Errors in codeigniter-restserver library - rest

Question

I want to use restful in my ci 3.03 application:
I found this tutplus tutorial
I downloaded codeigniter-restserver-master.zip file and copied Format.php and REST_Controller.php(#version 3.0.0) files into /application/libraries/REST directory
I created control application/controllers/api/Users.php :
require_once("application/libraries/REST/REST_Controller.php");
require_once("application/libraries/REST/Format.php");
class Users extends REST_Controller
{
//protected $rest_format = 'json';
function users_get()
{
//$users = $this->user_model->get_all();
$filter_username= $this->get('filter_username');
$filter_user_group= $this->get('filter_user_group');
$filter_active= $this->get('filter_active');
$sort= $this->get('sort');
$sort_direction= $this->get('sort_direction');
//, $filter_user_group, $filter_active, $sort, $sort_direction
$users_list = $this->muser->getUsersList(false, ''/*, $filter_username, $filter_user_group, $filter_active, $sort, $sort_direction, ''*/);
echo '<pre>'.count($users_list).'::$users_lists::'.print_r($users_list,true).'</pre>';
if($users_list)
{
$this->response($users, 200);
}
else
{
$this->response(NULL, 404);
}
}
AND RUNNING URL http://local-ci3.com/api/users I got many errors:
A PHP Error was encountered
Severity: Notice
Message: Undefined property: Users::$format
Filename: REST/REST_Controller.php
Line Number: 734
Backtrace:
File: /mnt/diskD_Work/wwwroot/ci3/application/libraries/REST/REST_Controller.php
Line: 734
Function: _error_handler
File: /mnt/diskD_Work/wwwroot/ci3/application/libraries/REST/REST_Controller.php
Line: 649
Function: response
File: /mnt/diskD_Work/wwwroot/ci3/index.php
Line: 292
Function: require_once
A PHP Error was encountered
Severity: Notice
Message: Undefined property: Users::$format
Filename: REST/REST_Controller.php
Line Number: 752
Backtrace:
File: /mnt/diskD_Work/wwwroot/ci3/application/libraries/REST/REST_Controller.php
Line: 752
Function: _error_handler
File: /mnt/diskD_Work/wwwroot/ci3/application/libraries/REST/REST_Controller.php
Line: 649
Function: response
File: /mnt/diskD_Work/wwwroot/ci3/index.php
Line: 292
Function: require_once
Actually I wanted to get some workable library to help me with REST api creation. I think that is preferable way istead of making from zero.
But is this library not workable or does it needs for some fixing? Sorry, what I missed is if this library only for ci 2?
I made search on this forum and found such hint :
I have the same problem when I load both Format.php and
Rest_Controller.php into a controller. After have a quick glance at
Format.php, it appears to be a standalone format conversion helper.
Try to just load Rest_Controller.php and see if your problem goes
away.
I commented line
//require_once("application/libraries/REST/Format.php");
in my controller, but I still get errors like :
Message: Undefined property: Users::$format.
I tried to review code of this library and see that invalid block when data are converted to json format, line 731-757 :
elseif ($data !== NULL)
{
// If the format method exists, call and return the output in that format
if (method_exists($this->format, 'to_' . $this->response->format))
{
// Set the format header
$this->output->set_content_type($this->_supported_formats[$this->response->format], strtolower($this->config->item('charset')));
$output = $this->format->factory($data)->{'to_' . $this->response->format}();
// An array must be parsed as a string, so as not to cause an array to string error
// Json is the most appropriate form for such a datatype
if ($this->response->format === 'array')
{
$output = $this->format->factory($output)->{'to_json'}();
}
}
else
{
// If an array or object, then parse as a json, so as to be a 'string'
if (is_array($data) || is_object($data))
{
$data = $this->format->factory($data)->{'to_json'}();
}
// Format is not supported, so output the raw data as a string
$output = $data;
}
}
If I tried to commented this block, but get error
Message: Array to string conversion
Looks like data are not converted in this case...
Is is possible to fix these errors?
Or can you, please, to tell me advice some codeigniter 3 REST api workable library with similar interface like library above?
Thanks!

Answer 1

I use that lib, work just fine. My suggestion is follow the more relevant installation instruction on github .
you also wrong place the lib file :
Tutorial say :
require(APPPATH'.libraries/REST_Controller.php');
You try :
require_once("application/libraries/REST/REST_Controller.php");
require_once("application/libraries/REST/Format.php");
No need to include the format because on line 407 the lib will load it. And also good to know on line 404 it will load the configuration (application/config/rest.php) it will be your default configuration, and also you can change it to suit your need.
Please let me know if you still got error using my answer :)