how to make a column unique in flask sqlalchemy code example
Example: sqlalchemy unique pair of columns
mytable = Table('mytable', meta,
Column('customer_id', Integer, ForeignKey('customers.customer_id')),
Column('location_code', Unicode(10)),
UniqueConstraint('customer_id', 'location_code', name='uix_1')
)
Index('myindex', mytable.c.customer_id, mytable.c.location_code, unique=True)
class Location(Base):
__tablename__ = 'locations'
id = Column(Integer, primary_key = True)
customer_id = Column(Integer, ForeignKey('customers.customer_id'), nullable=False)
location_code = Column(Unicode(10), nullable=False)
__table_args__ = (UniqueConstraint('customer_id', 'location_code', name='_customer_location_uc'),
)