How to disable default_scope for a belongs_to?

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Is there a way to disable the default_scope for a single belongs_to association? The default_scope is fine for all but a single belongs_to that I would like to bypass the scope. I'm familiar with with_exclusive_scope however I don't think that can be used with belongs_to.

Any suggestions?

Context: I'm trying to allow the branch_source association in acts_as_revisable to point to a revision that is not the latest (revisable_is_current is false).

4 Answers

Just had this problem myself, and here's what I came up with:

class Comment < ActiveRecord::Base
  belongs_to :document # Document has some kind of default scope
                       # that stops us from finding it

  # Override getter method for document association
  def document_with_unscoped
    # Fetch document with default scope disabled
    Document.unscoped { document_without_unscoped }
  end
  alias_method_chain :document, :unscoped
end

I removed this

belongs_to :document

and replaced it with

def document
    Document.unscope(where: :deleted_at).find_by(id: document_id)
end

def document=(d)
    self.document_id = d&.id
end
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