Module: Amountable

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

Overview

Copyright 2015-2016, Instacart

Defined Under Namespace

Modules: ClassMethods, JsonbMethods, TableMethods Classes: InvalidAmountName, MissingColumn

Constant Summary collapse

ALLOWED_STORAGE = 
i(table json).freeze
VERSION = 
'0.1.0'

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/amountable.rb', line 15

def self.included(base)

  base.extend Amountable::ClassMethods

  base.class_eval do
    validate :validate_amount_names
    class_attribute :amount_names
    class_attribute :amount_sets
    class_attribute :amounts_column_name
    self.amount_sets = Hash.new { |h, k| h[k] = Set.new }
    self.amount_names = Set.new
    self.amounts_column_name = 'amounts'

    def all_amounts
      @all_amounts ||= amounts.to_set
    end

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

    def find_amounts(names)
      amounts.to_set.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
  end
end