Nested forms (FormFields) doesn’t get populated with data when I use WTForms-JSON. I can’t spot my mistake, see example below.
from flask import Flask, request, jsonify
from flask_wtf import Form
from wtforms import TextField, FormField, IntegerField
from wtforms.validators import InputRequired
import wtforms_json
app = Flask(__name__)
app.config["WTF_CSRF_ENABLED"] = False
wtforms_json.init()
class Address(Form):
street = TextField('street', validators=[InputRequired()])
number = IntegerField('number', validators=[InputRequired()])
class User(Form):
name = TextField('name', validators=[InputRequired()])
address = FormField(Address, label='address')
@app.route('/', methods=['POST'])
def why_no_work():
form = User()
form.from_json(request.json)
print form.data
if form.validate():
return jsonify(success='YEAH')
else:
return jsonify(errors=form.errors)
if __name__ == '__main__':
app.run(debug=True)
I send the following JSON-request
{
"name": "Alex",
"address": {
"street": "Plz Work Street",
"number": 1337
}
}
but the print after form.from_json(request.json) reveals that the address object is never populated with data (also, the “appropriate” errors are returned from the route).
Print output:
{'name': u'Alex', 'address': {'street': u'', 'number': None}}
I’m using WTForms 2.0.2, WTForms-JSON 0.2.8
Is this a bug or am I doing something wrong? Thankful for any help!
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Answer
I was using the from_json()-function wrong, as it is a class-function that returns an instantiated form. See updated code for route below.
@app.route('/', methods=['POST'])
def why_no_work():
form = User.from_json(request.json) # <-- This line right here
if form.validate():
return jsonify(success='YEAH')
else:
return jsonify(errors=form.errors)