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from sqlalchemy import types
from ..primitives import Country
from .scalar_coercible import ScalarCoercible
class CountryType(ScalarCoercible, types.TypeDecorator):
"""
Changes :class:`.Country` objects to a string representation on the way in
and changes them back to :class:`.Country objects on the way out.
In order to use CountryType you need to install Babel_ first.
.. _Babel: https://babel.pocoo.org/
::
from sqlalchemy_utils import CountryType, Country
class User(Base):
__tablename__ = 'user'
id = sa.Column(sa.Integer, autoincrement=True)
name = sa.Column(sa.Unicode(255))
country = sa.Column(CountryType)
user = User()
user.country = Country('FI')
session.add(user)
session.commit()
user.country # Country('FI')
user.country.name # Finland
print user.country # Finland
CountryType is scalar coercible::
user.country = 'US'
user.country # Country('US')
"""
impl = types.String(2)
python_type = Country
cache_ok = True
def process_bind_param(self, value, dialect):
if isinstance(value, Country):
return value.code
if isinstance(value, str):
return value
def process_result_value(self, value, dialect):
if value is not None:
return Country(value)
def _coerce(self, value):
if value is not None and not isinstance(value, Country):
return Country(value)
return value
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