3.0 - How to add a form data using its primarykey to its associated tables

Hi,

i have Tables :

Units hasOne costs & hasOne fixed_costs

i want to add data to costs and fixed_costs table using units's primary key from units Controller.

i did below things but its creating a new record at unit Table instead of using primaryKey

Form at unitsController:

<?php

echo $this->Form->create($unit);

echo $this->Form->input('cost.rental_cost');

echo $this->Form->input('fixed_cost.gas_bill');

echo $this->Form->input('fixed_cost.water_bill');

echo $this->Form->input('fixed_cost.service_bill');

echo $this->Form->button('Save Costs');

echo $this->Form->end();

?>

Function at UnitsController:

public function add_cost($uId){

        if (!$uId){

            throw new NotFoundException(__('Unit id Not found, try with a valid ID'));

        }

        

        $unitId = $this->Units->get($uId);

        

        $unit = $this->Units->newEntity($this->request->data(),['associated' => ['Costs', 'FixedCosts']]);

        

        if ($this->request->is('post')){

            $unit->cost->unit_id = $unit->fixed_cost->unit_id = $unitId->id;

            if ($this->Units->save($unit)){

                $this->Flash->success(__('The unit cost has been added'));

                return $this->redirect(['controller' => 'houses', 'action' => 'view', $unit->house_id]);

            }

        }

        

        $this->set(compact('unit'));

    }

Please suggest me on this regard.

Thanks

Bayezid

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