Module: Amountable

Extended by:
ActiveSupport::Autoload
Defined in:
lib/amountable.rb,
lib/amountable/version.rb

Overview

Copyright 2015, Instacart

Defined Under Namespace

Modules: ClassMethods Classes: InvalidAmountName

Constant Summary collapse

VERSION = 
'0.0.7'

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/amountable.rb', line 10

def self.included(base)

  base.extend Amountable::ClassMethods

  base.class_eval do
    has_many :amounts, as: :amountable, dependent: :destroy, autosave: false
    validate :validate_amount_names
    class_attribute :amount_names
    class_attribute :amount_sets
    self.amount_sets = Hash.new { |h, k| h[k] = Set.new }
    self.amount_names = Set.new

    def all_amounts
      @all_amounts ||= amounts.to_set
    end

    def find_amount(name)
      (@amounts_by_name ||= {})[name.to_sym] ||= all_amounts.find { |am| am.name == name.to_s }
    end

    def find_amounts(names)
      all_amounts.select { |am| names.include?(am.name.to_sym) }
    end

    def validate_amount_names
      amounts.each do |amount|
        errors.add(:amounts, "#{amount.name} is not an allowed amount name.") unless self.class.allowed_amount_name?(amount.name)
      end
    end

    def serializable_hash(opts = nil)
      opts ||= {}
      super(opts).tap do |base|
        unless opts[:except].to_a.include?(:amounts)
          amounts_json = (self.class.amount_names + self.class.amount_sets.keys).inject({}) do |mem, name|
            mem.merge!(name.to_s => send(name).to_f) unless opts[:except].to_a.include?(name.to_sym)
            mem
          end
          base.merge!(amounts_json)
        end
      end
    end

    def save(args = {})
      ActiveRecord::Base.transaction do
        save_amounts if super(args)
      end
    end

    def save!(args = {})
      ActiveRecord::Base.transaction do
        save_amounts! if super(args)
      end
    end

    def save_amounts(bang: false)
      amounts_to_insert = []
      amounts.each do |amount|
        if amount.new_record?
          amount.amountable_id = self.id
          amounts_to_insert << amount
        else
          bang ? amount.save! : amount.save
        end
      end
      Amount.import(amounts_to_insert, timestamps: true, validate: false)
      amounts_to_insert.each do |amount|
        amount.instance_variable_set(:@new_record, false)
      end
      true
    end

    def save_amounts!; save_amounts(bang: true); end

  end
end