Filtros - CakePHP

gistfile1.php

public function pesquisacheques(){
		$this->LancamentoConta->Cheque->recursive = 2;		
		$this->request->data = $this->request->query;
		unset($this->request->data['submit']);
		$arraycerta = array();
		$pi = false;
		foreach($this->request->data as $key => $value){
			if($key == 'valor_de' || $key == 'valor_ate'){
				if(!$pi){
					if(!empty($value)){
						$this->request->data['valor_de'] = str_replace(',', '.', str_replace('.', '', str_replace('R$ ', '', $this->request->data['valor_de'])));
						$this->request->data['valor_ate'] = str_replace(',', '.', str_replace('.', '', str_replace('R$ ', '', $this->request->data['valor_ate'])));
						$key = str_replace('_de', '', $key);
						$key = str_replace('_ate', '', $key);
						$arraycerta[$key.' >= '] = $this->request->data['valor_de'];
						$arraycerta[$key.' <= '] = $this->request->data['valor_ate'];
						unset($this->request->data['valor_de']);
						unset($this->request->data['valor_ate']);
						$pi = true;
					}
				}
			}else{				
				if(!empty($value)){
					$arraycerta['Cheque.'.$key.' LIKE '] = '%'.$value.'%';
				}
			}
		}
		$this->request->data = $arraycerta;
		$conditions = $this->request->data;
		$conditions['Cheque.group_id = '] = $this->Session->read('choosed');
		$this->set('cheques', $this->paginate('Cheque',$conditions));
	}