sqlalchemy.orm.attributes InstrumentedAttribute Example Code

InstrumentedAttribute is a class within the sqlalchemy.orm.attributes 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 / path.py

# path.py
import sqlalchemy as sa
from sqlalchemy.orm.attributes import InstrumentedAttribute
from sqlalchemy.util.langhelpers import symbol

from .utils import str_coercible


@str_coercible
class Path(object):
    def __init__(self, path, separator='.'):
        if isinstance(path, Path):
            self.path = path.path
        else:
            self.path = path
        self.separator = separator

    @property
    def parts(self):
        return self.path.split(self.separator)

    def __iter__(self):
        for part in self.parts:
            yield part

    def __len__(self):
        return len(self.parts)


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


        return "%s('%s')" % (self.__class__.__name__, self.path)

    def index(self, element):
        return self.parts.index(element)

    def __getitem__(self, slice):
        result = self.parts[slice]
        if isinstance(result, list):
            return self.__class__(
                self.separator.join(result),
                separator=self.separator
            )
        return result

    def __eq__(self, other):
        return self.path == other.path and self.separator == other.separator

    def __ne__(self, other):
        return not (self == other)

    def __unicode__(self):
        return self.path


def get_attr(mixed, attr):
    if isinstance(mixed, InstrumentedAttribute):
        return getattr(
            mixed.property.mapper.class_,
            attr
        )
    else:
        return getattr(mixed, attr)


@str_coercible
class AttrPath(object):
    def __init__(self, class_, path):
        self.class_ = class_
        self.path = Path(path)
        self.parts = []
        last_attr = class_
        for value in self.path:
            last_attr = get_attr(last_attr, value)
            self.parts.append(last_attr)

    def __iter__(self):
        for part in self.parts:
            yield part

    def __invert__(self):


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

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