198 lines
8.2 KiB
Ruby
198 lines
8.2 KiB
Ruby
# A GroupOrderArticle stores the sum of how many items of an OrderArticle are ordered as part of a GroupOrder.
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# The chronologically order of the Ordergroup - activity are stored in GroupOrderArticleQuantity
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#
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class GroupOrderArticle < ActiveRecord::Base
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belongs_to :group_order
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belongs_to :order_article
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has_many :group_order_article_quantities, :dependent => :destroy
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validates_presence_of :group_order, :order_article
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validates_uniqueness_of :order_article_id, :scope => :group_order_id # just once an article per group order
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scope :ordered, -> { includes(:group_order => :ordergroup).order('groups.name') }
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localize_input_of :result
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# Setter used in group_order_article#new
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# We have to create an group_order, if the ordergroup wasn't involved in the order yet
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def ordergroup_id=(id)
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self.group_order = GroupOrder.where(order_id: order_article.order_id, ordergroup_id: id).first_or_initialize
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end
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def ordergroup_id
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group_order.try!(:ordergroup_id)
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end
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# Updates the quantity/tolerance for this GroupOrderArticle by updating both GroupOrderArticle properties
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# and the associated GroupOrderArticleQuantities chronologically.
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#
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# See description of the ordering algorithm in the general application documentation for details.
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def update_quantities(quantity, tolerance)
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logger.debug("GroupOrderArticle[#{id}].update_quantities(#{quantity}, #{tolerance})")
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logger.debug("Current quantity = #{self.quantity}, tolerance = #{self.tolerance}")
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# When quantity and tolerance are zero, we don't serve any purpose
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if quantity == 0 && tolerance == 0
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logger.debug("Self-destructing since requested quantity and tolerance are zero")
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destroy!
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return
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end
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# Get quantities ordered with the newest item first.
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quantities = group_order_article_quantities.order('created_on DESC').to_a
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logger.debug("GroupOrderArticleQuantity items found: #{quantities.size}")
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if (quantities.size == 0)
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# There is no GroupOrderArticleQuantity item yet, just insert with desired quantities...
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logger.debug("No quantities entry at all, inserting a new one with the desired quantities")
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quantities.push(GroupOrderArticleQuantity.new(:group_order_article => self, :quantity => quantity, :tolerance => tolerance))
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self.quantity, self.tolerance = quantity, tolerance
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else
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# Decrease quantity/tolerance if necessary by going through the existing items and decreasing their values...
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i = 0
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while (i < quantities.size && (quantity < self.quantity || tolerance < self.tolerance))
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logger.debug("Need to decrease quantities for GroupOrderArticleQuantity[#{quantities[i].id}]")
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if (quantity < self.quantity && quantities[i].quantity > 0)
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delta = self.quantity - quantity
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delta = (delta > quantities[i].quantity ? quantities[i].quantity : delta)
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logger.debug("Decreasing quantity by #{delta}")
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quantities[i].quantity -= delta
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self.quantity -= delta
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end
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if (tolerance < self.tolerance && quantities[i].tolerance > 0)
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delta = self.tolerance - tolerance
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delta = (delta > quantities[i].tolerance ? quantities[i].tolerance : delta)
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logger.debug("Decreasing tolerance by #{delta}")
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quantities[i].tolerance -= delta
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self.tolerance -= delta
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end
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i += 1
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end
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# If there is at least one increased value: insert a new GroupOrderArticleQuantity object
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if (quantity > self.quantity || tolerance > self.tolerance)
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logger.debug("Inserting a new GroupOrderArticleQuantity")
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quantities.insert(0, GroupOrderArticleQuantity.new(
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:group_order_article => self,
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:quantity => (quantity > self.quantity ? quantity - self.quantity : 0),
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:tolerance => (tolerance > self.tolerance ? tolerance - self.tolerance : 0)
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))
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# Recalc totals:
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self.quantity += quantities[0].quantity
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self.tolerance += quantities[0].tolerance
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end
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end
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# Check if something went terribly wrong and quantites have not been adjusted as desired.
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if (self.quantity != quantity || self.tolerance != tolerance)
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raise 'Invalid state: unable to update GroupOrderArticle/-Quantities to desired quantities!'
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end
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# Remove zero-only items.
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quantities = quantities.reject { | q | q.quantity == 0 && q.tolerance == 0}
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# Save
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transaction do
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quantities.each { | i | i.save! }
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self.group_order_article_quantities = quantities
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save!
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end
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end
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# Determines how many items of this article the Ordergroup receives.
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# Returns a hash with three keys: :quantity / :tolerance / :total
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#
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# See description of the ordering algorithm in the general application documentation for details.
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def calculate_result(total = nil)
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# return memoized result unless a total is given
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return @calculate_result if total.nil? && !@calculate_result.nil?
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quantity = tolerance = total_quantity = 0
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# Get total
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if not total.nil?
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logger.debug "<#{order_article.article.name}> => #{total} (given)"
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elsif order_article.article.is_a?(StockArticle)
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total = order_article.article.quantity
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logger.debug "<#{order_article.article.name}> (stock) => #{total}"
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else
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total = order_article.units_to_order * order_article.price.unit_quantity
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logger.debug "<#{order_article.article.name}> units_to_order #{order_article.units_to_order} => #{total}"
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end
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if total > 0
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# In total there are enough units ordered. Now check the individual result for the ordergroup (group_order).
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#
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# Get all GroupOrderArticleQuantities for this OrderArticle...
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order_quantities = GroupOrderArticleQuantity.where(group_order_article_id: order_article.group_order_article_ids).order('created_on')
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logger.debug "GroupOrderArticleQuantity records found: #{order_quantities.size}"
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# Determine quantities to be ordered...
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order_quantities.each do |goaq|
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q = [goaq.quantity, total - total_quantity].min
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total_quantity += q
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if goaq.group_order_article_id == self.id
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logger.debug "increasing quantity by #{q}"
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quantity += q
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end
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break if total_quantity >= total
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end
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# Determine tolerance to be ordered...
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if total_quantity < total
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logger.debug "determining additional items to be ordered from tolerance"
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order_quantities.each do |goaq|
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q = [goaq.tolerance, total - total_quantity].min
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total_quantity += q
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if goaq.group_order_article_id == self.id
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logger.debug "increasing tolerance by #{q}"
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tolerance += q
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end
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break if total_quantity >= total
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end
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end
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logger.debug "determined quantity/tolerance/total: #{quantity} / #{tolerance} / #{quantity + tolerance}"
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end
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# memoize result unless a total is given
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r = {:quantity => quantity, :tolerance => tolerance, :total => quantity + tolerance}
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@calculate_result = r if total.nil?
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r
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end
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# Returns order result,
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# either calcualted on the fly or fetched from result attribute
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# Result is set when finishing the order.
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def result(type = :total)
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self[:result] || calculate_result[type]
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end
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# This is used for automatic distribution, e.g., in order.finish! or when receiving orders
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def save_results!(article_total = nil)
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new_result = calculate_result(article_total)[:total]
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self.update_attribute(:result_computed, new_result)
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self.update_attribute(:result, new_result)
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end
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# Returns total price for this individual article
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# Until the order is finished this will be the maximum price or
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# the minimum price depending on configuration. When the order is finished it
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# will be the value depending of the article results.
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def total_price(order_article = self.order_article)
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if order_article.order.open?
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if FoodsoftConfig[:tolerance_is_costly]
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order_article.article.fc_price * (quantity + tolerance)
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else
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order_article.article.fc_price * quantity
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end
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else
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order_article.price.fc_price * result
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end
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end
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# Check if the result deviates from the result_computed
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def result_manually_changed?
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result != result_computed unless result.nil?
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end
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end
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