meta.py

from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.schema import MetaData

# Recommended naming convention used by Alembic, as various different database
# providers will autogenerate vastly different names making migrations more
# difficult. See: http://alembic.zzzcomputing.com/en/latest/naming.html
NAMING_CONVENTION = {
    "ix": "ix_%(column_0_label)s",
    "uq": "uq_%(table_name)s_%(column_0_name)s",
    "ck": "ck_%(table_name)s_%(constraint_name)s",
    "fk": "fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s",
    "pk": "pk_%(table_name)s"
}

metadata = MetaData(naming_convention=NAMING_CONVENTION)
Base = declarative_base(metadata=metadata)


class CommonModel(object):
    def to_dict(self):
        values = {}
        for column in self.__table__.columns:
            values[column.name] = getattr(self, column.name)
        return values

    def to_dict_without_none(self):
        values = {}
        for column in self.__table__.columns:
            val = getattr(self, column.name)
            if val is not None:
                values[column.name] = val
        return values