sqlalchemy-ext-mutable-mutable.markdown

title: sqlalchemy.ext.mutable Mutable Example Code category: page slug: sqlalchemy-ext-mutable-mutable-examples sortorder: 500031052 toc: False sidebartitle: sqlalchemy.ext.mutable Mutable meta: Example code for understanding how to use the Mutable class from the sqlalchemy.ext.mutable module of the SQLAlchemy project.

Mutable is a class within the sqlalchemy.ext.mutable module of the SQLAlchemy project.

Example 1 from sqlalchemy-utils

sqlalchemy-utils (project documentation and PyPI package information) is a code library with various helper functions and new data types that make it easier to use SQLAlchemy when building projects that involve more specific storage requirements such as currency. The wide array of data types includes ranged values and aggregated attributes.

sqlalchemy-utils / sqlalchemy_utils / types / password.py

# password.py
import weakref

import six
from sqlalchemy import types
from sqlalchemy.dialects import oracle, postgresql, sqlite
~~from sqlalchemy.ext.mutable import Mutable

from ..exceptions import ImproperlyConfigured
from .scalar_coercible import ScalarCoercible

passlib = None
try:
    import passlib
    from passlib.context import LazyCryptContext
except ImportError:
    pass


~~class Password(Mutable, object):

    @classmethod
    def coerce(cls, key, value):
        if isinstance(value, Password):
            return value

        if isinstance(value, (six.string_types, six.binary_type)):
            return cls(value, secret=True)

        super(Password, cls).coerce(key, value)

    def __init__(self, value, context=None, secret=False):
        self.hash = value if not secret else None

        self.secret = value if secret else None

        if isinstance(self.hash, six.text_type):
            self.hash = self.hash.encode('utf8')

        self.context = weakref.proxy(context) if context is not None else None

    def __eq__(self, value):
        if self.hash is None or value is None:
            return self.hash is value


## ... source file continues with no further Mutable examples...