CakePHP Code Snippet: Return only fields with values to the DB upon saving.

This code goes in {ModelName}::beforeSave:

foreach ($this->data[$this->name] as $key => $value) {
    if (!set::classicExtract($this->data,$this->name . '.' . $key)) {
        $this->data = set::remove($this->data,$this->name . '.' . $key);

I use it where the DB may be expecting values for certain fields that are optional in the UI, and therefore may be returned empty by the controller.

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