42 lines
1.5 KiB
Python
42 lines
1.5 KiB
Python
from django.conf import settings
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from django.core.exceptions import ObjectDoesNotExist, ImproperlyConfigured
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from django.core import validators
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from django.db import backend, connection
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from django.db.models.loading import get_apps, get_app, get_models, get_model, register_models
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from django.db.models.query import Q
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from django.db.models.manager import Manager
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from django.db.models.base import Model, AdminOptions
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from django.db.models.fields import *
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from django.db.models.fields.related import ForeignKey, OneToOneField, ManyToManyField, ManyToOneRel, ManyToManyRel, OneToOneRel, TABULAR, STACKED
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from django.db.models.fields.generic import GenericRelation, GenericRel, GenericForeignKey
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from django.db.models import signals
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from django.utils.functional import curry
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from django.utils.text import capfirst
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# Admin stages.
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ADD, CHANGE, BOTH = 1, 2, 3
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class LazyDate(object):
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"""
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Use in limit_choices_to to compare the field to dates calculated at run time
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instead of when the model is loaded. For example::
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... limit_choices_to = {'date__gt' : models.LazyDate(days=-3)} ...
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which will limit the choices to dates greater than three days ago.
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"""
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def __init__(self, **kwargs):
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self.delta = datetime.timedelta(**kwargs)
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def __str__(self):
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return str(self.__get_value__())
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def __repr__(self):
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return "<LazyDate: %s>" % self.delta
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def __get_value__(self):
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return datetime.datetime.now() + self.delta
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def __getattr__(self, attr):
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return getattr(self.__get_value__(), attr)
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