python - SQLAlchemy: Possible to declare a column as primary key declaratively? -


i have base class mixin:

class mycolumns(object):     id = column(integer)     foo = column(integer)     bar = column(integer)  class mymaintable(mycolumns, base):     __tablename__ = 'main_table'     pk_id = primarykeyconstraint("id")

i want able declare id pk on mymaintable. can't declare pk within mycolumns, because need use mycolumns in table, id not pk (done auditing purposes). when run above code, get

sqlalchemy.exc.argumenterror: mapper mapper|mymaintable|main_table not assemble primary key columns mapped table 'main_table'

is there way add pk declaration way?

i found solution documented here: http://docs.sqlalchemy.org/en/rel_0_9/core/constraints.html#setting-up-constraints-when-using-the-declarative-orm-extension

you need add constraints __table_args__:

class mycolumns(object):     id = column(integer)     foo = column(integer)     bar = column(integer)  class mymaintable(mycolumns, base):     __tablename__ = 'main_table'     __table_args__ = (         primarykeyconstraint("id", name="pk_id"),     )

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