It's easy to fetch extra object attributes with extra(select={...}).
But how can I obtain extra sub-objects (easily, without resorting to
custom SQL)?
I'd like to be able to do something like the following, but obviously
this doesn't work:
extra(select={'country': 'SELECT book_country.name,
book_country.code'})
What works is:
extra(select={'country_name': 'SELECT book_country.name'},
'country_code': 'SELECT book_country.code'})
but when you add the (omitted) FROM and WHERE clause, it's suddenly
quite verbose.
JJ.
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