导致此无效日期错误的原因是什么？

Question

在这行代码上:

@note.date = Date.strptime(params[:custom_date], '%d-%m-%Y') unless params[:custom_date].blank?

我收到此错误:

ArgumentError: invalid date
/usr/ruby1.9.2/lib/ruby/1.9.1/date.rb:1022

以下是参数:

{
  "commit"             => "Create",
  "utf8"               => "\342\234\223",
  "authenticity_token" => "RKYZNmRaElg/hT5tlmLcqnstnOapdhiaWmDcjNDtSOI=",
  "action"             => "create",
  "note"               => { "name"=>"note1", "detail"=>"detail" },
  "controller"         => "notes",
  "custom_date"        => "03-03-2010"
}

导致此错误的原因是什么？谢谢阅读.

Answer 1

你得到的参数是

{"commit"=>"Create",
 "utf8"=>"\342\234\223",
 "authenticity_token"=>"RKYZNmRaElg/hT5tlmLcqnstnOapdhiaWmDcjNDtSOI=",
 "action"=>"create",
 "note"=>
  {"name"=>"note1",
   "detail"=>"detail"},
 "controller"=>"notes",
 "custom_date"=>"03-03-2010"}

因此我们可以清楚地表明

它不是,params[:custom_date]但它是params['custom_date']

UPDATE

Date.strptime方法遵循特定模式.例如

str = "01-12-2010" #DD-MM-YYYY
then use
Date.strptime(str,"%d-%m-%Y")

但如果

str = "2010-12-01" #YYYY-MM-DD
then use
Date.strptime(str,"%Y-%m-%d")