributes.merge(created_at: order.ends)) and save
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# TODO: The price_attributes do not include an article_id so that
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# the entry in the database will not "know" which article is
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# referenced. Let us check the effect of that and change it or
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# comment on the meaning.
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# Possibly this is the real reason why the global price is not
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# affected instead of the `created_at: order.ends` injection.
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end
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# Updates ordergroup values
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update_ordergroup_prices
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end
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end
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end
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end
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def update_global_price=(value)
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@update_global_price = (value == true or value == '1') ? true : false
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end
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# Units missing for the next full unit_quantity of the article
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def missing_units
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units = article.unit_quantity - ((quantity % article.unit_quantity) + tolerance)
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units = 0 if units < 0
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units
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end
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# Check if the result of any associated GroupOrderArticle was overridden manually
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def result_manually_changed?
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group_order_articles.any? {|goa| goa.result_manually_changed?}
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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, I18n.t('model.order_article.error_price')) if !(article = Article.find(article_id)) || article.fc_price.nil?
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rescue
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errors.add(:article, I18n.t('model.order_article.error_price'))
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end
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# Associate with current article price if created in a finished order
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def init_from_balancing
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if order.present? and order.finished?
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self.article_price = article.article_prices.first
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end
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end
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def update_ordergroup_prices
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# updates prices of ALL ordergroups - these are actually too many
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# in case of performance issues, update only ordergroups, which ordered this article
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# CAUTION: in after_destroy callback related records (e.g. group_order_articles) are already non-existent
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order.group_orders.each(&:update_price!)
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end
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end
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