How to properly hook into after_create in Rails model

Question

I currently have something like this:

class Article

  # fields = [flag, something]

  after_create :update_flag

  def update_flag
    self.flag = 1 if something_changed?
  end
end

But it doesn't change the 'flag' field when I change the something field. I've saved the object. Still no changes.

a = Article.create(flag: 0, something: "content")
a.something = "different"
a.save

a.flag
> 0

Any ideas?

6 years! haha it is funny looking back on your complete lack of understanding :D — Damien Roche, Nov 16 '18 at 13:34

score 7 · Accepted Answer · edited Nov 05 '18 at 10:02

7

Change

after_create

to

after_update

In your code example you're updating the object and that's the reason why you need a different hook. Please see docs for further information.

edited Nov 05 '18 at 10:02

Josien

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answered Jul 14 '12 at 10:37

lucapette

20,564
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Thank you very much, that worked. I was confused because I thought after_create hook was run whenever an object was initialized. I see I need to learn my hooks. Thanks again. – Damien Roche Jul 14 '12 at 10:40

score 0 · Answer 2 · answered Jan 20 '16 at 07:40

0

after_create()

Is called after Base.save on new objects that haven‘t been saved yet (no record exists).

after_save()

Is called after Base.save (regardless of whether it‘s a create or update save).`

answered Jan 20 '16 at 07:40

Amit Mutreja

168
1
7

score 0 · Answer 3 · edited May 23 '17 at 12:01

0

Change "after_create" to "after_save" because after_create only works once - just after the record is first created & after_save works every time you save the object - even if you're just updating it many years later.

Reference- What is the difference between `after_create` and `after_save` and when to use which?

edited May 23 '17 at 12:01

Community

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answered Nov 17 '16 at 06:28

Piyush Chaudhary

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How to properly hook into after_create in Rails model

3 Answers3