Infinite Loop with RadioItems + SQL Queries

@LucaR wrote:

Hello Plotly community and thanks for the amazing product, I am enjoying Dash a lot! Anyway I am not an experienced programmer and I apologize in advance if I am asking something stupid.

My issue is this:
I have 3 sql tables I would like to visualize with a DataTable, and I would like to be able to switch between these 3 via a RadioItems object.
What I wrote up to know looks like this:
(inspirated by User input that updates an SQL Query)

app = dash.Dash(__name__)
server = app.server

def create_table(sql):
    conn = sqlite3.connect("/home/luca/fedigraph.sqlite3")
    df = pd.read_sql_query(sql, conn)
    conn.close()
    return html.Div(id='table_div', children=dash_table.DataTable(
        id='table',
        columns=[{"name": i, "id": i} for i in df.columns],
        data=df.to_dict('records'),
    ))

app.layout = html.Div([html.Label('Federated Platforms'),
                       dcc.RadioItems(
                           id='radio',
                           options=[
                               {'label': 'PeerTube', 'value': 'peertube'},
                               {'label': 'Friendica', 'value': 'friendica'},
                               {'label': 'Pleroma', 'value': 'pleroma'}
                           ],
                           value = 'peertube',
                       ),
                       html.Div(id='table_div')
                       ])


@app.callback(
    Output(component_id='table_div', component_property='children'),
    [Input(component_id='radio', component_property='value')]
)
def run_query(value):
    sql = "select count(*) from " + value + "_instances where timestamp > '2020-01-22 00:00:00'"
    return create_table(sql)


if __name__ == '__main__':
    app.run_server(debug=True)

However, this ends up in an infinite loop and I can not figure out why. Any information or help would be extremely appreciated.
Thanks a lot.
Luca

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