Class: Money

Inherits:
Object
  • Object
show all
Extended by:
Constructors
Includes:
Comparable, Arithmetic
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/formatter.rb,
lib/money/money/allocation.rb,
lib/money/money/arithmetic.rb,
lib/money/money/constructors.rb,
lib/money/rates_store/memory.rb,
lib/money/currency/heuristics.rb,
lib/money/locale_backend/base.rb,
lib/money/locale_backend/i18n.rb,
lib/money/bank/single_currency.rb,
lib/money/money/locale_backend.rb,
lib/money/locale_backend/errors.rb,
lib/money/locale_backend/legacy.rb,
lib/money/bank/variable_exchange.rb,
lib/money/money/formatting_rules.rb,
lib/money/locale_backend/currency.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.

See Also:

Defined Under Namespace

Modules: Arithmetic, Bank, Constructors, LocaleBackend, RatesStore Classes: Allocation, Currency, Formatter, FormattingRules, UndefinedSmallestDenomination

Constant Summary collapse

VERSION = 
'6.19.0'

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 Arithmetic

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

Constructor Details

#initialize(obj, currency = Money.default_currency, options = {}) ⇒ 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.

  • options (Hash) (defaults to: {}) —

    Optional settings for the new Money instance

  • [Money::Bank::*] (Hash) —

    a customizable set of options

Raises:

  • (ArgumentError) 


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# File 'lib/money/money.rb', line 341

def initialize( obj, currency = Money.default_currency, options = {})
  # For backwards compatability, if options is not a Hash, treat it as a bank parameter
  unless options.is_a?(Hash)
    options = { bank: options }
  end

  @fractional = as_d(obj.respond_to?(:fractional) ? obj.fractional : obj)
  @currency   = obj.respond_to?(:currency) ? obj.currency : Currency.wrap(currency)
  @currency ||= Money.default_currency
  @bank       = obj.respond_to?(:bank) ? obj.bank : options[:bank]
  @bank     ||= Money.default_bank

  # BigDecimal can be Infinity and NaN, money of that amount does not make sense
  raise ArgumentError, 'must be initialized with a finite value' unless @fractional.finite?
end

Class Attribute Details

.conversion_precision ⇒ Integer

Used to specify precision for converting Rational to BigDecimal

Returns:

  • (Integer) 


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

attr_accessor :default_formatting_rules, :default_infinite_precision, :conversion_precision

.default_bank ⇒ Money::Bank::Base

Used to set a default bank for currency exchange.

Each Money object is associated with 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:



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

attr_accessor :default_formatting_rules, :default_infinite_precision, :conversion_precision

.default_formatting_rules ⇒ Hash

Used 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)

See Also:



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

def default_formatting_rules
  @default_formatting_rules
end

.default_infinite_precision ⇒ Boolean

Returns Use this to enable infinite precision cents as the global default.

Returns:

  • (Boolean) —

    Use this to enable infinite precision cents as the global default



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

attr_accessor :default_formatting_rules, :default_infinite_precision, :conversion_precision

.locale_backend ⇒ Object

Returns the value of attribute locale_backend.



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# File 'lib/money/money.rb', line 133

def locale_backend
  @locale_backend
end

.use_i18n ⇒ Boolean

Used to disable i18n even if it’s used by other components of your app.

Returns:

  • (Boolean) 


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

attr_accessor :default_formatting_rules, :default_infinite_precision, :conversion_precision

Instance Attribute Details

#bank ⇒ Object (readonly)

Returns the value of attribute bank.



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# File 'lib/money/money.rb', line 88

attr_reader :currency, :bank

#currency ⇒ Currency (readonly)

Returns The money’s currency.

Returns:

  • (Currency) —

    The money’s currency.



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# File 'lib/money/money.rb', line 88

def currency
  @currency
end

#default_currency ⇒ Money::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 152

def self.default_currency
  if @using_deprecated_default_currency
    warn '[WARNING] The default currency will change from `USD` to `nil` in the next major release. Make ' \
         'sure to set it explicitly using `Money.default_currency=` to avoid potential issues'
    @using_deprecated_default_currency = false
  end

  if @default_currency.respond_to?(:call)
    Money::Currency.new(@default_currency.call)
  else
    Money::Currency.new(@default_currency)
  end
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 282

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

.default_currency ⇒ Object 



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# File 'lib/money/money.rb', line 152

def self.default_currency
  if @using_deprecated_default_currency
    warn '[WARNING] The default currency will change from `USD` to `nil` in the next major release. Make ' \
         'sure to set it explicitly using `Money.default_currency=` to avoid potential issues'
    @using_deprecated_default_currency = false
  end

  if @default_currency.respond_to?(:call)
    Money::Currency.new(@default_currency.call)
  else
    Money::Currency.new(@default_currency)
  end
end

.default_currency=(currency) ⇒ Object 



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# File 'lib/money/money.rb', line 166

def self.default_currency=(currency)
  @using_deprecated_default_currency = false
  @default_currency = currency
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 288

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

.from_amount(amount, currency = default_currency, options = {}) ⇒ Money Also known as: from_dollars

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.

  • options (Hash) (defaults to: {}) —

    Optional settings for the new Money instance

  • [Money::Bank::*] (Hash) —

    a customizable set of options

Returns:

Raises:

  • (ArgumentError)

See Also:



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# File 'lib/money/money.rb', line 307

def self.from_amount(amount, currency = default_currency, options = {})
  raise ArgumentError, "'amount' must be numeric" unless Numeric === amount

  currency = Currency.wrap(currency) || Money.default_currency
  value = amount.to_d * currency.subunit_to_unit
  new(value, currency, options)
end

.infinite_precision ⇒ Object 



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# File 'lib/money/money.rb', line 136

def infinite_precision
  warn '[DEPRECATION] `Money.infinite_precision` is deprecated - use `Money.default_infinite_precision` instead'
  default_infinite_precision
end

.infinite_precision=(value) ⇒ Object 



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# File 'lib/money/money.rb', line 141

def infinite_precision=(value)
  warn '[DEPRECATION] `Money.infinite_precision=` is deprecated - use `Money.default_infinite_precision= ` instead'
  self.default_infinite_precision = value
end

.inherited(base) ⇒ Object 



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# File 'lib/money/money.rb', line 224

def self.inherited(base)
  base.setup_defaults
end

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

Use this to return the rounding mode.

Parameters:

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

Returns:

  • (BigDecimal::ROUND_MODE) —

    rounding mode



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# File 'lib/money/money.rb', line 235

def self.rounding_mode(mode = nil)
  if mode
    warn "[DEPRECATION] calling `rounding_mode` with a block is deprecated. Please use `.with_rounding_mode` instead."
    return with_rounding_mode(mode) { yield }
  end

  return Thread.current[:money_rounding_mode] if Thread.current[:money_rounding_mode]

  if @using_deprecated_default_rounding_mode
    warn '[WARNING] The default rounding mode will change from `ROUND_HALF_EVEN` to `ROUND_HALF_UP` in the ' \
         'next major release. Set it explicitly using `Money.rounding_mode=` to avoid potential problems.'
    @using_deprecated_default_rounding_mode = false
  end

  @rounding_mode
end

.rounding_mode=(new_rounding_mode) ⇒ Object 



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# File 'lib/money/money.rb', line 184

def self.rounding_mode=(new_rounding_mode)
  @using_deprecated_default_rounding_mode = false
  @rounding_mode = new_rounding_mode
end

.setup_defaults ⇒ Object 



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# File 'lib/money/money.rb', line 199

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")
  @using_deprecated_default_currency = true

  # Default to using i18n
  @use_i18n = true

  # Default to using legacy locale backend
  self.locale_backend = :legacy

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

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

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

.with_rounding_mode(mode) { ... } ⇒ Object

Temporarily changes the rounding mode in a given block.

Examples:

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

Parameters:

  • mode (BigDecimal::ROUND_MODE)

Yields:

  • The block within which rounding mode will be changed. Its return value will also be the return value of the whole method.

Returns:

  • (Object) —

    block results



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# File 'lib/money/money.rb', line 265

def self.with_rounding_mode(mode)
  Thread.current[:money_rounding_mode] = mode
  yield
ensure
  Thread.current[:money_rounding_mode] = nil
end

Instance Method Details

#allocate(parts) ⇒ Array<Money> Also known as: split

Splits a given amount in parts without losing pennies. The left-over pennies will be distributed round-robin amongst the parties. This means that parts listed first will likely receive more pennies than ones listed later.

Pass [2, 1, 1] as input to give twice as much to part1 as part2 or part3 which results in 50% of the cash to party1, 25% to part2, and 25% to part3. Passing a number instead of an array will split the amount evenly (without losing pennies when rounding).

Examples:

Money.new(5,   "USD").allocate([3, 7]) #=> [Money.new(2), Money.new(3)]
Money.new(100, "USD").allocate([1, 1, 1]) #=> [Money.new(34), Money.new(33), Money.new(33)]
Money.new(100, "USD").allocate(2) #=> [Money.new(50), Money.new(50)]
Money.new(100, "USD").allocate(3) #=> [Money.new(34), Money.new(33), Money.new(33)]

Parameters:

  • parts (Array<Numeric>, Numeric) —

    how amount should be distributed to parts

Returns:



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# File 'lib/money/money.rb', line 595

def allocate(parts)
  amounts = Money::Allocation.generate(fractional, parts, !Money.default_infinite_precision)
  amounts.map { |amount| dup_with(fractional: amount) }
end

#amount ⇒ BigDecimal

Returns the numerical value of the money

Examples:

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

Returns:

  • (BigDecimal)

See Also:



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

def amount
  to_d
end

#as_ca_dollar ⇒ Money

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 561

def as_ca_dollar
  exchange_to("CAD")
end

#as_euro ⇒ Money

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 573

def as_euro
  exchange_to("EUR")
end

#as_us_dollar ⇒ Money

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 549

def as_us_dollar
  exchange_to("USD")
end

#cents ⇒ Integer, 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 33

def cents
  fractional
end

#currency_as_string ⇒ String

Return string representation of currency object

Examples:

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

Returns:

  • (String) 


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# File 'lib/money/money.rb', line 396

def currency_as_string
  warn "[DEPRECATION] `currency_as_string` is deprecated. Please use `.currency.to_s` instead."
  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 409

def currency_as_string=(val)
  warn "[DEPRECATION] `currency_as_string=` is deprecated - Money instances are immutable." \
    " Please use `with_currency` instead."
  @currency = Currency.wrap(val)
end

#decimal_mark ⇒ String

Returns a decimal mark according to the locale

Returns:

  • (String) 


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# File 'lib/money/money.rb', line 644

def decimal_mark
  (locale_backend && locale_backend.lookup(:decimal_mark, currency)) ||
    Money::Formatter::DEFAULTS[:decimal_mark]
end

#dollars ⇒ BigDecimal

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("1.00")

Returns:

  • (BigDecimal)

See Also:



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# File 'lib/money/money.rb', line 372

def dollars
  amount
end

#dup_with(options = {}) ⇒ Object 



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# File 'lib/money/money.rb', line 649

def dup_with(options = {})
  self.class.new(
    options[:fractional] || fractional,
    options[:currency] || currency,
    bank: options[:bank] || bank
  )
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 532

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

#format(*rules) ⇒ String

Creates a formatted price string according to several rules.

Parameters:

Returns:

  • (String) 


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# File 'lib/money/money.rb', line 627

def format(*rules)
  Money::Formatter.new(self, *rules).to_s
end

#fractional ⇒ Integer, 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 53

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

#hash ⇒ Integer

Returns a Integer 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:

  • (Integer) 


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# File 'lib/money/money.rb', line 422

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

#inspect ⇒ String

Common inspect function

Returns:

  • (String) 


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# File 'lib/money/money.rb', line 439

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

#round(rounding_mode = self.class.rounding_mode, rounding_precision = 0) ⇒ 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 616

def round(rounding_mode = self.class.rounding_mode, rounding_precision = 0)
  rounded_amount = as_d(@fractional).round(rounding_precision, rounding_mode)
  dup_with(fractional: rounded_amount)
end

#round_to_nearest_cash_value ⇒ Integer, 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 70

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

#symbol ⇒ String

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

Examples:

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

Returns:

  • (String) 


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# File 'lib/money/money.rb', line 432

def symbol
  currency.symbol || "¤"
end

#thousands_separator ⇒ String

Returns a thousands separator according to the locale

Returns:

  • (String) 


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# File 'lib/money/money.rb', line 635

def thousands_separator
  (locale_backend && locale_backend.lookup(:thousands_separator, currency)) ||
    Money::Formatter::DEFAULTS[:thousands_separator]
end

#to_d ⇒ BigDecimal

Return the amount of money as a BigDecimal.

Examples:

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

Returns:

  • (BigDecimal) 


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# File 'lib/money/money.rb', line 462

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

#to_f ⇒ Float

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 485

def to_f
  to_d.to_f
end

#to_i ⇒ Integer

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 472

def to_i
  to_d.to_i
end

#to_money(given_currency = nil) ⇒ self

Conversion to self.

Returns:

  • (self) 


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# File 'lib/money/money.rb', line 507

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_s ⇒ String

Returns the amount of money as a string.

Examples:

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

Returns:

  • (String) 


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# File 'lib/money/money.rb', line 449

def to_s
  format thousands_separator: '',
         no_cents_if_whole: currency.decimal_places == 0,
         symbol: false,
         ignore_defaults: true
end

#with_currency(new_currency) ⇒ self

Returns a new Money instance in a given currency leaving the amount intact and not performing currency conversion.

Parameters:

  • new_currency (Currency, String, Symbol) —

    Currency of the new object.

Returns:

  • (self) 


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# File 'lib/money/money.rb', line 495

def with_currency(new_currency)
  new_currency = Currency.wrap(new_currency)
  if !new_currency || currency == new_currency
    self
  else
    dup_with(currency: new_currency)
  end
end