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Every answer posted on SO (yes, I checked) seems to have require 'date' as a solution. I've done that and my code still won't work.

require 'date' yesterday = RepSched::Helpers.datestring(Date.yesterday)

For some reason, Ruby chokes on Date.yesterday

NoMethodError: undefined method `yesterday' for Date:Class

What am I doing wrong?

edit

Oh no! Now my problem is bigger than I thought. Now that I've realized that issue, I realize DateTime's behavior is different too!

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  • 4
    yesterday is a method added by Rails Commented Sep 3, 2014 at 14:56
  • 1
    You sure you're running under Rails? Commented Sep 3, 2014 at 14:56
  • Oh. Sinatra. Hah, woops! Commented Sep 3, 2014 at 14:57
  • Try require 'active_support/core_ext/date/calculations' Commented Sep 3, 2014 at 14:59
  • 1
    @sent1nel Don't do that if you're not running under Rails :) Commented Sep 3, 2014 at 15:04

2 Answers 2

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yesterday is provided by Rails / Active Support. You can either require it in your non-Rails project:

require 'active_support/core_ext/date/calculations' Date.yesterday #=> #<Date: 2014-09-02 ((2456903j,0s,0n),+0s,2299161j)>

Or calculate it yourself:

require 'date' Date.today - 1 #=> #<Date: 2014-09-02 ((2456903j,0s,0n),+0s,2299161j)>
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6

Rails can be a bit of a pain because it adds new methods to Date which surprises many newcomers to Ruby. You can get yesterday, without using Rails by doing:

$ pry [1] pry(main)> require 'date' => false [2] pry(main)> Date.today => #<Date: 2014-09-03 ((2456904j,0s,0n),+0s,2299161j)> [4] pry(main)> Date.today - 1 => #<Date: 2014-09-02 ((2456903j,0s,0n),+0s,2299161j)>
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I've chosen this answer because it better describes my problem.

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