Dash_table upgrade issue

@daniyal134 wrote:

Hello everyone,

I have been loving dash and using it for a while now. Recently, I had to re-install the packages and thus dash updated. After that, I have been experiencing an error for the data table. I am basically updating the data table depending on the selection of a dropdown menu. Here is the part that gets triggered when the drowdown selection changes:

@app.callback([Output('datatable', 'data'),
               Output('datatable', 'columns')],
              [Input('user_selection', 'value')])
def update_output(value):
    user_found = False
    for user in all_users:
        if user.id == value:
            selectedUserIndex = all_users.index(user)
            user_found = True
            break

    if user_found:
        selected_user = all_users[selectedUserIndex]
        all_sessions_df = pd.DataFrame.from_records([s.to_dict() for s in selected_user.allSessions])
        return all_sessions_df.to_dict('records'), [{"name": j, "id": j} for j in all_sessions_df.columns]
    else:
        return [], []

Before the upgrade, everything was working fine. Now, I am getting the following error:

Invalid argument columns[0] passed into DataTable with ID “datatable”.
Expected object.
Was supplied type string.

when I load the page.

Any help will be highly appreciated.
Thanks,
Daniyal

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