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Contents
module Spree
module PromotionHandler
# Decides which promotion should be activated given the current order context
#
# By activated it doesn't necessarily mean that the order will have a
# discount for every activated promotion. It means that the discount will be
# created and might eventually become eligible. The intention here is to
# reduce overhead. e.g. a promotion that requires item A to be eligible
# shouldn't be eligible unless item A is added to the order.
#
# It can be used as a wrapper for custom handlers as well. Different
# applications might have completely different requirements to make
# the promotions system accurate and performant. Here they can plug custom
# handler to activate promos as they wish once an item is added to cart
class Cart
attr_reader :line_item, :order
attr_accessor :error, :success
def initialize(order, line_item=nil)
@order, @line_item = order, line_item
end
def activate
promotions.each do |promotion|
if (line_item && promotion.eligible?(line_item)) || promotion.eligible?(order)
promotion.activate(line_item: line_item, order: order)
end
end
end
private
def promotions
# AR cannot bind raw ASTs to prepared statements. There always must be a manager around.
# Also Postgresql requires an aliased table for `SELECT * FROM (subexpression) AS alias`.
# And Sqlite3 cannot work on outher parenthesis from `(left UNION right)`.
# So this construct makes both happy.
select = Arel::SelectManager.new(
Promotion,
Promotion.arel_table.create_table_alias(
order.promotions.active.union(Promotion.active.where(code: nil, path: nil)),
Promotion.table_name
),
)
select.project(Arel.star)
Promotion.find_by_sql(
select,
order.promotions.bind_values
)
end
end
end
end
Version data entries
35 entries across 35 versions & 1 rubygems