undefined method `default_scoped?' while accessing scope

Question

I am getting this error while accessing scopes.

Here is AR model

class StatisticVariable < ActiveRecord::Base
  attr_accessible :code, :name

  has_many  :statistic_values

  scope :logins, where(code: 'logins').first
  scope :unique_logins, where(code: 'unique_logins').first
  scope :registrations, where(code: 'registrations').first

end

and when I try with StatisticVariable.logins or any other scopes it gives:

NoMethodError: undefined method `default_scoped?'

If I configure scope as class method then it works perfectly.

def self.registrations
    where(code: 'registrations').first
end

Please guide me to understand and fix this problem.

score 29 · Accepted Answer · edited May 30 '14 at 04:12

29

Your so called scopes are not scopes: they aren't chainable.

I guess Rails tries to append a potential default_scope to your result which leads to failure.

Do something like:

  scope :logins, where(code: 'logins')
  scope :unique_logins, where(code: 'unique_logins')
  scope :registrations, where(code: 'registrations')

  def self.login
    logins.first
  end

edited May 30 '14 at 04:12

zishe

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answered Sep 11 '12 at 07:55

apneadiving

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Ah, thanks for this! I got this when changing `default_scope order: "foo"` to `default_scope { { order: "foo" } }`. Fixed it by changing it to `default_scope { order("foo") }`. – Henrik N Feb 27 '15 at 09:47

score 0 · Answer 2 · answered Apr 10 '13 at 15:29

I got this error because one of my scopes was returning self, which I assumed was the relation object (didn't work); returning nil instead achieved the expected result. eg:

scope :except_ids, -> ids do
  if ids.present?
    ids = ids.split(',') if ids.respond_to?(:split)
    where('id not in (?)', ids)
  end
end

if ids.present? returns false, the condition returns nil and the scope has no effect, but is still chainable.

undefined method `default_scoped?' while accessing scope

2 Answers2

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