Ruby日期算术错误-“;can';t将日期转换为精确数字(TypeError)“;
我有以下Ruby程序:Ruby日期算术错误-“;can';t将日期转换为精确数字(TypeError)“;,ruby,Ruby,我有以下Ruby程序: require 'date' class Person def initialize(name, dob) @name = name @dob = dob end def age Time.now - @dob end def marry(someone) "Life: " + age.to_s end end fred = Person.new('Fred', Date.new(1934, 4, 16)) p fred p fre
require 'date'
class Person
def initialize(name, dob)
@name = name
@dob = dob
end
def age
Time.now - @dob
end
def marry(someone)
"Life: " + age.to_s
end
end
fred = Person.new('Fred', Date.new(1934, 4, 16))
p fred
p fred.age.to_s
p fred.marry(1)
但是ruby 1.9.2给出了错误:
#<Person:0x2afab78 @name="Fred", @dob=#<Date: 1934-04-16 (4855087/2,0,2299161)>>
test1.rb:11:in `-': can't convert Date into an exact number (TypeError)
from test1.rb:11:in `age'
from test1.rb:22:in `<main>'
#
test1.rb:11:in`-':无法将日期转换为精确数字(TypeError)
来自test1.rb:11:in‘age’
来自test1.rb:22:in`'
我做错了什么?
TIA您试图从
时间中减去日期
:
ruby-1.9.1-p378 > Time.now - Date.today
TypeError: can't convert Date into Float
但您可以安全地从日期中减去日期:
ruby-1.9.1-p378 > Date.today - Date.new(1900,1,1)
=> (40466/1)
ruby-1.9.1-p378 > (Date.today - Date.new(1900,1,1)).to_f / 365 # years
=> 110.865753424658