sqlalchemy.ext.hybrid hybrid_property Example Code

hybrid_property is a callable within the sqlalchemy.ext.hybrid 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 / i18n.py

# i18n.py
import inspect

import six
import sqlalchemy as sa
from sqlalchemy.ext.compiler import compiles
from sqlalchemy.ext.hybrid import hybrid_property
from sqlalchemy.sql.expression import ColumnElement

from .exceptions import ImproperlyConfigured

try:
    import babel
    import babel.dates
except ImportError:
    babel = None


def get_locale():
    try:
        return babel.Locale('en')
    except AttributeError:
        raise ImproperlyConfigured(
            'Could not load get_locale function using Babel. Either '
            'install Babel or make a similar function and override it '
            'in this module.'
        )


if six.PY2:
    def get_args_count(func):


## ... source file abbreviated to get to hybrid_property examples ...


                    return getattr(obj, attr.key)[default_locale]
                except (TypeError, KeyError):
                    return self.default_value
        return getter

    def setter_factory(self, attr):
        def setter(obj, value):
            if getattr(obj, attr.key) is None:
                setattr(obj, attr.key, {})
            locale = cast_locale(obj, self.current_locale, attr)
            getattr(obj, attr.key)[locale] = value
        return setter

    def expr_factory(self, attr):
        def expr(cls):
            cls_attr = getattr(cls, attr.key)
            current_locale = cast_locale_expr(cls, self.current_locale, attr)
            default_locale = cast_locale_expr(cls, self.default_locale, attr)
            return sa.func.coalesce(
                cls_attr[current_locale],
                cls_attr[default_locale]
            )
        return expr

    def __call__(self, attr):
        return hybrid_property(
            fget=self.getter_factory(attr),
            fset=self.setter_factory(attr),
            expr=self.expr_factory(attr)
        )



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

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