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Turn URL variables into models.

Project description

Dart turns URL variables into database models with a decorator.

That means you can do something like this:

@app.route('/user/<user_id>/tracks', methods=['GET'])
@dart.inject(User, 'user', from_var='user_id')
def user_tracks(user=None):
    return jsonify(user.tracks)

If you’re smart, you might have a decorator that checks user authorization, something like @login_required. You can compose Dart with other decorators to simplify logic, while still keeping your code readable and concise:

def login_required(view):
    @functools.wraps(view)
    @dart.inject(User, 'user', from_var='user_id')
    @dart.inject(User, 'current_user', from_val=lambda: session['user_id'])
    def decorated_view(user=None, current_user=None, *args, **kwargs):
        if current_user != user:
            abort(403)
        else:
            return view(user=user, *args, **kwargs)
    return decorated_view

@login_required
def view(user=None):
    return '{} did it!'.format(user.name)

Of course, Dart isn’t just a Flask. It’s literally just a decorator that takes a keyword arg or lambda expression and queries the model class using it as the primary key. That means you can use the Dart decorator with any function.

For more info, check out the source code – it’s 27 lines.

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