sqlalchemy.orm.util identity_key Example Code

identity_key is a callable within the sqlalchemy.orm.util module of the SQLAlchemy project.

AliasedClass and AliasedInsp are a couple of other callables within the sqlalchemy.orm.util package that also have code examples.

Example 1 from WTForms-Alchemy

wtforms-alchemy (documentation and PyPI package information) is a WTForms extension toolkit for easier creation of SQLAlchemy model based forms. While this project primarily focuses on proper form handling, it also has many good examples of how to use various parts of SQLAlchemy in its code base. The project is provided as open source under the MIT license.

WTForms-Alchemy / wtforms_alchemy / fields.py

# fields.py
from __future__ import unicode_literals

import operator
from itertools import groupby

import six
from sqlalchemy.orm.util import identity_key
from sqlalchemy_utils import Country, i18n, PhoneNumber
from sqlalchemy_utils.primitives import WeekDay, WeekDays
from wtforms import widgets
from wtforms.compat import string_types, text_type
from wtforms.fields import FieldList, FormField, SelectFieldBase
from wtforms.validators import ValidationError
from wtforms.widgets import CheckboxInput, ListWidget
from wtforms_components import SelectField, SelectMultipleField
from wtforms_components.fields.html5 import StringField
from wtforms_components.widgets import SelectWidget, TelInput

from .utils import find_entity

try:
    from wtforms.utils import unset_value as _unset_value
except ImportError:
    from wtforms.fields import _unset_value


class SkipOperation(Exception):
    pass


class ModelFormField(FormField):


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



    def _set_data(self, data):
        self._data = data
        self._formdata = None

    data = property(_get_data, _set_data)

    def iter_choices(self):
        for pk, obj in self._get_object_list():
            yield (pk, self.get_label(obj), obj in self.data)

    def process_formdata(self, valuelist):
        self._formdata = set(valuelist)

    def pre_validate(self, form):
        if self._invalid_formdata:
            raise ValidationError(self.gettext('Not a valid choice'))
        elif self.data:
            obj_list = list(x[1] for x in self._get_object_list())
            for v in self.data:
                if v not in obj_list:
                    raise ValidationError(self.gettext('Not a valid choice'))


def get_pk_from_identity(obj):
    cls, key = identity_key(instance=obj)[0:2]
    return ':'.join(text_type(x) for x in key)


class GroupedQuerySelectField(SelectField):
    widget = SelectWidget()

    def __init__(
        self,
        label=None,
        validators=None,
        query_factory=None,
        get_pk=None,
        get_label=None,
        get_group=None,
        allow_blank=False,
        blank_text='',
        blank_value='__None',
        **kwargs
    ):
        super(GroupedQuerySelectField, self).__init__(
            label,
            validators,
            coerce=lambda x: x,
            **kwargs


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

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