如何禁用所属对象的默认范围?

可能有点晚了(短短3年),但遇到了同样的问题,Tobias的解决方案当然是正确的方向,但Rails 3.2+可以简化。我唯一仍然不喜欢的是文档的“硬编码”类名,也许可以使用反射来改变。。。

无论如何,这就是我想到的:

class Comment < ActiveRecord::Base
  # Document has some kind of default_scope
  belongs_to :document

  # Ensure document is not scoped, because Rails 3.2 uses modules it's
  # possible to use simple inheritance.
  def document
    Document.unscoped { super }
  end
end

使现代化 :获得基于reflect_on_关联的通用解决方案 https://gist.github.com/2923336

belongs_to :account, -> { unscope(where: :destroyed_at) }

我自己也有这个问题,下面是我的想法:

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

belongs_to :document

并将其替换为

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

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