看起来这不是一个Rails的功能,而是一个功能的ActiveSupport。它应该在开箱即用的灯具中正常工作;在例如IRB你需要require 'active_support/time'
。
$ irb
2.2.2 :001 > Time.utc(2015, 7, 1, 10, 5).to_s(:db)
ArgumentError: wrong number of arguments (1 for 0)
from (irb):1:in `to_s'
from (irb):1
from /Users/dmoles/.rvm/rubies/ruby-2.2.2/bin/irb:11:in `<main>'
2.2.2 :002 > require 'active_support/time'
=> true
2.2.2 :003 > Time.utc(2015, 7, 1, 10, 5).to_s(:db)
=> "2015-07-01 10:05:00"
但是请注意,这将下降时区信息:
2.2.2 :004 > Time.now.to_s(:db)
=> "2015-08-14 16:21:47"
而且的ActiveSupport的TimeWithZone
没有帮助:
$ irb
2.2.2 :001 > require 'active_support/time'
=> true
2.2.2 :002 > time_now = Time.now
=> 2015-08-14 16:31:31 -0700
2.2.2 :003 > time_now_utc = time_now.utc
=> 2015-08-14 23:31:31 UTC
2.2.2 :004 > time_now_with_zone = Time.now.in_time_zone
=> 2015-08-14 16:31:58 -0700
2.2.2 :005 > time_now_utc_with_zone = time_now_utc.in_time_zone
=> 2015-08-14 23:31:31 UTC
2.2.2 :006 > time_now_with_zone.to_s(:db)
=> "2015-08-14 16:31:58"
2.2.2 :007 > time_now_utc_with_zone.to_s(:db)
=> "2015-08-14 23:31:31"
At least in SQLite,这是你要确保你的日期在进入数据库之前都会一直转换为一个时区。
看起来你已经弄明白了:-) –