codeigniter restful api illegal string offset in several fields - php

Question

I keep on getting this error in my codeigniter micro app restful api. When I post an item only the first letter is get saved with status code 400 being displayed.
here is my model file:
class Cities_model extends CI_Model {
public function __construct()
{
parent::__construct();
}
public function save($city)
{
$this->db->set($this->setCity($city, null))->insert('cities');
if ($this->db->affected_rows() > 0) {
return $this->db->insert_id;
}
return null;
}
public function update($id, $city)
{
$this->db->set($this->setCity($city))->where('id')->update('cities');
if ($this->db->affected_rows() === 1) {
return true;
}
return false;
}
private function setCity($city)
{
return array(
'id' => $city['id'],
'name' => $city['name']
);
}
}

Answer 1

As you can see setCity function treat $city variable as array. So you need to pass array to setCity function.
class Cities_model extends CI_Model {
public function __construct()
{
parent::__construct();
}
public function save($city)
{
$this->db->insert('cities',$this->setCity(array('name'=>$cit‌​y,'id'=> null)));
if ($this->db->affected_rows() > 0) {
return $this->db->insert_id();
}
return null;
}
public function update($id, $city)
{
$this->db->where('id',$id)->update('cities',$this->setCity(array('name'=>$cit‌​y,'id'=> $id)));
if ($this->db->affected_rows() === 1) {
return true;
}
return false;
}
private function setCity($city)
{
return array(
'id' => $city['id'],
'name' => $city['name']
);
}
}
another thing is, Codeignitor having method insert_id() to know last insert id.

Answer 2

<?php
defined('BASEPATH') OR exit('No direct script access allowed');
require APPPATH . '/libraries/REST_Controller.php';
class Cities extends REST_Controller{
public function __construct() {
parent::__construct();
$this->load->model('cities_model');
}
public function index_get(){
$cities=$this->cities_model->get();
if(!is_null($cities))
{
$this->response(array('response'=>$cities),200);
}
else
{
$this->response(array('error'=>'cities cannot be found...'),404);
}
}
public function find_get($id){
if(!$id)
{
$this->respose(null,400);
}
$cit=$this->cities_model->get($id);
if(!is_null($cit))
{
$this->response(array('response'=> $cit),200);
}
else{
$this->response(array('error'=> 'data could not be found...'),404);
}
}
public function index_post(){
// Use validation library, instead of checking just for value.
$this->load->library('form_validation');
$this->form_validation->set_rules('city','City','trim|required');
if($this->form_validation->run() == FALSE)
{
// send back list of validation errors.
$this->response($this->validation_errors(),REST_Controller::HTTP_BAD_REQUEST);
}
$id=$this->cities_model->save($this->post('city'));
if(!is_null($id))
{
$this->response(array('response'=> $id),REST_Controller::HTTP_OK);
}
else
{
$this->response(array('error'=> 'sorry, data could not be saved...'),REST_Controller::HTTP_BAD_REQUEST);
}
}
public function index_put(){
// for put you need to pass id as parameter
// Use validation library, instead of checking just for value.
$this->load->library('form_validation');
$this->form_validation->set_rules('id','ID','trim|required|integer');
$this->form_validation->set_rules('city','City','trim|required');
if($this->form_validation->run() == FALSE)
{
// send back list of validation errors.
$this->response($this->validation_errors(),REST_Controller::HTTP_BAD_REQUEST);
}
$update=$this->cities_model->update($this->post('id'),$this->post('city'));
if(!is_null($update))
{
$this->response(array('response' => 'content updated successfully'),REST_Controller::HTTP_OK);
}
else
{
$this->response(array('error'=> 'sorry, technical error occurred, please try again later...'), REST_Controller::HTTP_BAD_REQUEST);
}
}
public function index_delete($id){
if(!$id)
{
$this->response(null,400);
}
$del=$this->cities_model->delete($id);
if(!is_null($del))
{
$this->response(array('response'=> 'item successfully deleted'),200);
}
else{
$this->response(array('error'=> 'delete operations could not be done...'),400);
}
}
}
here is the model file:
<?php
class Cities_model extends CI_Model
{
public function __construct()
{
parent::__construct();
}
public function get($id=null)
{
if(!is_null($id))
{
$query=$this->db->select('*')->from('cities')->where('id',$id)->get();
if($query->num_rows()===1)
{
return $query->row_array();
}
return null;
}
$sql=$this->db->select('*')->from('cities')->get();
if($sql->num_rows()>0)
{
return $sql->result_array();
}
return null;
}
public function save($city)
{
$this->db->insert('cities', array('name'=>$city));
if($this->db->affected_rows()>0)
{
return $this->db->insert_id();
}
return null;
}
public function update($id, $city)
{
$this->db->where('id',$id)->update('cities',$this->setCity(array('name'=>$cit‌​y,'id'=> $id)));
if ($this->db->affected_rows() === 1) {
return true;
}
return false;
}
private function setCity($city)
{
return array('id'=>$city['id'],
'name'=>$city['name']
);
}
public function delete($id)
{
$this->db->where('id',$id)->delete('cities');
if($this->db->affected_rows()===1)
{
return true;
}
return false;
}
}