Question

I am learning how to use sqlalchemy and I am developing small app. I am having some issues trying to update data stored in the db using the ORM. I’m not sure what I am missing. The form edit_product.html gets populated with the right data however the return redirect(url_for statement is fired without updating the data. I am using merge(), I tried using add() as suggested by some tutorials, however if I do this I get an error saying that the record already exists.

This is my edit_product function in the views.py:

from database import db_session
@app.route('/product/edit/<int:product_id>', methods=['GET', 'POST'])
def edit_product(product_id):
    product = Product.query.filter(Product.id == product_id).first()
    form = NewOtrosForm(obj=product)
    if request.method == 'POST':
        print request.form
        if form.validate():
            form.populate_obj(product)
            db_session.commit()
        return redirect(url_for('product'))
    else:
        return render_template('edit_product.html', form=form)

This is what I have in my edit form in the jinja2 template:

{% from "_formhelpers.html" import render_field %}
    <form method=post action="">
        <dl>
            {{ render_field(form.name) }}
            {{ render_field(form.price) }}
            {{ render_field(form.description) }}
            {{ render_field(form.provider) }}
            {{ render_field(form.detalles) }}
        </dl>
        <p><input type="submit" value="Save Changes"></p>
    </form>

Answer 1

Can you try to change the below from :

form = NewOtrosForm(obj=product)

to:

form = NewOtrosForm(request.form, obj=product)