mango-update.pl

# Mongo query
> db.links.update({ _id: ObjectId("...") }, { $push: { tweets: { text: 'A test string' } } }) 

# Mango ...?
my $url_obj = $mango->db( 'fomo' )->collection( 'links' )->find_one( $query );
if ( $url_obj ) {
    say "I'm updating..." . $url_obj->{'_id'};
    my $update = {
        '_id' => 'ObjectId("' . $url_obj->{'_id'} . '")',
        '$push' => {
            'tweets' => $tweet
        },
    };
say Dumper( $update );
my $result = $mango->db( 'fomo' )->collection( 'links' )->update( $update );