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import json
from wtforms import fields, widgets
class JSONField(fields.StringField):
"""
A text field which stores a `json`.
"""
widget = widgets.TextArea()
def _value(self):
return json.dumps(self.data) if self.data else ""
def process_formdata(self, valuelist):
if valuelist:
try:
self.data = json.loads(valuelist[0])
except ValueError:
self.data = None
raise ValueError("This field contains invalid JSON")
else:
self.data = None
def pre_validate(self, form):
if self.data:
try:
json.dumps(self.data)
except TypeError:
self.data = None
raise ValueError("This field contains invalid JSON")
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