Default value with primary key sqlalchemy

Question

I've the following class

class Comision(Base):
    __tablename__ = 'comision'

    id = Column(Integer, primary_key=True)
    key = Column(Integer, default=process())

in the column key i've the def process and i need to make some operations with the primary key of that table, it is possible to pass it like argument?

Answer 1

Try

key = Column(Integer, default=process)

or

key = Column(Integer, default=lambda:process())

Defined as key = Column(Integer, default=process()), process() is called once only when class Comision is defined.

Take a look at Context-Sensitive Default Functions in http://docs.sqlalchemy.org/en/rel_0_8/core/defaults.html for more detail.