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

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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