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pythonflaskflask-wtformswtforms

WTForms TimeField default value

I making an edit form using WTForms.

Now I want to make a default value that prepopulated from database in the TimeField form.

enter image description here

Here is the snippet of the code on the form above:

from wtforms.fields.html5 import TimeField

class ScheduleForm(Form):
    start_at = TimeField('Start at',validators=[required()])
    end_at = TimeField('End at', validators=[required()])
    # ...
    # ...

I try to call the obj argument on the route that I called the form like this:

@app.route('/edit_schedule/<int:schedule_id>', methods=['GET', 'POST'])
def edit_schedule(schedule_id):
    schedule = Schedule.query.filter_by(id=schedule_id).first()

    print(schedule.start_at) # I got the value from database here
    print(schedule.end_at) # I got the value from database here

    form = ScheduleForm(obj=schedule) # call the obj argument

But the value on that field still didn't prepopulate, and then I try to make default value like this:

form = ScheduleForm(obj=schedule)
form.end_at.default = schedule.start_at
form.end_at.default = schedule.end_at

still didn't work, then I tried to add this line on the bellow the default value that I set above:

form.process()

Still didn't work, then I try to use lambda:

form.start_at.default = lambda: db.session.query(Schedule.start_at).filter_by(id=schedule.id).first()
form.end_at.default = lambda: db.session.query(Schedule.end_at).filter_by(id=schedule.id).first()

No one on all of the ways above works.

So the point of my question is, how to set or prepopulate the default value on the TimeField..?

EDIT: here is the snippet of my model code:

class Schedule(db.Model):
    __tablename__ = 'schedule'
    id = db.Column(db.Integer, primary_key=True)
    start_at = db.Column(db.Time())
    end_at = db.Column(db.Time())
Solution

  • I figured out this by set default value on my template, like the line below:

    {{ f.render_field(form.start_at, value=schedule.start_at) }}
{{ f.render_field(form.end_at, value=schedule.end_at) }}