Contents

require 'rules/has_rules'
require 'rules/parameters/attribute'

module Rules
  class RuleSet < ActiveRecord::Base
    attr_accessible :rules, :evaluation_logic, :rules_attributes

    belongs_to :source, polymorphic: true

    has_many :rules, class_name: 'Rules::Rule'

    accepts_nested_attributes_for :rules, allow_destroy: true

    validates :evaluation_logic, inclusion: {in: %w(all any)}, allow_nil: true

    def self.set_attributes_for(klass, klass_attributes)
      @attributes ||= {}
      @attributes[klass] = attributize(klass_attributes)
    end

    def self.attributes
      @attributes || {}
    end

    def self.attributize(attributes_hash)
      mapped_hash = {}
      attributes_hash.each do |k, v|
        mapped_hash[k] = Rules::Parameters::Attribute.new(v.merge(key: k))
      end
      mapped_hash
    end

    def attributes
      return {} unless source
      self.class.attributes[source.class] || {}
    end

    # TODO: Arbitrary rule set logic (Treetop)
    def evaluate(attributes = {})
      if evaluation_logic == 'any'
        !!rules.detect { |rule| rule.evaluate(attributes) }
      else
        rules.each do |rule|
          return false unless rule.evaluate(attributes)
        end
        true
      end
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
rules-0.0.1	lib/rules/rule_set.rb