Re: menu

On Tue, May 28, 2013 at 1:56 PM, Brian Wolf <..hidden..> wrote:

Excellent information.
I've created a new table, where one of the columns is the user_id, which would be passed in to the function.
Something like
select * from my_new_table where user_id = ?

First of all, I would avoid passing in a user id if you can. If you can pull the data out of the users table, that is better. Keep in mind, the user's login is found in the SESSION_USER pseudo field, so if you can:

SELECT * FROM my_new_table t JOIN users u ON u.id = t.user_id WHERE u.login=SESSION_USER;

that is far better.

Now for your stored procedure with arguments suppose you have something like:

CREATE OR REPLACE FUNCTION my_extended_information(in_menu_class int)

returns setof extended_menu_items

language sql as

select * from extended_menu_items where menu_class_id = $1;

$$;

You can then pull this information in with the following approaches:

$menu->exec_method(funcname => 'my_extended_information');

That will feed the http request param "menu_class" into the first argument automatically.

If you want to make it explicit:

$menu->call_procedure(procname => 'my_extended_information', args => [$request->{menu_class]);

You can use $request as well as $menu with call_procedure.

Basically you use PostgreSQL functions as "named queries" and can use the above two functions to pass arguments to them.

Best Wishes,

Chris Travers

Thanks.
Brian

Brian Wolf

Phone: 410.367.2958

Email: ..hidden..

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On 05/27/2013 10:14 PM, Chris Travers wrote:
Can you be more specific?

The general Perl object you probably want to use is LedgerSMB::DBObject::Menu and since this inherits from LedgerSMB::DBObject, the simplest way to do this is to create a user defined function in PostgreSQL. From there it is very straight-forward to pull that data into LedgerSMB as an array of hashrefs by using either $request->call_procedure if you want to use enumerated arguments, or $menu->exec_method if you want to use mapped arguments. In essence you can use a user defined function as a named query.

For example, if I wanted to select some information for the current logged in user, I might:

CREATE OR REPLACE FUNCTION custom_get_some_info()

returns setof menu_item language sql as $$

SELECT u.position, u.id, u.level, u.path, to_args(array[ua.attribute, ua.value))

FROM user_menu u

JOIN user_menu_attribute ua ON u.id = ua.node_id

WHERE u.login = SESSION_USER;

$$;

Note that you can also RETURN TABLE(....) and this will work as advertised.

Then from Perl you could add to a custom/menu.pl, the right namespace (LedgerSMB::Scripts::menu) and a modified version of the expanding_menu.pl. Unfortunately for now, the best thing to do would be to just copy/paste the function in there and then modify it. To call the procedure and get a list of hash refs it is as simple as:

@new_menu_items = $request->call_procedure(procname => 'custom_get_some_info');

or alternatively

@new_menu_items = $menu->exec_method(funcname => 'custom_get_some_info');

If you have to pass additional info to the function it is a little more complex than this, but with more info I can provide more info on how to do that in the framework. The big difference between call_procedure (which works from either $request or $menu) is that it takes enumerated arguments, while exec_method maps in arguments from current object properties.

Best Wishes,

Chris Travers
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