Rails - Apr 2007 - Can't replace/remove a has_one related object

All,

I have two models, Job and Document.

Job has_one :document

I perform this:

@current_job.document.destroy

which successfully removes all the appopriate DB records.

However, if I attempt to do:

  @current_job.document = nil

OR

  @current_job.build_document(...)

I get a TypeError: can''t modify frozen hash exception.

Why can''t I reassign nil to the associated document for my job?

Thanks,
Wes

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OK, I see now that the destroy instance method says that it "freezes 
this instance to reflect that no changes should be made (since they 
can‘t be persisted)."

Fine.  I don''t want to work with that instance any more.

Why can''t I reassign to the has_one relationship?

Wes

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