Question

In a Cakephp v2.3 App, there are two models:

Purchase Model: it contains the following main fields: id, invoice_date & gross_amount(calculated on Supplier.tax_rate).

class Purchase extends AppModel {

    public $displayField = 'id';
    public $belongsTo = 'Supplier';
}

Supplier Model: it contains id, name & tax_rate

class Supplier extends AppModel {
    public $displayField = 'name';
    public $hasMany = 'Purchase';
}

This is how my Add view of PurchasesController Looks:

Now, I want to get Supplier.tax_rate of currently selected supplier displayed In app/View/Purchase/add.ctp as label or text input.

Any idea how to do this?

Answer 1

I figured it out.
What, I ended up doing was putting all supplier tax rate data as JSON, outputting that into the view & then using client-side javascript to select the relevant code.

PurchasesController calls a custom model method which fires up a SQL query to get all supplier tax rate data.

$supplier_tax_rate = $this->Purchase->Supplier->getTaxRate();
$this->set('supplier_tax_rate', json_encode($supplier_tax_rate));

The, in the client-side. I used Javascript to do what I wanted, here supplier_tax_rates is the variable which stored JSON tax rate data & getTaxRate is a variable function which returns tax rate from JSON based on id from supplier downdown.

$(function() {
    var taxRates = $.parseJSON(supplier_tax_rates);

    var getTaxRate = function(id) {
        for (var i in taxRates) {
            if (taxRates[i].id == id) {
                return taxRates[i].tax_percentage_charged;
            }
        }
    };
}); 

This has worked nicely for me, Hope it helps other people who want to get some data from database in cake, based on the value of dropdown.