Class: Money

Inherits:
Object
  • Object
show all
Extended by:
Constructors
Includes:
Comparable, Arithmetic, Formatting
Defined in:
lib/money/money.rb,
lib/money/version.rb,
lib/money/currency.rb,
lib/money/bank/base.rb,
lib/money/currency/loader.rb,
lib/money/money/arithmetic.rb,
lib/money/money/formatting.rb,
lib/money/money/constructors.rb,
lib/money/rates_store/memory.rb,
lib/money/currency/heuristics.rb,
lib/money/bank/single_currency.rb,
lib/money/bank/variable_exchange.rb

Overview

“Money is any object or record that is generally accepted as payment for goods and services and repayment of debts in a given socio-economic context or country.” -Wikipedia

An instance of Money represents an amount of a specific currency.

Money is a value object and should be treated as immutable.

Defined Under Namespace

Modules: Arithmetic, Bank, Constructors, Formatting, RatesStore Classes: Currency, UndefinedSmallestDenomination

Constant Summary

VERSION =
"6.7.1"

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Constructors

ca_dollar, empty, euro, pound_sterling, us_dollar

Methods included from Formatting

#decimal_mark, #format, #thousands_separator

Methods included from Arithmetic

#%, #*, #+, #-, #-@, #/, #<=>, #==, #abs, #coerce, #div, #divmod, #eql?, #modulo, #negative?, #nonzero?, #positive?, #remainder, #zero?

Constructor Details

#initialize(obj, currency = Money.default_currency, bank = Money.default_bank) ⇒ Money

Creates a new Money object of value given in the fractional unit of the given currency.

Alternatively you can use the convenience methods like Money::Constructors#ca_dollar and Money::Constructors#us_dollar.

Examples:

Money.new(100)        #=> #<Money @fractional=100 @currency="USD">
Money.new(100, "USD") #=> #<Money @fractional=100 @currency="USD">
Money.new(100, "EUR") #=> #<Money @fractional=100 @currency="EUR">

Parameters:

  • obj (Object)

    Either the fractional value of the money, a Money object, or a currency. (If passed a currency as the first argument, a Money will be created in that currency with fractional value

    0.

  • currency (Currency, String, Symbol) (defaults to: Money.default_currency)

    The currency format.

  • bank (Money::Bank::*) (defaults to: Money.default_bank)

    The exchange bank to use.



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# File 'lib/money/money.rb', line 258

def initialize(obj, currency = Money.default_currency, bank = Money.default_bank)
  @fractional = obj.respond_to?(:fractional) ? obj.fractional : as_d(obj)
  @currency   = obj.respond_to?(:currency) ? obj.currency : Currency.wrap(currency)
  @currency ||= Money.default_currency
  @bank       = obj.respond_to?(:bank) ? obj.bank : bank
end

Class Attribute Details

.conversion_precisionFixnum

Returns Use this to specify precision for converting Rational to BigDecimal

Returns:

  • (Fixnum)

    Use this to specify precision for converting Rational to BigDecimal



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# File 'lib/money/money.rb', line 122

attr_accessor :default_bank, :default_formatting_rules,
:use_i18n, :infinite_precision, :conversion_precision

.default_bankMoney::Bank::Base

Returns Each Money object is associated to a bank object, which is responsible for currency exchange. This property allows you to specify the default bank object. The default value for this property is an instance of Bank::VariableExchange. It allows one to specify custom exchange rates.

Returns:

  • (Money::Bank::Base)

    Each Money object is associated to a bank object, which is responsible for currency exchange. This property allows you to specify the default bank object. The default value for this property is an instance of Bank::VariableExchange. It allows one to specify custom exchange rates.



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# File 'lib/money/money.rb', line 122

def default_bank
  @default_bank
end

.default_currencyMoney::Currency

Returns The default currency, which is used when Money.new is called without an explicit currency argument. The default value is Currency.new(“USD”). The value must be a valid Money::Currency instance.

Returns:

  • (Money::Currency)

    The default currency, which is used when Money.new is called without an explicit currency argument. The default value is Currency.new(“USD”). The value must be a valid Money::Currency instance.



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# File 'lib/money/money.rb', line 132

attr_writer :rounding_mode, :default_currency

.default_formatting_rulesHash

Returns Use this to define a default hash of rules for every time Money#format is called. Rules provided on method call will be merged with the default ones. To overwrite a rule, just provide the intended value while calling format.

Examples:

Money.default_formatting_rules = { :display_free => true }
Money.new(0, "USD").format                          # => "free"
Money.new(0, "USD").format(:display_free => false)  # => "$0.00"

Returns:

  • (Hash)

    Use this to define a default hash of rules for every time Money#format is called. Rules provided on method call will be merged with the default ones. To overwrite a rule, just provide the intended value while calling format.

See Also:

  • for more details.


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# File 'lib/money/money.rb', line 122

attr_accessor :default_bank, :default_formatting_rules,
:use_i18n, :infinite_precision, :conversion_precision

.infinite_precisionBoolean

Returns Use this to enable infinite precision cents

Returns:

  • (Boolean)

    Use this to enable infinite precision cents



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# File 'lib/money/money.rb', line 122

attr_accessor :default_bank, :default_formatting_rules,
:use_i18n, :infinite_precision, :conversion_precision

.rounding_mode(mode = nil) ⇒ BigDecimal::ROUND_MODE, Yield

Use this to return the rounding mode. You may also pass a rounding mode and a block to temporarily change it. It will then return the results of the block instead.

Examples:

fee = Money.rounding_mode(BigDecimal::ROUND_HALF_UP) do
  Money.new(1200) * BigDecimal.new('0.029')
end

Parameters:

  • mode (BigDecimal::ROUND_MODE) (defaults to: nil)

Returns:

  • (BigDecimal::ROUND_MODE, Yield)

    rounding mode or block results



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# File 'lib/money/money.rb', line 182

def self.rounding_mode(mode=nil)
  if mode.nil?
    Thread.current[:money_rounding_mode] || @rounding_mode
  else
    begin
      Thread.current[:money_rounding_mode] = mode
      yield
    ensure
      Thread.current[:money_rounding_mode] = nil
    end
  end
end

.use_i18nBoolean

Returns Use this to disable i18n even if it's used by other objects in your app.

Returns:

  • (Boolean)

    Use this to disable i18n even if it's used by other objects in your app.



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# File 'lib/money/money.rb', line 122

attr_accessor :default_bank, :default_formatting_rules,
:use_i18n, :infinite_precision, :conversion_precision

Instance Attribute Details

#bankObject (readonly)

Returns the value of attribute bank



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# File 'lib/money/money.rb', line 87

attr_reader :currency, :bank

#currencyCurrency (readonly)

Returns The money's currency.

Returns:



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# File 'lib/money/money.rb', line 87

def currency
  @currency
end

Class Method Details

.add_rate(from_currency, to_currency, rate) ⇒ Numeric

Adds a new exchange rate to the default bank and return the rate.

Examples:

Money.add_rate("USD", "CAD", 1.25) #=> 1.25

Parameters:

  • from_currency (Currency, String, Symbol)

    Currency to exchange from.

  • to_currency (Currency, String, Symbol)

    Currency to exchange to.

  • rate (Numeric)

    Rate to exchange with.

Returns:

  • (Numeric)


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# File 'lib/money/money.rb', line 206

def self.add_rate(from_currency, to_currency, rate)
  Money.default_bank.add_rate(from_currency, to_currency, rate)
end

.disallow_currency_conversion!Object

Sets the default bank to be a SingleCurrency bank that raises on currency exchange. Useful when apps operate in a single currency at a time.



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# File 'lib/money/money.rb', line 212

def self.disallow_currency_conversion!
  self.default_bank = Bank::SingleCurrency.instance
end

.from_amount(amount, currency = default_currency, bank = default_bank) ⇒ Money

Creates a new Money object of value given in the unit of the given currency.

Examples:

Money.from_amount(23.45, "USD") # => #<Money fractional:2345 currency:USD>
Money.from_amount(23.45, "JPY") # => #<Money fractional:23 currency:JPY>

Parameters:

  • amount (Numeric)

    The numerical value of the money.

  • currency (Currency, String, Symbol) (defaults to: default_currency)

    The currency format.

  • bank (Money::Bank::*) (defaults to: default_bank)

    The exchange bank to use.

Returns:

See Also:



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# File 'lib/money/money.rb', line 230

def self.from_amount(amount, currency = default_currency, bank = default_bank)
  Numeric === amount or raise ArgumentError, "'amount' must be numeric"
  currency = Currency.wrap(currency)
  value = amount.to_d * currency.subunit_to_unit
  value = value.round(0, rounding_mode) unless infinite_precision
  new(value, currency, bank)
end

.inherited(base) ⇒ Object



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# File 'lib/money/money.rb', line 164

def self.inherited(base)
  base.setup_defaults
end

.setup_defaultsObject



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# File 'lib/money/money.rb', line 144

def self.setup_defaults
  # Set the default bank for creating new +Money+ objects.
  self.default_bank = Bank::VariableExchange.instance

  # Set the default currency for creating new +Money+ object.
  self.default_currency = Currency.new("USD")

  # Default to using i18n
  self.use_i18n = true

  # Default to not using infinite precision cents
  self.infinite_precision = false

  # Default to bankers rounding
  self.rounding_mode = BigDecimal::ROUND_HALF_EVEN

  # Default the conversion of Rationals precision to 16
  self.conversion_precision = 16
end

Instance Method Details

#allocate(splits) ⇒ Array<Money>

Allocates money between different parties without losing pennies. After the mathematical split has been performed, leftover pennies will be distributed round-robin amongst the parties. This means that parties listed first will likely receive more pennies than ones that are listed later

Examples:

Money.new(5,   "USD").allocate([0.3, 0.7])         #=> [Money.new(2), Money.new(3)]
Money.new(100, "USD").allocate([0.33, 0.33, 0.33]) #=> [Money.new(34), Money.new(33), Money.new(33)]

Parameters:

  • splits (Array<Numeric>)
    0.50, 0.25, 0.25

    to give 50% of the cash to party1, 25% to party2, and 25% to party3.

Returns:



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# File 'lib/money/money.rb', line 489

def allocate(splits)
  allocations = allocations_from_splits(splits)

  if (allocations - BigDecimal("1")) > Float::EPSILON
    raise ArgumentError, "splits add to more then 100%"
  end

  amounts, left_over = amounts_from_splits(allocations, splits)

  unless self.class.infinite_precision
    delta = left_over > 0 ? 1 : -1
    # Distribute left over pennies amongst allocations
    left_over.to_i.abs.times { |i| amounts[i % amounts.length] += delta }
  end

  amounts.collect { |fractional| self.class.new(fractional, currency) }
end

#amountBigDecimal

Returns the numerical value of the money

Examples:

Money.new(1_00, "USD").amount    # => BigDecimal.new("1.00")

Returns:

  • (BigDecimal)

See Also:



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# File 'lib/money/money.rb', line 294

def amount
  to_d
end

#as_ca_dollarMoney

Receive a money object with the same amount as the current Money object in Canadian dollar.

Examples:

n = Money.new(100, "USD").as_ca_dollar
n.currency #=> #<Money::Currency id: cad>

Returns:



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# File 'lib/money/money.rb', line 460

def as_ca_dollar
  exchange_to("CAD")
end

#as_euroMoney

Receive a money object with the same amount as the current Money object in euro.

Examples:

n = Money.new(100, "USD").as_euro
n.currency #=> #<Money::Currency id: eur>

Returns:



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# File 'lib/money/money.rb', line 472

def as_euro
  exchange_to("EUR")
end

#as_us_dollarMoney

Receive a money object with the same amount as the current Money object in United States dollar.

Examples:

n = Money.new(100, "CAD").as_us_dollar
n.currency #=> #<Money::Currency id: usd>

Returns:



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# File 'lib/money/money.rb', line 448

def as_us_dollar
  exchange_to("USD")
end

#centsInteger, BigDecimal

Convenience method for fractional part of the amount. Synonym of #fractional

Returns:

  • (Integer)

    when infinite_precision is false

  • (BigDecimal)

    when infinite_precision is true

See Also:



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# File 'lib/money/money.rb', line 32

def cents
  fractional
end

#currency_as_stringString

Return string representation of currency object

Examples:

Money.new(100, :USD).currency_as_string #=> "USD"

Returns:



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# File 'lib/money/money.rb', line 304

def currency_as_string
  currency.to_s
end

#currency_as_string=(val) ⇒ Money::Currency

Set currency object using a string

Examples:

Money.new(100).currency_as_string("CAD") #=> #<Money::Currency id: cad>

Parameters:

  • val (String)

    The currency string.

Returns:



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# File 'lib/money/money.rb', line 316

def currency_as_string=(val)
  @currency = Currency.wrap(val)
end

#default_formatting_rulesObject



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# File 'lib/money/money/formatting.rb', line 351

def default_formatting_rules
  self.class.default_formatting_rules || {}
end

#dollarsBigDecimal

Assuming using a currency using dollars: Returns the value of the money in dollars, instead of in the fractional unit cents.

Synonym of #amount

Examples:

Money.new(1_00, "USD").dollars   # => BigDecimal.new("1.00")

Returns:

  • (BigDecimal)

See Also:



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# File 'lib/money/money.rb', line 280

def dollars
  amount
end

#exchange_to(other_currency) {|n| ... } ⇒ Money

Receive the amount of this money object in another Currency.

Examples:

Money.new(2000, "USD").exchange_to("EUR")
Money.new(2000, "USD").exchange_to("EUR") {|x| x.round}
Money.new(2000, "USD").exchange_to(Currency.new("EUR"))

Parameters:

  • other_currency (Currency, String, Symbol)

    Currency to exchange to.

Yields:

  • (n)

    Optional block to use when rounding after exchanging one currency for another.

Yield Parameters:

  • n (Float)

    The resulting float after exchanging one currency for another.

Yield Returns:

  • (Integer)

Returns:



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# File 'lib/money/money.rb', line 431

def exchange_to(other_currency, &rounding_method)
  other_currency = Currency.wrap(other_currency)
  if self.currency == other_currency
    self
  else
    @bank.exchange_with(self, other_currency, &rounding_method)
  end
end

#fractionalInteger, BigDecimal

The value of the monetary amount represented in the fractional or subunit of the currency.

For example, in the US dollar currency the fractional unit is cents, and there are 100 cents in one US dollar. So given the Money representation of one US dollar, the fractional interpretation is 100.

Another example is that of the Kuwaiti dinar. In this case the fractional unit is the fils and there 1000 fils to one Kuwaiti dinar. So given the Money representation of one Kuwaiti dinar, the fractional interpretation is 1000.

Returns:

  • (Integer)

    when infinite_precision is false

  • (BigDecimal)

    when infinite_precision is true

See Also:



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# File 'lib/money/money.rb', line 52

def fractional
  # Ensure we have a BigDecimal. If the Money object is created
  # from YAML, @fractional can end up being set to a Float.
  fractional = as_d(@fractional)

  return_value(fractional)
end

#hashFixnum

Returns a Fixnum hash value based on the fractional and currency attributes in order to use functions like & (intersection), group_by, etc.

Examples:

Money.new(100).hash #=> 908351

Returns:

  • (Fixnum)


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# File 'lib/money/money.rb', line 327

def hash
  [fractional.hash, currency.hash].hash
end

#inspectString

Common inspect function

Returns:



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# File 'lib/money/money.rb', line 344

def inspect
  "#<#{self.class.name} fractional:#{fractional} currency:#{currency}>"
end

#localize_formatting_rules(rules) ⇒ Object



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# File 'lib/money/money/formatting.rb', line 378

def localize_formatting_rules(rules)
  if currency.iso_code == "JPY" && I18n.locale == :ja
    rules[:symbol] = "" unless rules[:symbol] == false
    rules[:symbol_position] = :after
    rules[:symbol_after_without_space] = true
  end
  rules
end

#regexp_format(formatted, rules, decimal_mark, symbol_value) ⇒ Object



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# File 'lib/money/money/formatting.rb', line 355

def regexp_format(formatted, rules, decimal_mark, symbol_value)
  regexp_decimal = Regexp.escape(decimal_mark)
  if rules[:south_asian_number_formatting]
    /(\d+?)(?=(\d\d)+(\d)(?:\.))/
  else
    # Symbols may contain decimal marks (E.g "դր.")
    if formatted.sub(symbol_value.to_s, "") =~ /#{regexp_decimal}/
      /(\d)(?=(?:\d{3})+(?:#{regexp_decimal}))/
    else
      /(\d)(?=(?:\d{3})+(?:[^\d]{1}|$))/
    end
  end
end

#round(rounding_mode = self.class.rounding_mode) ⇒ Money

Note:

This method is only useful when operating with infinite_precision turned on. Without infinite_precision values are rounded to the smallest unit of coinage automatically.

Round the monetary amount to smallest unit of coinage.

Examples:

Money.new(10.1, 'USD').round #=> Money.new(10, 'USD')

Returns:

See Also:



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# File 'lib/money/money.rb', line 540

def round(rounding_mode = self.class.rounding_mode)
  if self.class.infinite_precision
    self.class.new(fractional.round(0, rounding_mode), self.currency)
  else
    self
  end
end

#round_to_nearest_cash_valueInteger, BigDecimal

Round a given amount of money to the nearest possible amount in cash value. For example, in Swiss franc (CHF), the smallest possible amount of cash value is CHF 0.05. Therefore, this method rounds CHF 0.07 to CHF 0.05, and CHF 0.08 to CHF 0.10.

Returns:

  • (Integer)

    when infinite_precision is false

  • (BigDecimal)

    when infinite_precision is true

See Also:



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# File 'lib/money/money.rb', line 69

def round_to_nearest_cash_value
  unless self.currency.smallest_denomination
    raise UndefinedSmallestDenomination, 'Smallest denomination of this currency is not defined'
  end

  fractional = as_d(@fractional)
  smallest_denomination = as_d(self.currency.smallest_denomination)
  rounded_value = (fractional / smallest_denomination).round(0, self.class.rounding_mode) * smallest_denomination

  return_value(rounded_value)
end

#split(num) ⇒ Array<Money>

Split money amongst parties evenly without losing pennies.

Examples:

Money.new(100, "USD").split(3) #=> [Money.new(34), Money.new(33), Money.new(33)]

Parameters:

  • num (Numeric)

    number of parties.

Returns:

Raises:

  • (ArgumentError)


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# File 'lib/money/money.rb', line 515

def split(num)
  raise ArgumentError, "need at least one party" if num < 1

  if self.class.infinite_precision
    split_infinite(num)
  else
    split_flat(num)
  end
end

#symbolString

Uses Currency#symbol. If nil is returned, defaults to “¤”.

Examples:

Money.new(100, "USD").symbol #=> "$"

Returns:



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# File 'lib/money/money.rb', line 337

def symbol
  currency.symbol || "¤"
end

#symbol_position_from(rules) ⇒ Object



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# File 'lib/money/money/formatting.rb', line 405

def symbol_position_from(rules)
  if rules.has_key?(:symbol_position)
    if [:before, :after].include?(rules[:symbol_position])
      return rules[:symbol_position]
    else
      raise ArgumentError, ":symbol_position must be ':before' or ':after'"
    end
  elsif currency.symbol_first?
    :before
  else
    :after
  end
end

#symbol_value_from(rules) ⇒ Object



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# File 'lib/money/money/formatting.rb', line 387

def symbol_value_from(rules)
  if rules.has_key?(:symbol)
    if rules[:symbol] === true
      symbol
    elsif rules[:symbol]
      rules[:symbol]
    else
      ""
    end
  elsif rules[:html]
    currency.html_entity == '' ? currency.symbol : currency.html_entity
  elsif rules[:disambiguate] and currency.disambiguate_symbol
    currency.disambiguate_symbol
  else
    symbol
  end
end

#to_dBigDecimal

Return the amount of money as a BigDecimal.

Examples:

Money.us_dollar(1_00).to_d #=> BigDecimal.new("1.00")

Returns:

  • (BigDecimal)


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# File 'lib/money/money.rb', line 376

def to_d
  as_d(fractional) / as_d(currency.subunit_to_unit)
end

#to_fFloat

Return the amount of money as a float. Floating points cannot guarantee precision. Therefore, this function should only be used when you no longer need to represent currency or working with another system that requires floats.

Examples:

Money.us_dollar(100).to_f #=> 1.0

Returns:

  • (Float)


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# File 'lib/money/money.rb', line 399

def to_f
  to_d.to_f
end

#to_iInteger

Return the amount of money as a Integer.

Examples:

Money.us_dollar(1_00).to_i #=> 1

Returns:

  • (Integer)


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# File 'lib/money/money.rb', line 386

def to_i
  to_d.to_i
end

#to_money(given_currency = nil) ⇒ self

Conversation to self.

Returns:

  • (self)


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# File 'lib/money/money.rb', line 406

def to_money(given_currency = nil)
  given_currency = Currency.wrap(given_currency)
  if given_currency.nil? || self.currency == given_currency
    self
  else
    exchange_to(given_currency)
  end
end

#to_sString

Returns the amount of money as a string.

Examples:

Money.ca_dollar(100).to_s #=> "1.00"

Returns:



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# File 'lib/money/money.rb', line 354

def to_s
  unit, subunit, fraction = strings_from_fractional

  str = if currency.decimal_places == 0
          if fraction == ""
            unit
          else
            "#{unit}#{decimal_mark}#{fraction}"
          end
        else
          "#{unit}#{decimal_mark}#{pad_subunit(subunit)}#{fraction}"
        end

  fractional < 0 ? "-#{str}" : str
end

#translate_formatting_rules(rules) ⇒ Object



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# File 'lib/money/money/formatting.rb', line 369

def translate_formatting_rules(rules)
  begin
    rules[:symbol] = I18n.t currency.iso_code, :scope => "number.currency.symbol", :raise => true
  rescue I18n::MissingTranslationData
    # Do nothing
  end
  rules
end