add_score_with_decorator.py

from functools import wraps

def validate_json(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        json_data = request.get_json()
        if "exercise_id" not in json_data or "score" not in json_data:
            abort(400)
        return func(*args, **kwargs)
    return wrapper


@app.route("/addscore", methods=["POST"])
@validate_json
def add_score():
    json_data = request.get_json()
    exercise_id = json_data.get("exercise_id")
    score = json_data.get("score")
    model.add_attempt(exercise_id, score)
    return jsonify(dict(result="success"))