Poj,
your suggestion is the right way, i will start from here.
I Just underline update is deprecated
@4000000058db6ef81e84eb6c # *** DEPRECATION WARNING ***
@4000000058db6ef81e84eb6c #
@4000000058db6ef81e84eb6c # The 'update' method will be removed in a f
+uture major release.
@4000000058db6ef81e84ef54 # Use $_, $_ or 'replace_one' instead.
so i made a little modification
my $col = $db->get_collection('counters');
$col->update_one({'_id' => 'comm-id'},{ '$inc' => { 'seq' => 1}});
my $id = $col->find_one({'_id' => 'comm-id'})->{'seq'};
so now it is working.
Thanks so much, it really help!
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