What HTTP POST format to use for saving model and associated model data in a single controller function?

[Sam]

I am using Cakephp 2.4.5. I have 2 tables with a one-to-many relationship. 
Table B belongs to Table A. Table A has many Table B.

I want a controller in Table A that can save records in Table A and Table 
B. The controller code should be simple and looks like this;

public function add_tableA($id=null){
    if ($this->request->is('post')) 
    {
        $this->layout = null ;
        $this->TableA->create();                
        $this->TableA->saveAll($this->request->data, array('deep' => true));
    }}

My problem comes when trying to send the right HTTP POST format to the 
controller.

I tried to HTTP POST the data format below but it fails.

data[TableA][field1] = field1_value
data[TableA][field2] = field2_value
data[TableB][field1] = field1_value
data[TableB][field2] = field2_value

Then, I try to HTTP POST the data format below, at least TableA fields are 
populated.

data[TableA][field1] = field1_value
data[TableA][field2] = field2_value

How should the HTTP POST data format look like if I want to create rows for 
both tables?


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