Rails - Dec 2006 - ActiveRecord: querying children

I have a parent with has_many children. The children have a column
''blah''. IF I do the following:

    parent.children.find_by_blah(42)

The sql exectued is:

    select * from blah where parent_id = 1 and blah = 42
    select * from blah where parent_id = 1

The first line of sql is what I want. The second appears to be
ActiveRecord loading up all of parent.children. This I don''t want b/c
children is huge.

How do I avoid that and use idiomatic ActiveRecord?

thanks


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