[FIXED] Yii2, optional parameter in the rounte

Issue

During the development, I have faced to the one issue with urlManager.

I have SiteController with "category" action.

public function actionCategory($id = null, $city = null, $location = null)
{
   echo $id;
   echo $city;
   echo $location;
}

All possible combination that can be used with this action:

id, city, location = null
id, city = null, location
id, city = null, location = null
id = null, city = null, location = null
id = null, city = null, location

I do not know how to write the rules in the UrlManager, after that I will get the following values in the variables after press the links:

<h4><?= Html::a('ID City', ['/site/category', 'id' => 'barbershop', 'city' => 'Praha'], ['class' => 'btn btn-primary']) ?></h4>
The return value from "category" action:

id = 'barbershop'
city = 'Praha'
location = ''

<h4><?= Html::a('ID Location', ['/site/category', 'id' => 'barbershop', 'location' => '23,65'], ['class' => 'btn btn-primary']) ?></h4>
The return value from "category" action:

id = 'barbershop'
city = ''
location = '23,65'

<h4><?= Html::a('ID', ['/site/category', 'id' => 'barbershop'], ['class' => 'btn btn-primary']) ?></h4>
The return value from "category" action:

id = 'barbershop'
city = ''
location = ''

<h4><?= Html::a('City', ['/site/category', 'city' => 'Praha'], ['class' => 'btn btn-primary']) ?></h4>
The return value from "category" action:

id = ''
city = 'Praha'
location = ''

<h4><?= Html::a('Location', ['/site/category', 'location' => '14,23'], ['class' => 'btn btn-primary']) ?></h4>
The return value from "category" action:

id = ''
city = ''
location = '14,23'

Would you like you help me with this issue?

Solution

As per your requirements you need to set rules only for Controller and action name. All other fields are passed through $_GET. and you can fetch them using Yii::$app->getRequest()->getQueryParam('param') method.

For you url you can use normal rules for pretty url like

'urlManager' => [
        'enablePrettyUrl' => true,
        'showScriptName' => false,
        'rules' => [
            '<controller:\w+>/<id:\d+>' => '<controller>/view',
            '<controller:\w+>/<action:\w+>/<id:\d+>' => '<controller>/<action>',
            '<controller:\w+>/<action:\w+>' => '<controller>/<action>',
        ],
    ],

Answered By - Ninja Turtle