Scope with joins in Rails 4.2

Question

I've got code similar to

class Article < ActiveRecord::Base
  has_many :comments
  scope :with_comments, joins(:comments)
end

based on this answer, but when I use it in Rails 4.2, I get

/Users/agrimm/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/scoping/named.rb:143:in `scope': The scope body needs to be callable. (ArgumentError)

Have the rules with regards to allowing joins in scope changed between Rails 4 and Rails 4.2? I can see mention of joins in the 4.2 release notes, but I can't tell if it's applicable here.

this is change in Rails 4. http://api.rubyonrails.org/classes/ActiveRecord/Scoping/Named/ClassMethods.html — adamliesko, Jul 29 '15 at 07:36

score 3 · Accepted Answer · edited May 23 '17 at 12:13

3

The scope body needs to be callable. (ArgumentError)

This should work

scope :with_comments, -> { joins(:comments) }

A nice explanation here

edited May 23 '17 at 12:13

Community

1
1

answered Jul 29 '15 at 07:38

Pavan

33,316
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score 2 · Answer 2 · answered Jul 29 '15 at 07:37

2

Can you try it like this ?

scope :with_comments, -> { joins(:comments)}

answered Jul 29 '15 at 07:37

Nitin Satish Salunke

508
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score 2 · Answer 3 · answered Jul 29 '15 at 07:38

2

Your syntax is wrong. You should do as follows:

scope :with_comments, -> { joins(:comments) }

You should have a look at this documentation

answered Jul 29 '15 at 07:38

abhinavmsra

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Scope with joins in Rails 4.2

3 Answers3