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import json
from django import forms
from django.utils import six
from django.utils.translation import ugettext_lazy as _
__all__ = ['JSONField']
class InvalidJSONInput(six.text_type):
pass
class JSONField(forms.CharField):
default_error_messages = {
'invalid': _("'%(value)s' value must be valid JSON."),
}
def __init__(self, **kwargs):
kwargs.setdefault('widget', forms.Textarea)
super(JSONField, self).__init__(**kwargs)
def to_python(self, value):
if self.disabled:
return value
if value in self.empty_values:
return None
try:
return json.loads(value)
except ValueError:
raise forms.ValidationError(
self.error_messages['invalid'],
code='invalid',
params={'value': value},
)
def bound_data(self, data, initial):
if self.disabled:
return initial
try:
return json.loads(data)
except ValueError:
return InvalidJSONInput(data)
def prepare_value(self, value):
if isinstance(value, InvalidJSONInput):
return value
return json.dumps(value)
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