getting data from wtforms FormField in a Flask route

Question

I have a problem getting data from a form using it in a route

forms.py

class Calculator(Form):
    amount = IntegerField('Amount')
    weight = IntegerField('Weight')

class Program(Form):
    cycles = IntegerField('Cycles')
    volume = FormField(Calculator)

app.py

@app.route('/', methods=('GET', 'POST'))
def index():
    form = forms.Program()
    if form.validate_on_submit():
        values = models.Progression(
            cycles=form.cycles.data,
            amount=form.amount.data,
            weight=form.weight.data
        )
    return render_template('index.html', form=form, values=values)

The data for cycles comes through just fine but I am unsure of the syntax for how to access the encapsulated form within my route. The docs say FormField will return the data dict of the enclosed form but I can't seem to figure out how to grab that and put it in a variable.

Sorry, I accidentally posted before I finished the question. — gscr
– gscr, Commented Apr 13, 2016 at 4:42

gscr · Accepted Answer · 2016-04-14 01:06:02Z

2

I was able to grab the data I needed using

    amount=form.volume.amount.data,
    weight=form.volume.weight.data

The real issue came from the fact that the form was not validating when I was using FormField. A rookie error I should have checked earlier. I had to enable CSRF protection by importing it from flask_wtf and using CsrfProtect(app)

answered Apr 14, 2016 at 1:06

gscr

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Comments

wgwz · Accepted Answer · 2016-04-13 16:24:27Z

0

The problem is that the form data does not come through as the attributes of the Calculator class. The data is sent as a dictionary from the volume attribute.

Test it out with: print form.volume.data

(I suggest commenting out your values object and just use print statements)

The output should be: {'amount': foo, 'weight': bar}

Thanks for teaching me something! I never knew of FormField.

answered Apr 13, 2016 at 16:24

wgwz

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1 Comment

gscr Over a year ago

Thanks for that testing tip. It is what lead me to the real cause of my issue.

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