Rails 4 default scope

Question

In my Rails app have a default scope that looks like this:

default_scope order: 'external_updated_at DESC'

I have now upgraded to Rails 4 and, of course, I get the following deprecation warning "Calling #scope or #default_scope with a hash is deprecated. Please use a lambda containing a scope.". I have successfully converted my other scopes but I don't know what the syntax for default_scope should be. This doesn't work:

default_scope, -> { order: 'external_updated_at' }

Related: should default_scope be [avoided altogether](https://github.com/rails/rails/issues/13965#issuecomment-34407465), and what are some alternative approaches? — Jay, Nov 11 '14 at 18:18

score 152 · Accepted Answer · edited Jan 12 '19 at 03:28

152

Should be only:

class Ticket < ActiveRecord::Base
  default_scope -> { order(:external_updated_at) } 
end

default_scope accept a block, lambda is necessary for scope(), because there are 2 parameters, name and block:

class Shirt < ActiveRecord::Base
  scope :red, -> { where(color: 'red') }
end

edited Jan 12 '19 at 03:28

blnc

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answered Aug 29 '13 at 08:44

Luke

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Thanks for the explanation, Luke. I got a syntax error, then I changed it to default_scope { order('external_updated_at') } and it worked. Can you edit your answer, please, so I can accpet it? – Joe Gatt Aug 29 '13 at 09:08
6

This didn't work for me in 4.0.2 without the arrow. My working solution was ```default_scope -> { order_by(:created_at => :desc) }``` – genkilabs Feb 07 '14 at 01:31
1

By convention, symbols are preferred when referencing attributes. `default_scope { order(:external_updated_at) }` – scarver2 Aug 11 '14 at 21:05
3

BTW The correct answer to @JoeGatt question is `default_scope order('external_updated_at DESC')` – scarver2 Aug 11 '14 at 21:22
This does not address ordering if you have results that have varied case (upcase vs. downcase)... any thoughts on ordering via default_scope while forcing downcase? – Kees Briggs May 24 '15 at 19:59

score 21 · Answer 2 · edited Feb 07 '14 at 09:56

21

This is what worked for me:

default_scope  { order(:created_at => :desc) }

edited Feb 07 '14 at 09:56

Baby Groot

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answered Feb 07 '14 at 09:31

qubit

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In new Ruby syntax: `default_scope { order(created_at: :desc) }` – Jeehut Aug 05 '15 at 08:52

score 7 · Answer 3 · answered Apr 21 '14 at 17:54

7

This also worked for me:

default_scope { order('created_at DESC') }

answered Apr 21 '14 at 17:54

Alex Hawkins

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score 2 · Answer 4 · answered Oct 08 '14 at 12:51

2

This worked from me (just for illustration with a where) because I came to this topic via the same problem.

default_scope { where(form: "WorkExperience") }

answered Oct 08 '14 at 12:51

FastSolutions

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score 2 · Answer 5 · answered Sep 26 '16 at 16:30

You can also use the lambda keyword. This is useful for multiline blocks.

default_scope lambda {
  order(external_updated_at: :desc)
}

which is equivalent to

default_scope -> { order(external_updated_at: :desc) }

and

default_scope { order(external_updated_at: :desc) }

score 1 · Answer 6 · answered Dec 30 '14 at 09:48

1

This works for me in Rails 4

default_scope { order(external_updated_at: :desc) }

answered Dec 30 '14 at 09:48

Hovo

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score 0 · Answer 7 · answered Aug 25 '16 at 15:29

0

default_scope -> { order(created_at: :desc) }

Don't forget the -> symbol

answered Aug 25 '16 at 15:29

Abel

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score 0 · Answer 8 · edited Sep 07 '16 at 16:12

0

default_scope { 
      where(published: true) 
}

Try This.

edited Sep 07 '16 at 16:12

Hamza Zafeer

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answered Sep 07 '16 at 14:07

aliAsadi92

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Rails 4 default scope

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