root / snf-django-lib / snf_django / lib / db / fields.py @ b052f360
History | View | Annotate | Download (3.2 kB)
1 |
# Copyright 2013 GRNET S.A. All rights reserved.
|
---|---|
2 |
#
|
3 |
# Redistribution and use in source and binary forms, with or
|
4 |
# without modification, are permitted provided that the following
|
5 |
# conditions are met:
|
6 |
#
|
7 |
# 1. Redistributions of source code must retain the above
|
8 |
# copyright notice, this list of conditions and the following
|
9 |
# disclaimer.
|
10 |
#
|
11 |
# 2. Redistributions in binary form must reproduce the above
|
12 |
# copyright notice, this list of conditions and the following
|
13 |
# disclaimer in the documentation and/or other materials
|
14 |
# provided with the distribution.
|
15 |
#
|
16 |
# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
|
17 |
# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
18 |
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
19 |
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
|
20 |
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
21 |
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
22 |
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
23 |
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
24 |
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
25 |
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
26 |
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
27 |
# POSSIBILITY OF SUCH DAMAGE.
|
28 |
#
|
29 |
# The views and conclusions contained in the software and
|
30 |
# documentation are those of the authors and should not be
|
31 |
# interpreted as representing official policies, either expressed
|
32 |
# or implied, of GRNET S.A.
|
33 |
|
34 |
from django.core import exceptions |
35 |
from django.db.models import DecimalField, SubfieldBase |
36 |
from django.utils.translation import ugettext_lazy as _ |
37 |
from south.modelsinspector import add_introspection_rules |
38 |
import decimal |
39 |
|
40 |
DECIMAL_DIGITS = 38
|
41 |
|
42 |
|
43 |
class IntDecimalField(DecimalField): |
44 |
|
45 |
__metaclass__ = SubfieldBase |
46 |
|
47 |
description = _("Integer number as decimal")
|
48 |
|
49 |
def to_python(self, value): |
50 |
if value is None: |
51 |
return value
|
52 |
try:
|
53 |
return long(value) |
54 |
except (ValueError, TypeError): |
55 |
raise exceptions.ValidationError(self.error_messages['invalid']) |
56 |
|
57 |
def _to_decimal(self, value): |
58 |
if value is None: |
59 |
return value
|
60 |
try:
|
61 |
return decimal.Decimal(value)
|
62 |
except decimal.InvalidOperation:
|
63 |
raise exceptions.ValidationError(self.error_messages['invalid']) |
64 |
|
65 |
def get_db_prep_save(self, value, connection): |
66 |
return connection.ops.value_to_db_decimal(
|
67 |
self._to_decimal(value), self.max_digits, self.decimal_places) |
68 |
|
69 |
def get_prep_value(self, value): |
70 |
return self._to_decimal(value) |
71 |
|
72 |
def formfield(self, **kwargs): |
73 |
defaults = {'form_class': forms.IntegerField}
|
74 |
defaults.update(kwargs) |
75 |
return super(IntegerField, self).formfield(**defaults) |
76 |
|
77 |
add_introspection_rules( |
78 |
[], ["^snf_django\.lib\.db\.fields\.IntDecimalField"])
|
79 |
|
80 |
|
81 |
def intDecimalField(verbose_name=None, name=None, **kwargs): |
82 |
# decimal_places is set here instead of the object constructor
|
83 |
# in order to convince south
|
84 |
return IntDecimalField(verbose_name, name,
|
85 |
max_digits=DECIMAL_DIGITS, decimal_places=0,
|
86 |
**kwargs) |