[ic] Admin UI - Multiple select - Mysql multiple records update

[Alain]

Hello,
I search thru the list and doesn't find something enough details (The 
trouble is not the list but ONLY my knowledge !!) to do the following 
thing :

I set up a store wich sells dvd's.
One dvd can be in multiple "genres"
Then I use 3 tables (mysql):

products
sku      ..................
A0001    ..................
A0002    ..................
A0003    ..................


produits_genres
id   genre_id    sku
01   1           A0001
02   2           A0001
03   1           A0002
04   1           A0003
05   2           A0003

genres
id_genre    nom_genre
1           Fantastic
2           Action


I've create a new menu in icmenu to display a "Genres" link in the 
Item_edit submenu.
This link call a page called "item_genres" with the following code:
[if !cgi item_id]
	[bounce page="__UI_BASE__/item"]
[/if]
[calc]
	if(! $CGI->{mv_data_table}) {
		$CGI->{ui_hide_key} = 0;
		$CGI->{mv_data_table} = 'produits_genres';
	}
	if(! $CGI->{ui_data_fields}) {
		$CGI->{ui_data_fields} = '[db-columns name=produits_genres]';
		$CGI->{ui_display_only} = '';
	}
	if(! $CGI->{ui_break_before}) {
		$CGI->{ui_break_before} = '';
	}
	if(! $CGI->{ui_return_to}) {
		my @args = (
			 '__UI_BASE__/item_edit',
			 "item_id=$CGI->{item_id}",
			 "item_id_left=$CGI->{item_id_left}",
			 "ui_sequence_edit=$CGI->{ui_sequence_edit}",
		);
		$CGI->{ui_return_to} = join "\0", @args;
	}
	return;
[/calc]

[seti page_title]Genres: [cgi item_id][/seti]
[seti page_banner]Genres: edit item <B>[page 
href="__UI_BASE__/item_edit" form="item_id=[cgi item_id]"][cgi 
item_id]</A></B>[/seti]
[set help_name]item.editor[/set]
[set table_perm]inventory[/set]
[set icon_name]icon_item.gif[/set]

@_UI_STD_HEAD_@
<P>
[table-editor cgi=1]

[if-mm super]
<A HREF="[area href=admin/flex_editor
				form='
					item_id=[cgi item_id]
					mv_data_table=__ProductFiles_0__
					page_title=Edit items: [cgi item_id]
					help_name=inventory.edit
					ui_no_meta_display=1
					ui_hide_key=1
					ui_return_to=admin/item
					icon_name=icon_item.gif
					']">No meta display</A>
[/if-mm]

@_UI_STD_FOOTER_@
<!-- page: @@MV_PAGE@@ -->


Here is the display:

Genres:  edit item ADE0001

id       1

Genres   Fantastic <selected>
          Action

sku      ADE0001


When I select only "Action" and save, the two records in the 
"produits_genres" database are updated with the same value "2".
When after I select the two  "Genres" (Fantastic and Action) the two 
records in the "produits_genres" database (with A0001 sku) are updated 
with the same value "1".


I try to use the null_to_comma filter option in the "multiple select" 
control parameters but the result is the same.

The my question is the following:
How to setup the admin/item_genres page to
-first display a the correct selected choice in the "multiple select" 
control according to the database example shown at ther begin of this mail.

-second, but I think the answer will be very similar, how to update the 
"produits-genres" database content ?


Your help will be much helpfull than u can think.

Merci par avance.

Alain