Hi All,
using 8.1
class Company(Base):
__tablename__ = 'Company'
Id = Column(Integer, primary_key=True)
class ProductClass(Base):
__tablename__ = 'ProductClass'
Id = Column(Integer, primary_key=True)
Company_Id = Column(Integer, ForeignKey(Company.Id,
this depends on the database you're using, and I'd google around for stack
overflow information on how to implement unique values with NULLs allowed. For
example here is postgresql:
http://dba.stackexchange.com/questions/9759/postgresql-multi-column-unique-constraint-and-null-values
and
