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import json
from django import forms
from django.core.exceptions import ValidationError
from django.utils import six
from django.utils.translation import ugettext_lazy as _
__all__ = ['HStoreField']
class HStoreField(forms.CharField):
"""A field for HStore data which accepts JSON input."""
widget = forms.Textarea
default_error_messages = {
'invalid_json': _('Could not load JSON data.'),
}
def prepare_value(self, value):
if isinstance(value, dict):
return json.dumps(value)
return value
def to_python(self, value):
if not value:
return {}
try:
value = json.loads(value)
except ValueError:
raise ValidationError(
self.error_messages['invalid_json'],
code='invalid_json',
)
# Cast everything to strings for ease.
for key, val in value.items():
value[key] = six.text_type(val)
return value
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