error handling - CakePHP - How to use onError in Model -

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i've created custom datasource fetches data web api, , i'm looking @ implementing error handling.

in datasource, i'm calling $model->onerror(). in model, i've created onerror method, , can access error details $this->getdatasource()->error;

however can't redirect or set flash message because can take place in controller, should doing here communicate error user?

are errors relevant fields in model? if so, use $this->invalidate($field, $message) in model::onerror()


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