Error with params using python neo4j driver and flask app

Hello, I'm newbie here

I'm trying to write a little web app with neo4j 4.0 python 3.8 and flask.
I followed the doc here https://neo4j.com/docs/driver-manual/current/session-api/simple/#driver-simple-transaction-fn

when I execute my python code directly in the python shell I get the expected result
when I execute it from the web page I get the error **TypeError: The view function did not return a valid response. The function either returned None or ended without a return statement.
**

My code is very simple :

def search_news_by_name(tx, name):
	query = """
		MATCH (n:News {Symbol: $name}) 
		RETURN n.Date, n.Symbol, n.Title 
		ORDER BY n.Date DESC
		LIMIT 25
		"""
	print(query, name, (tx.run(query, name=name)).__dict__)
	newsList = []
	for news in tx.run(query, name=name):
		newsList.append({'Date': news['n.Date'],'Symbol': news['n.Symbol'],'Title': news['n.Title']})
	return newsList		

def search_query(name):
	name='UBI'
	driver = GraphDatabase.driver("neo4j://server.dscl.fr:7687", auth=("neo4j", "s56brApr"))	
	with driver.session() as session:
		newsList = session.read_transaction(search_news_by_name, name)
	driver.close()
	return (newsList)

and from the Flask App :

@app.route('/search', methods = ['GET', 'POST'])
def search():

    if request.method == 'POST':
        my_data = search_query(request.form.get('search'))

The full debug trace gives :

 * Debugger PIN: 339-966-619

query=	MATCH (n:News {Symbol: $name}) 
		RETURN n.Date, n.Symbol, n.Title 
		ORDER BY n.Date DESC
		LIMIT 25

name=	UBI 

{'_connection': <neo4j.io._bolt4x0.Bolt4x0 object at 0x7fe008bab880>, '_hydrant': <neo4j.data.DataHydrator object at 0x7fe008baba60>, '_on_closed': <bound method Transaction._result_on_closed_handler of <neo4j.work.transaction.Transaction object at 0x7fe008bab850>>, '_metadata': {'query': '\n\t\tMATCH (n:News {Symbol: $name}) \n\t\tRETURN n.Date, n.Symbol, n.Title \n\t\tORDER BY n.Date DESC\n\t\tLIMIT 25\n\t\t', 'parameters': {'name': 'UBI'}, 'server': <neo4j.api.ServerInfo object at 0x7fe008baba00>, 't_first': 0, 'fields': ['n.Date', 'n.Symbol', 'n.Title'], 'qid': 0}, '_record_buffer': deque([]), '_summary': None, '_bookmark': None, '_qid': 0, '_fetch_size': 1000, '_discarding': False, '_attached': True, '_streaming': False, '_has_more': False, '_closed': False, '_keys': ['n.Date', 'n.Symbol', 'n.Title']}
92.154.43.222 - - [23/Jun/2020 09:16:31] "POST /search HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 2464, in __call__
    return self.wsgi_app(environ, start_response)
  File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 2450, in wsgi_app
    response = self.handle_exception(e)
  File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 1867, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.8/dist-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 1953, in full_dispatch_request
    return self.finalize_request(rv)
  File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 1968, in finalize_request
    response = self.make_response(rv)
  File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 2097, in make_response
    raise TypeError(
TypeError: The view function did not return a valid response. The function either returned None or ended without a return statement.

Any help will be appreciated

Hello @olivier :slight_smile:

Add a return statement to your search endpoint:

@app.route('/search', methods = ['GET', 'POST'])
def search():
    if request.method == 'POST':
        my_data = search_query(request.form.get('search'))
    return my_data

Regards,
Cobra

Only for now .... return my_data