I have a PostgreSQL function discounted_price(packages%ROWTYPE), where 
packages is a table. I would like to add a property on the model 
corresponding 
to the packages table which returns the result of the discounted_price 
function.

Currently I have this which works:

@property
def discounted_price(self):
    return connection.execute('select discounted_price(packages.*) from 
packages '
                                          'where package_id=' + 
str(self.package_id)).first()

But I'd like to call the function with sqlalchemy.sql.func, I'm just unsure 
of how to
pass the packages%ROWTYPE corresponding to the model instance. Something
like this:

@property
def discounted_price(self):
    return connection.query(func.discounted_price(**I don't know what goes 
here**))

Is it possible to do this?

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