Twig Errors

#Twig Field Errors
Currently there was no easy way of adding errors to a standard twig / laravel build, so I created a quick filter and thought I would share, nothing crazy but hopefully someone else might find it useful.

##Install
Copy the below code into `lwig.php` within the extensions directory, if you don't have one follow the quick step below

#####If no extension directory:
* Create a directory under `app/` named `lextra` (or whateer you want).
* In your composer make sure you are autoloading that directory `"app/lextra"`.
* Run `composer dumpautoload` to generate the autoload file

##Code

    <?php
    namespace Ext;

    class Lwig extends \Twig_extension {

    	public function getFilters()
    	{
    		return array(
    			new \Twig_SimpleFilter('hasError', array($this, 'hasError'))
    		);
    	}
    
    	public function getName()
    	{
    		return 'Lwig';
    	}
    
    	/**
    	 * Usage on twig 'FIELD_NAME'|hasError(errors)
    	 * @param $field
    	 * @param $errorBag
    	 *
    	 * @return string Class name to add to the field
    	 */
    	public function hasError($field, $errorBag)
    	{
		    //If field error exists in the $errorBag
		    //return the class you want to add, maybe `has-success`?
    		if($errorBag->first($field) === "")
    			return '';
    
            //If it has an error add the error class
    		return ' has-error';
    	}
    }
    
##Usage

Assuming you are just using bootstrap you will want to add the class `has-error`

`address_two` is the field name and `errors` is the messagebag sent when you `Redirect::back()->withInput()->withErrors()`

    <div class="form-group{{ 'address_two'|hasError(errors) }}">
    	{{ Form.label('address_two', 'Address 2')|raw }}
    	{{ Form.text('address_two', '', {'class':'form-control'})|raw }}
    </div>