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Active Support Duration

使用 Date#advanceTime#advance 分別提供準確的日期和時間測量。它主要支援 Numeric 上的方法。

1.month.ago       # equivalent to Time.now.advance(months: -1)
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常數

PARTS = [:years, :months, :weeks, :days, :hours, :minutes, :seconds].freeze
 
PARTS_IN_SECONDS = { seconds: 1, minutes: SECONDS_PER_MINUTE, hours: SECONDS_PER_HOUR, days: SECONDS_PER_DAY, weeks: SECONDS_PER_WEEK, months: SECONDS_PER_MONTH, years: SECONDS_PER_YEAR }.freeze
 
SECONDS_PER_DAY = 86400
 
SECONDS_PER_HOUR = 3600
 
SECONDS_PER_MINUTE = 60
 
SECONDS_PER_MONTH = 2629746
 
SECONDS_PER_WEEK = 604800
 
SECONDS_PER_YEAR = 31556952
 
VARIABLE_PARTS = [:years, :months, :weeks, :days].freeze
 

屬性

[R] value

類別公開方法

build(value)

從轉換為個別部分的秒數值建立新的 Duration

ActiveSupport::Duration.build(31556952).parts # => {:years=>1}
ActiveSupport::Duration.build(2716146).parts  # => {:months=>1, :days=>1}
# File activesupport/lib/active_support/duration.rb, line 189
def build(value)
  unless value.is_a?(::Numeric)
    raise TypeError, "can't build an #{self.name} from a #{value.class.name}"
  end

  parts = {}
  remainder_sign = value <=> 0
  remainder = value.round(9).abs
  variable = false

  PARTS.each do |part|
    unless part == :seconds
      part_in_seconds = PARTS_IN_SECONDS[part]
      parts[part] = remainder.div(part_in_seconds) * remainder_sign
      remainder %= part_in_seconds

      unless parts[part].zero?
        variable ||= VARIABLE_PARTS.include?(part)
      end
    end
  end unless value == 0

  parts[:seconds] = remainder * remainder_sign

  new(value, parts, variable)
end

parse(iso8601duration)

根據 ISO 8601 Duration 格式化的字串,建立一個新的 Duration

有關更多資訊,請參閱 ISO 8601。此方法允許在模式中存在負數部分。如果提供無效的字串,它會引發 ActiveSupport::Duration::ISO8601Parser::ParsingError

# File activesupport/lib/active_support/duration.rb, line 144
def parse(iso8601duration)
  parts = ISO8601Parser.new(iso8601duration).parse!
  new(calculate_total_seconds(parts), parts)
end

執行個體公開方法

%(other)

傳回此 Duration 除以另一個 DurationNumeric 的餘數。 Numeric 值視為秒數。

# File activesupport/lib/active_support/duration.rb, line 307
def %(other)
  if Duration === other || Scalar === other
    Duration.build(value % other.value)
  elsif Numeric === other
    Duration.build(value % other)
  else
    raise_type_error(other)
  end
end

*(other)

將此 Duration 乘以 Numeric,並傳回新的 Duration

# File activesupport/lib/active_support/duration.rb, line 282
def *(other)
  if Scalar === other || Duration === other
    Duration.new(value * other.value, @parts.transform_values { |number| number * other.value }, @variable || other.variable?)
  elsif Numeric === other
    Duration.new(value * other, @parts.transform_values { |number| number * other }, @variable)
  else
    raise_type_error(other)
  end
end

+(other)

將另一個 DurationNumeric 加到此 DurationNumeric 值視為秒數。

# File activesupport/lib/active_support/duration.rb, line 263
def +(other)
  if Duration === other
    parts = @parts.merge(other._parts) do |_key, value, other_value|
      value + other_value
    end
    Duration.new(value + other.value, parts, @variable || other.variable?)
  else
    seconds = @parts.fetch(:seconds, 0) + other
    Duration.new(value + other, @parts.merge(seconds: seconds), @variable)
  end
end

-(other)

從此 Duration 減去另一個 DurationNumericNumeric 值會被視為秒數。

# File activesupport/lib/active_support/duration.rb, line 277
def -(other)
  self + (-other)
end

/(other)

將此 Duration 除以 Numeric,並傳回新的 Duration

# File activesupport/lib/active_support/duration.rb, line 293
def /(other)
  if Scalar === other
    Duration.new(value / other.value, @parts.transform_values { |number| number / other.value }, @variable)
  elsif Duration === other
    value / other.value
  elsif Numeric === other
    Duration.new(value / other, @parts.transform_values { |number| number / other }, @variable)
  else
    raise_type_error(other)
  end
end

<=>(other)

將一個 Duration 與另一個 DurationNumeric 與此 Duration 進行比較。 Numeric 值會被視為秒數。

# File activesupport/lib/active_support/duration.rb, line 253
def <=>(other)
  if Duration === other
    value <=> other.value
  elsif Numeric === other
    value <=> other
  end
end

==(other)

如果 other 也是具有相同 valueDuration 執行個體,或如果 other == value,則傳回 true

# File activesupport/lib/active_support/duration.rb, line 336
def ==(other)
  if Duration === other
    other.value == value
  else
    other == value
  end
end

after(time = ::Time.current)

別名: since

ago(time = ::Time.current)

計算一個新的 TimeDate,它與此 Duration 所代表的時間點一樣遙遠。

別名: untilbefore
# File activesupport/lib/active_support/duration.rb, line 439
def ago(time = ::Time.current)
  sum(-1, time)
end

before(time = ::Time.current)

別名:ago

eql?(other)

如果 other 也是一個 Duration 實例,且與此實例具有相同的部份,則傳回 true

# File activesupport/lib/active_support/duration.rb, line 421
def eql?(other)
  Duration === other && other.value.eql?(value)
end

from_now(time = ::Time.current)

別名: since

hash()

# File activesupport/lib/active_support/duration.rb, line 425
def hash
  @value.hash
end

in_days()

傳回持續時間涵蓋的天數,以浮點數表示

12.hours.in_days # => 0.5
# File activesupport/lib/active_support/duration.rb, line 394
def in_days
  in_seconds / SECONDS_PER_DAY.to_f
end

in_hours()

傳回持續時間涵蓋的小時數,以浮點數表示

1.day.in_hours # => 24.0
# File activesupport/lib/active_support/duration.rb, line 387
def in_hours
  in_seconds / SECONDS_PER_HOUR.to_f
end

in_minutes()

傳回持續時間涵蓋的分鐘數,以浮點數表示

1.day.in_minutes # => 1440.0
# File activesupport/lib/active_support/duration.rb, line 380
def in_minutes
  in_seconds / SECONDS_PER_MINUTE.to_f
end

in_months()

以浮點數回傳期間涵蓋的月份數

9.weeks.in_months # => 2.07
# File activesupport/lib/active_support/duration.rb, line 408
def in_months
  in_seconds / SECONDS_PER_MONTH.to_f
end

in_seconds()

別名為:to_i

in_weeks()

以浮點數回傳期間涵蓋的週數

2.months.in_weeks # => 8.696
# File activesupport/lib/active_support/duration.rb, line 401
def in_weeks
  in_seconds / SECONDS_PER_WEEK.to_f
end

in_years()

以浮點數回傳期間涵蓋的年數

30.days.in_years # => 0.082
# File activesupport/lib/active_support/duration.rb, line 415
def in_years
  in_seconds / SECONDS_PER_YEAR.to_f
end

iso8601(precision: nil)

為此期間建立 ISO 8601 Duration 字串。precision 參數可用於限制期間的秒數精確度。

# File activesupport/lib/active_support/duration.rb, line 468
def iso8601(precision: nil)
  ISO8601Serializer.new(self, precision: precision).serialize
end

parts()

回傳定義期間的 parts hash 副本

# File activesupport/lib/active_support/duration.rb, line 236
def parts
  @parts.dup
end

since(time = ::Time.current)

計算一個新的 TimeDate,它與此 Duration 所代表的時間一樣遙遠。

別名為:from_nowafter
# File activesupport/lib/active_support/duration.rb, line 431
def since(time = ::Time.current)
  sum(1, time)
end

to_i()

傳回此 Duration 所代表的秒數。

1.minute.to_i   # => 60
1.hour.to_i     # => 3600
1.day.to_i      # => 86400

請注意,此轉換對某些期間的持續時間做了一些假設,例如:月份永遠是年份的 1/12,而年份是 365.2425 天。

# equivalent to (1.year / 12).to_i
1.month.to_i    # => 2629746

# equivalent to 365.2425.days.to_i
1.year.to_i     # => 31556952

在這種情況下,Ruby 核心 DateTime 應使用於精確的日期和時間算術。

也別名為: in_seconds
# File activesupport/lib/active_support/duration.rb, line 372
def to_i
  @value.to_i
end

to_s()

傳回持續時間涵蓋的秒數,作為字串。如需更多資訊,請查看 to_i 方法。

1.day.to_s # => "86400"
# File activesupport/lib/active_support/duration.rb, line 348
def to_s
  @value.to_s
end

until(time = ::Time.current)

別名:ago