How to remove items from $this->data

Hi

I'm using CakePHP 1.2.3.8166 with PHP 5.2.9 on Apache 2.10

I'm hoping someone will give me a hand with what is essentially a PHP
question as oposed to a question about CakePHP.

I'm returning this data array from my add.ctp view:

Array
(
[Chart] => Array
(
[title] => Test Chart
[chart_type_id] => 1
[width] => 128
[height] => 128
)

[ChartsKpi] => Array
(
[1] => Array
(
[kpi_id] => 1
[kpi_colour_id] => 2
[width] => 5
)
[2] => Array
(
[kpi_id] => 2
[kpi_colour_id] => 3
[width] => 5
)
[3] => Array
(
[kpi_id] => 0
[kpi_colour_id] =>
[width] =>
)
[4] => Array
(
[kpi_id] => 0
[kpi_colour_id] =>
[width] =>
)
[5] => Array
(
[kpi_id] => 0
[kpi_colour_id] =>
[width] =>
)
[6] => Array
(
[kpi_id] => 0
[kpi_colour_id] =>
[width] =>
)
[16] => Array
(
[kpi_id] => 0
[kpi_colour_id] =>
[width] =>
)
[17] => Array
(
[kpi_id] => 0
[kpi_colour_id] =>
[width] =>
)
.......
)
)

You see all the sub arrays of [ChartsKpi] that have a kpi_id == 0? I
dont want to save those so I've a beforeSave callback in my ChartsKpi
model and I was trying to unset($this->data['ChartsKpi'][x]); but this
isn't working.

Is there an accepted way for taking data out of $this->data before
doing a save?

Thanks

David

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