[Rails] NULL value in CSV fixture, howto?

I am preparing some seed data for a deployment from generated a CSV
file. However, one of the model's columns ( child_id) needs to have a
null value in on a few of the rows where there is no Child instance.
Whatever I have put in there, it seems to just come in as a zero.

I have tried several combinations since I cannot find this documented
anywhere.

column1, child_id, column2
a,,b gives |a|0|b|
a, null, b gives |a|0|b|
a, "", b gives |a|0|b|
a, nil, b gives |a|0|b

Any ideas?

Thanks.

O.

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