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Flask - how do I combine Flask-WTF and Flask-SQLAlchemy to edit db models

@app.route('/person/edit/<id>/', methods=['GET', 'POST'])
def edit_person(id):
    person = Person.query.get_or_404(id)
    form = PersonForm(obj=person)
    if form.validate_on_submit():
        form.populate_obj(person)

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Flask - how do I combine Flask-WTF and Flask-SQLAlchemy to edit db models

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