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from ipaddress import ip_address
from sqlalchemy import types
from .scalar_coercible import ScalarCoercible
class IPAddressType(ScalarCoercible, types.TypeDecorator):
"""
Changes IPAddress objects to a string representation on the way in and
changes them back to IPAddress objects on the way out.
::
from sqlalchemy_utils import IPAddressType
class User(Base):
__tablename__ = 'user'
id = sa.Column(sa.Integer, autoincrement=True)
name = sa.Column(sa.Unicode(255))
ip_address = sa.Column(IPAddressType)
user = User()
user.ip_address = '123.123.123.123'
session.add(user)
session.commit()
user.ip_address # IPAddress object
"""
impl = types.Unicode(50)
cache_ok = True
def __init__(self, max_length=50, *args, **kwargs):
super().__init__(*args, **kwargs)
self.impl = types.Unicode(max_length)
def process_bind_param(self, value, dialect):
return str(value) if value else None
def process_result_value(self, value, dialect):
return ip_address(value) if value else None
def _coerce(self, value):
return ip_address(value) if value else None
@property
def python_type(self):
return self.impl.type.python_type
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