Given the User-Addresses schema as in the docs, I need to select all users
along with only those email addresses which end with "@gmail.com".
The question is how do I group these filtered emails by user?
Apparently I can use `contains_eager` to write something like this:
session.query(User).outerjoin(User.addresses).filter(Address.email_address.like('%@gmail.com'))\
.options(contains_eager(User.addresses))
But having the filtered email addresses on the `addresses` attribute is
rather confusing.
I'd like to either:
1. iterate a query results in a clear way:
for user, gmail_addrs in session.query(???)
2. get the filtered children attached to a different field (smth like
`contains_eager(User.addresses, attach_to='_gmail_addrs')`)
Thanks.
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