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module Spree
class Calculator < Spree::Base
acts_as_paranoid
belongs_to :calculable, polymorphic: true, optional: true, inverse_of: :calculator
# This method calls a compute_<computable> method. must be overridden in concrete calculator.
#
# It should return amount computed based on #calculable and the computable parameter
def compute(computable)
# Spree::LineItem -> :compute_line_item
computable_name = computable.class.name.demodulize.underscore
method = "compute_#{computable_name}".to_sym
calculator_class = self.class
if respond_to?(method)
send(method, computable)
else
raise NotImplementedError, "Please implement '#{method}(#{computable_name})' in your calculator: #{calculator_class.name}"
end
end
# overwrite to provide description for your calculators
def self.description
'Base Calculator'
end
# Returns all calculators applicable for kind of work
def self.calculators
Rails.application.config.spree.calculators
end
def to_s
self.class.name.titleize.gsub("Calculator\/", '')
end
def description
self.class.description
end
def available?(_object)
true
end
end
end
Version data entries
25 entries across 25 versions & 1 rubygems