Rails - Mar 2010 - Frozen hash problem

I''d like to delete some records before saving them.  I ran this
experiment:

before_save :prune_lab_datas

  def prune_lab_datas
    lab_datas.each do |lab_data|
      lab_data.destroy
    end
    raise lab_datas.to_yaml
  end

But nothing seems to be deleted in the hash:

---
- &id001 !ruby/object:LabData
  attributes:
    created_at: 2010-03-21 22:16:06
    unit_id: "3"
    lab_id: "81"
    updated_at: 2010-03-21 22:16:06
    id: "184"
    lab_desc_id: "6"
    value: "29"
  attributes_cache: {}

  changed_attributes: {}

  errors: !ruby/object:ActiveRecord::Errors
    base: *id001
    errors: {}

And if I remove the "raise", the controller throws a
"can''t modify
frozen hash" error.

Any idea how I can remove records from the hash prior to saving?

TIA,
Craig

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