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fields.py
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fields.py
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# -*- coding: utf-8 -*-
import json
from django import forms
from django.core.exceptions import ValidationError
from django.core.serializers.json import DjangoJSONEncoder
from django.db import models
from django.utils import six
from django.utils.encoding import force_text
from django.utils.translation import ugettext_lazy as _
TYPES = {
'int': int,
'smallint': int,
'bigint': int,
'text': str,
'double precision': float,
'varchar': str,
}
def _cast_to_unicode(data):
if isinstance(data, (list, tuple)):
return [_cast_to_unicode(x) for x in data]
elif isinstance(data, str):
return force_text(data)
return data
def _cast_to_type(data, type_cast):
if isinstance(data, (list, tuple)):
return [_cast_to_type(x, type_cast) for x in data]
if type_cast == str:
return force_text(data)
return type_cast(data)
def _unserialize(value):
if not isinstance(value, six.string_types):
return _cast_to_unicode(value)
try:
return _cast_to_unicode(json.loads(value))
except ValueError:
return _cast_to_unicode(value)
class ArrayField(models.Field):
__metaclass__ = models.SubfieldBase
def __init__(self, *args, **kwargs):
self._array_type = kwargs.pop('dbtype', 'int')
type_key = self._array_type.split('(')[0]
if "type_cast" in kwargs:
self._type_cast = kwargs.pop("type_cast")
elif type_key in TYPES:
self._type_cast = TYPES[type_key]
else:
self._type_cast = lambda x: x
self._dimension = kwargs.pop('dimension', 1)
kwargs.setdefault('blank', True)
kwargs.setdefault('null', True)
kwargs.setdefault('default', None)
super(ArrayField, self).__init__(*args, **kwargs)
def formfield(self, **params):
params.setdefault('form_class', ArrayFormField)
return super(ArrayField, self).formfield(**params)
def db_type(self, connection):
return '{0}{1}'.format(self._array_type, "[]" * self._dimension)
def get_db_prep_value(self, value, connection, prepared=False):
value = value if prepared else self.get_prep_value(value)
if not value or isinstance(value, six.string_types):
return value
return _cast_to_type(value, self._type_cast)
def get_prep_value(self, value):
return value
def to_python(self, value):
return _unserialize(value)
def value_to_string(self, obj):
value = self._get_val_from_obj(obj)
return json.dumps(self.get_prep_value(value),
cls=DjangoJSONEncoder)
def validate(self, value, model_instance):
for val in value:
super(ArrayField, self).validate(val, model_instance)
# South support
try:
from south.modelsinspector import add_introspection_rules
add_introspection_rules([
(
[ArrayField], # class
[], # positional params
{
"dbtype": ["_array_type", {"default": "int"}],
"dimension": ["_dimension", {"default": 1}],
}
)
], ['^djorm_pgarray\.fields\.ArrayField'])
except ImportError:
pass
class ArrayFormField(forms.Field):
default_error_messages = {
'invalid': _('Enter a list of values, joined by commas. E.g. "a,b,c".'),
}
def __init__(
self, max_length=None, min_length=None, delim=None,
*args, **kwargs):
if delim is not None:
self.delim = delim
else:
self.delim = ','
super(ArrayFormField, self).__init__(*args, **kwargs)
def clean(self, value):
if not value:
return []
# If Django already parsed value to list
if isinstance(value, list):
return value
try:
return value.split(self.delim)
except Exception:
raise ValidationError(self.error_messages['invalid'])
def prepare_value(self, value):
if value:
return self.delim.join(str(v) for v in value)
else:
return super(ArrayFormField, self).prepare_value(value)
def to_python(self, value):
return value.split(self.delim)