Laravel 4.2: Troubleshooting "Target not instantiable" error - php

Question

I've been stuck on this "Target not instantiable" error for the last 2-3 days and I have no idea why. Someone in the IRC #laravel chat room, yesterday, suggested using var_dump(App::make('Project\Frontend\Repo\Lead\LeadInterface')) when in Artisan's tinker interface which I've done and got this response:
class Project\Frontend\Repo\Lead\EloquentLead#798 (1) {
protected $lead =>
class Lead#809 (21) {
// bunch of info about the model etc relating to the interface and it's repo class
}
}
One of the members in #laravel pointed out that this meant the interface was instantiated which is great but then I realised this isn't the interface that I'm having a problem with.
So below is how I have things setup. The interface that's apparently not instantiated is ValidableInterface (last portion of code) and running var_dump(App::make('Project\Backend\Service\Validation\ValidableInterface'))
returns the dreaded "Target not instantiable" error.
EDIT: new LeadFormLaravelValidator( $app['validator'] ) extends AbstractLaravelValidator which implements ValidableInterface.
Am I missing some glaring problem with my code?
My service provider
<?php namespace Project\Frontend\Service\Form;
use Illuminate\Support\ServiceProvider;
use Project\Frontend\Service\Form\Lead\LeadForm;
use Project\Frontend\Service\Form\Lead\LeadFormLaravelValidator;
class FormServiceProvider extends ServiceProvider {
/**
* Register the binding
*
* #return void
*/
public function register()
{
$app = $this->app;
$app->bind('Project\Frontend\Service\Form\Lead\LeadForm', function($app)
{
return new LeadForm(
new LeadFormLaravelValidator( $app['validator'] ),
$app->make('Project\Frontend\Repo\Lead\LeadInterface')
);
});
}
}
My form class
<?php namespace Project\Frontend\Service\Form\Lead;
use Project\Backend\Service\Validation\ValidableInterface;
use Project\Frontend\Repo\Lead\LeadInterface;
class LeadForm {
/**
* Form Data
*
* #var array
*/
protected $data;
/**
* Validator
*
* #var \Project\Backend\Service\Validation\ValidableInterface
*/
protected $validator;
/**
* Lead repository
*
* #var \Project\Frontend\Repo\Lead\LeadInterface
*/
protected $lead;
public function __construct(ValidableInterface $validator, LeadInterface $lead)
{
$this->validator = $validator;
$this->lead = $lead;
}
My validation rules
<?php namespace Project\Frontend\Service\Form\Lead;
use Project\Backend\Service\Validation\AbstractLaravelValidator;
class LeadFormLaravelValidator extends AbstractLaravelValidator {
/**
* Validation rules
*
* #var Array
*/
protected $rules = array(
'name' => 'required|regex:/^[a-zA-Z-\s]+$/',
'email' => 'email',
'cell' => 'required|numeric|digits_between:10,11',
);
/**
* Validation messages
*
* #var Array
*/
protected $messages = array(
'regex' => 'The :attribute may only contain letters, dashes and spaces.',
'digits_between' => 'The :attribute must be 10 numbers long.',
);
}
My abstract validator
<?php namespace Project\Backend\Service\Validation;
use Illuminate\Validation\Factory;
abstract class AbstractLaravelValidator implements ValidableInterface {
/**
* Validator
*
* #var \Illuminate\Validation\Factory
*/
protected $validator;
/**
* Validation data key => value array
*
* #var Array
*/
protected $data = array();
/**
* Validation errors
*
* #var Array
*/
protected $errors = array();
/**
* Validation rules
*
* #var Array
*/
protected $rules = array();
/**
* Custom validation messages
*
* #var Array
*/
protected $messages = array();
public function __construct(Factory $validator)
{
$this->validator = $validator;
}
/**
* Set data to validate
*
* #return \Project\Backend\Service\Validation\AbstractLaravelValidator
*/
public function with(array $data)
{
$this->data = $data;
return $this;
}
/**
* Validation passes or fails
*
* #return Boolean
*/
public function passes()
{
$validator = $this->validator->make($this->data, $this->rules, $this->messages);
if( $validator->fails() )
{
$this->errors = $validator->messages();
return false;
}
return true;
}
/**
* Return errors, if any
*
* #return array
*/
public function errors()
{
return $this->errors;
}
}
My validator interface
<?php namespace Project\Backend\Service\Validation;
interface ValidableInterface {
/**
* Add data to validation against
*
* #param array
* #return \Project\Backend\Service\Validation\ValidableInterface $this
*/
public function with(array $input);
/**
* Test if validation passes
*
* #return boolean
*/
public function passes();
/**
* Retrieve validation errors
*
* #return array
*/
public function errors();
}

Answer 1

I believe the problem is $app->make('Project\Frontend\Repo\Lead\LeadInterface'). Laravel has no way of knowing what class to instantiate here. You have to tell Laravel by doing:
$app->bind('Project\Frontend\Repo\Lead\LeadInterface', 'Your\Implementation\Of\LeadInterface');
Edit
It's weird that you get that exception since you manually instantiate LeadForm and inject the LeadFormLaravelValidator. However this should probably resolve the issue:
$app->bind('Project\Backend\Service\Validation\ValidableInterface',
'Project\Frontend\Service\Form\Lead\LeadFormLaravelValidator');