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Foreign key field additional SQL parameters

Foreign key field additional SQL parameters

3 years 7 months ago #1295 by RATE IT SERVICES, SIA

Hi there!

Would be great if a foreign key field could have additional parameter for select query.

Now we select table, key field and value field ..

But how about extra query? For example, I want to select only those records where certain fields have specific value.

SELECT id, name from #__sometable where otherfield=1 ..

I see that this could be possible with SQL list, but then there's no EMPTY RECORD (like Please select value (0) ) ..

I tried to do so with UNION ..

(SELECT '0' as id, 'Please select' as name from #__sometable LIMIT 1) UNION (SELECT id, name from #__sometable where parentid=0)

But then I get mysql errors when any field has selected that parentid field .. HAVING id='1'

thanks

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3 years 7 months ago #1296 by Andres Maeso

Hi!

Thanks for your feedback. Sounds like a good idea, let's see if it gets more votes!

Regards,

Andrés.


Andrés Maeso
Customer relations manager at Joomla Component Creator.

This email address is being protected from spambots. You need JavaScript enabled to view it.

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3 years 7 months ago #1297 by RATE IT SERVICES, SIA

administrator\models\forms\tablename.xml

add new attribute to field : where="parent_id=0"

administrator\models\fields\foreignkey.php

private $where_extra;

protected function getInput()
{
.......
$this->where_extra = (string) $this->getAttribute('where');

........

if($this->where_extra != '')
{
$query->where($this->where_extra);
}

....
}



works fine for me, it's just annoying to modify all this after rebuild .. :(

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3 years 4 months ago #1399 by Jeremy Morris

I have also added a "where" attribute to limit foreignkey results based on a condition.

// If the return is to be limited by condition
$this->where = ( trim ( $this->getAttribute('where') ) <> '' ) ? (string) trim( $this->getAttribute('where') ) : NULL;
.......
// add where filtering, if set
if ( $this->where ) {
$query->where($this->where);
} // end if


I have also found that displaying a completely empty select box is pretty useless so I set empty foreignkey fields to hide.

if ( count( $options ) ) {
$html = JHtml::_('select.genericlist', $options, $this->name, $input_options, 'value', 'text', $value, $this->id);
} else {
$html = '';
$this->hidden = true;
}

An additional attribute, such as "hideempty", could be helpful.

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