168 lines
7.3 KiB
Ruby
168 lines
7.3 KiB
Ruby
# == Schema Information
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# Schema version: 20090120184410
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#
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# Table name: group_order_articles
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#
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# id :integer not null, primary key
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# group_order_id :integer default(0), not null
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# order_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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# updated_on :datetime not null
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# quantity_result :integer
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# tolerance_result :integer
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#
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# 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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extend ActiveSupport::Memoizable # Ability to cache method results. Use memoize :expensive_method
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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_id, :order_article_id
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validates_inclusion_of :quantity, :in => 0..99
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validates_inclusion_of :tolerance, :in => 0..99
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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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attr_accessor :ordergroup_id # To create an new GroupOrder if neccessary
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named_scope :ordered, :conditions => 'result > 0'
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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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# Get quantities ordered with the newest item first.
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quantities = group_order_article_quantities.find(:all, :order => 'created_on desc')
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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
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quantity = tolerance = 0
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# Get total
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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}>.unitsToOrder => items ordered: #{order_article.units_to_order} => #{total}")
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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.all(
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:conditions => ["group_order_article_id IN (?)", 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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total_quantity = i = 0
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while (i < order_quantities.size && total_quantity < total)
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q = (order_quantities[i].quantity <= total - total_quantity ? order_quantities[i].quantity : total - total_quantity)
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total_quantity += q
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if (order_quantities[i].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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i += 1
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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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i = 0
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while (i < order_quantities.size && total_quantity < total)
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q = (order_quantities[i].tolerance <= total - total_quantity ? order_quantities[i].tolerance : total - total_quantity)
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total_quantity += q
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if (order_quantities[i].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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i += 1
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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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{:quantity => quantity, :tolerance => tolerance, :total => quantity + tolerance}
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end
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memoize :calculate_result
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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 during order.finish!.
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def save_results!
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self.update_attribute(:result, calculate_result[:total])
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end
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end
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