Rails: Undefined method in model

Question

I'd like to convert a unix time to human time before saving my object from an api. But I cannot access to my method format date, it raise me :

undefined method `format_date' for 1467738900000:Fixnum

My model :

class Conference < ActiveRecord::Base
validates_presence_of :title, :date
validates :date, :uniqueness => true

 def self.save_conference_from_api
    data = self.new.data_from_api
    self.new.parisrb_conferences(data).each do |line|
      conference = self.new
      conference.title = line['name']
      conference.date = line['time'].format_date
      conference.url = line['link']
      if conference.valid?
        conference.save
      end
    end
    self.all
 end

 def format_date
   DateTime.strptime(self.to_s,'%Q')
 end

As the error suggests, line['time'] is a number, not an instance of your class Conference. And the reason is not in the code you posted. — Mladen Jablanović
– Mladen Jablanović, Commented Jul 2, 2016 at 15:32

souslov · Accepted Answer · 2016-07-02 15:42:44Z

1

line['time'] is not an instance of your Conference class, so you can't call format_date method on it. Instead, for example, you can make format_date a class method:

def self.format_date str
  DateTime.strptime(str.to_s,'%Q')
end

And then call it like this:

conference.date = format_date(line['time'])

The other option is to use a before_validation callback (attribute assignment will be as follows: conference.date = line['time'] and there is no need for format_date method):

before_validation -> r { r.date = DateTime.strptime(r.date.to_s,'%Q') }

edited Jul 2, 2016 at 15:42

answered Jul 2, 2016 at 15:35

souslov

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Comments

Kumar · Accepted Answer · 2016-07-02 15:35:22Z

1

You are getting the date in unix time milliseconds. You can do like this

conference.date = DateTime.strptime(line['time'].to_s,'%Q')

answered Jul 2, 2016 at 15:35

Kumar

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1 Comment

Orsay Over a year ago

Thank you for the proposition it was my first idea but I wanted to do a method to do it.

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