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some issues - list of tags not returned

=== Dotted fields in MongoDB ===

Problem:

MongoDB 2.6 complains about fields that contains dots. Before 2015, Product Opener stored some backup versions of some fields by appending a dot and some string.

"The dotted field 'countries.20131226' in 'countries.20131226' is not valid for storage."

Resolution:

Those fields can be safely removed. (done in update_all_products_from_dir_in_mongodb.pl)

=== List of tag values (e.g. list of categories)

Problem:

With MongoDB 2.6, the aggregate command used to list all values of tags such as categories does not return the same structure.

in Display.pm:
<pre>
eval {
$results = $products_collection->aggregate( $aggregate_parameters );
};
</pre>

<pre>
-e: Not an ARRAY reference at /home/off/cgi//Blogs/Display.pm line 789.
</pre>

<pre>
display.pl : query_string: /lieux-de-fabrication
analyze_request : query_string 1 : /lieux-de-fabrication
analyze_request : query_string 2 : /lieux-de-fabrication
analyze_request : query_string 3 : lieux-de-fabrication
Display::analyze_request - last component - lieux-de-fabrication - plural? manufacturing_places
Display::analyze_request - list of tags - groupby: manufacturing_places
Display::analyze_request - lc: fr lang: fr text: - product: - tagtype/tagid: / - tagtype2/tagid2: / - groupby: manufacturing_places
display.pl blogid: tagid: urlsdate: urlid: user: query:
Display.pm - display_list_of_tags - query:
$VAR1 = {
'countries_tags' => 'en:france',
'_tags' => undef
};

Display.pm - display_list_of_tags - aggregate_parameters:
$VAR1 = [
{
'$match' => {
'countries_tags' => 'en:france',
'_tags' => undef
}
},
{
'$unwind' => '$manufacturing_places_tags'
},
{
'$group' => {
'count' => {
'$sum' => 1
},
'_id' => '$manufacturing_places_tags'
}
},
{
'$sort' => {
'count' => -1
}
}
];

Display.pm - display_list_of_tags - aggregate query done
Display.pm - display_list_of_tags - results:
$VAR1 = bless( {
'_database' => bless( {
'_connection' => bless( {
'w' => 1,
'query_timeout' => 30000,
'find_master' => 0,
'db_name' => 'admin',
'auto_reconnect' => 1,
'_servers' => {},
'ts' => 0,
'right_port' => 27017,
'wtimeout' => 1000,
'port' => 27017,
'left_port' => 27017,
'host' => 'localhost:27017',
'max_bson_size' => 16777216,
'timeout' => 20000,
'auto_connect' => 1
}, 'MongoDB::Connection' ),
'name' => 'off'
}, 'MongoDB::Database' ),
'name' => 'products.aggregate'
}, 'MongoDB::Collection' );

[Tue Jan 20 10:23:20 2015] [error] [Tue Jan 20 10:23:20 2015] -e: Not an ARRAY reference at /home/off/cgi//Blogs/Display.pm line 789.\n

</pre>

Expected:

<pre>
Display.pm - display_list_of_tags - aggregate query done
Display.pm - display_list_of_tags - results:
$VAR1 = [
{
'count' => 3055,
'_id' => 'france'
},
{
'count' => 542,
'_id' => 'bretagne'
},
..
</pre>

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