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"""
marvin.fields
~~~~~~~~~~~~~~~~~
Some custom form field types used by marvin.
"""
from wtforms import widgets
from wtforms.fields import Field
import ujson as json
class JSONField(Field):
""" A field that validates and processes JSON input. """
widget = widgets.TextInput()
def process_formdata(self, valuelist):
29 if valuelist:
try:
self.data = json.loads(valuelist[0])
# don't accept anything else than javascript objects (like lists, strings, etc)
if not isinstance(self.data, dict):
raise ValueError
except ValueError:
self.data = None
raise ValueError('Not valid JSON.')
else:
self.data = None
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