Change a value of a variable in memory

Question

I have a field token_number in my database which i want to assign 1 more than the previous record.

for example in terms of array

 token_number[2] = token_number[1] + 1

And the value would be 1 for the first record. How can a assign a variable in the model which changes everytime i create a new record from my controller.

And my next condition is that the variable be reset to 0 every time when the current time i.e Time.now is the midnight. I tried it like this

class Ticket < ApplicationRecord
    before_create :update_token_number

private
    def update_token_number
        date = Time.now
         time_zone = Time.zone # any time zone really
         timeday = time_zone.local(date.year, date.month, date.day)
         midday = timeday.beginning_of_day
        if date == midday
            num = 0
            num = num + 1
        else
            num = num + 1
        end
            self.token_num = num
        #end
    end
end

if it runs also the value given to the field is always 1.

Please help

Pramod · Accepted Answer · 2017-06-15 06:00:39Z

1

I suggest you to right a rake task using whenever gem to reset token_number to 0. Something like

every 1.day, :at => '12:00 am' do
  runner "Ticket.reset_token_number"
end

and use the before_create callback to update the value as you mentioned in the code snippet.

class Ticket < ApplicationRecord
  before_create :update_token_number

private
  def update_token_number
    self.token_num +=1
  end
end

answered Jun 15, 2017 at 6:00

Pramod

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3 Comments

Deepak Mahakale Over a year ago

You need to change method to class method self.update_token_number

Mannish Over a year ago

@promond thanks but could u please tell me in detail as i m not that well aware of rake task. Sorry to bother but if u could elaborate it then could be big help. If i m missing anything in information then please ask....

Pramod Over a year ago

@Mannish If you go through the documentation of whenever gem, github.com/javan/whenever. You will get to know how to schedule tasks.

PrimeTimeTran · Accepted Answer · 2017-06-15 05:58:27Z

0

If I were you I would not manually create tokens like this. I think you should try Json Web Token Gem.

answered Jun 15, 2017 at 5:58

PrimeTimeTran

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1 Comment

Mannish Over a year ago

that would be great if i could do it with gem, I will try anyhow but want to learn this as well so that i can be confident in future while doing other stuffs relating to this issue, Thanks

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