Question

我在ruby中写了以下内容

t = Time.now
    t.strftime("%Y-%d-%m")

SCHEDULER.every '1m', :first_in => 0 do |job|
  send_event('gmail_gh', {current: gmail.inbox.count(:after => Date.parse(t)), older: gmail.inbox.count})

但是我得到了这个错误

scheduler caught exception:
can't convert Time into String
/var/dashing/cdmdash/jobs/gmail_gh.rb:21:in `parse'
/var/dashing/cdmdash/jobs/gmail_gh.rb:21:in `block in <top (required)>'
/usr/local/rvm/gems/ruby-1.9.3-p327/gems/rufus-scheduler-2.0.17/lib/rufus/sc/jobs.rb:231:in `call'
/usr/local/rvm/gems/ruby-1.9.3-p327/gems/rufus-scheduler-2.0.17/lib/rufus/sc/jobs.rb:231:in `trigger_block'
/usr/local/rvm/gems/ruby-1.9.3-p327/gems/rufus-scheduler-2.0.17/lib/rufus/sc/jobs.rb:191:in `block in trigger'
/usr/local/rvm/gems/ruby-1.9.3-p327/gems/rufus-scheduler-2.0.17/lib/rufus/sc/scheduler.rb:416:in `call'
/usr/local/rvm/gems/ruby-1.9.3-p327/gems/rufus-scheduler-2.0.17/lib/rufus/sc/scheduler.rb:416:in `block in trigger_job'

我认为它与t变量有关，而且它不是一个修正，我是Ruby的新手，所以我很高兴

Answer 1

如果你看一下gem文档，你会看到：after和：params之前的格式为YYYY-MM-DD。

来自宝石自述：

gmail.inbox.count(:after => Date.parse("2010-02-20"), :before => Date.parse("2010-03-20"))
gmail.inbox.count(:on => Date.parse("2010-04-15"))

您的代码正在传递YYYY-DD-MM，这可能会导致错误。

修改

当你在datetime对象上调用strftime时，它不会修改对象 - 只会根据你给出的格式返回字符串表示法。

结果，Date.parse（t）仍然是Time.now是一个参数。

试试这个：

t = Time.now.strftime("%Y-%m-%d") Date.parse(t)

Ruby Newbie strftime Time.Now

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