filters.py

"""
The MIT License (MIT)

Copyright (c) <2013> <David Medina>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
"""

from django import forms
from django.utils.encoding import force_str
from django.utils.dateparse import parse_datetime

import django_filters
from rest_framework import ISO_8601


class IsoDateTimeField(forms.DateTimeField):
    """
    It support 'iso-8601' date format too which is out the scope of
    the ``datetime.strptime`` standard library

    # ISO 8601: ``http://www.w3.org/TR/NOTE-datetime``
    """
    def strptime(self, value, format):
        value = force_str(value)
        if format == ISO_8601:
            parsed = parse_datetime(value)
            if parsed is None:  # Continue with other formats if doesn't match
                raise ValueError
            return parsed
        return super(IsoDateTimeField, self).strptime(value, format)


class PreciseDateTimeField(IsoDateTimeField):
    """ Only support ISO 8601 """
    def __init__(self, *args, **kwargs):
        kwargs['input_formats'] = (ISO_8601, )
        super(PreciseDateTimeField, self).__init__(*args, **kwargs)


class IsoDateTimeFilter(django_filters.DateTimeFilter):
    """ Extend ``DateTimeFilter`` to filter by ISO 8601 formated dates too"""
    field_class = IsoDateTimeField


class PreciseDateTimeFilter(django_filters.DateTimeFilter):
    """ Extend ``DateTimeFilter`` to filter only by ISO 8601 formated dates """
    field_class = PreciseDateTimeField

sample.py

import django_filters

from rest_framework import ISO_8601

from thisgist.filters import IsoDateTimeField


class User(django_filters.FilterSet):
    min_date = IsoDateTimeField(source='date_joined', lookup_type='gte',
                                input_formats=(ISO_8601, '%m/%d/%Y %H:%M:%S'))

# With the apropiated RestView we could do hard or light filtering

# GET /resource/?min_date=2006-10-25T14:30:59.000000Z HTTP/1.1
# GET /resource/?min_date=10/25/2006%2014:30 HTTP/1.1

Should https://gist.github.com/Nitron/b9e2fc4eff0b13ffa573#file-sample-py-L9 be:

min_date = IsoDateTimeFilter(source='date_joined', lookup_type='gte',
                                input_formats=(ISO_8601, '%m/%d/%Y %H:%M:%S'))

i.e. IsoDateTimeField -> IsoDateTimeFilter?