vote.py

@app.route('/api/service/<product_id>/vote/<any(up,down):direction>')
@xhr_required
@login_required
def api_service_vote(product_id, direction):
    ''' thi api need for vote up/down the services'''

    product = Product.query.get_or_404(product_id)
    query = Product_Vote.query.filter(Product_Vote.voter_id == g.user.id,
                                      Product_Vote.product_id == product.id)

    if db.session.query(query.exists()).scalar():
        raise APIError('You already vote')

    if direction == 'up':
        product.votes = Product.votes + 1
    else:
        product.votes = Product.votes - 1

    vote = Product_Vote(
        product_id=product.id,
        voter_id=g.user.id,
        up=direction == 'up',
        down=direction == 'down'
    )
    db.session.add(vote)
    db.session.add(product)
    db.session.commit()
    return json.jsonify()