Hooks

Hooks

A hook is a method of directly adding functionality to a class from the outside and without having to extend it or directly modify it.

Introduction

This section will help you get started with hooks.

Hooks

A hook is similar to a callback trigger. A hook applies to any instance of a class and any parent that inherits that class.

Bindings

By binding a hook you can change the context of $this so that the hook behaves like an actual method of the class. Where $this refers to the class the hook is being run on and not where the hook is being defined (like normal Closure behavior).

Basic Usage

Use the \Anomaly\Streams\Platform\Traits\Hookable trait in your class to get started.

Hookable::hook()

The hookable method let's you register a hook on a hookable class.

Returns: $this

Arguments

Example

$hookable->hook(
    'avatar',
    function ($email) {
        return 'https://www.gravatar.com/avatar/' . md5($email);
    }
);

$hookable->avatar('[email protected]');

Hookable::bind()

The bind method is very similar to hook but the callback is available for all instances of the class as well as any parents of the class.

Returns: $this

Arguments

Example

$hookable->bind(
    'customer',
    function () {

        /* @var UserModel $this */
        return $this->hasOne(CustomerModel::class, 'user_id');
    }
);

$hookable->bind(
    'get_customer',
    function () {

        /* @var UserModel $this */
        return $this->customer()->first();
    }
);

Hookable::call()

The call method fires the hook.

Returns: mixed

Arguments

Example

$hookable->call('get_customer')->billing_address;

Twig

{{ user().call('get_customer').billing_address }}

Hookable::hasHook()

The hasHook method returns whether a hook exists or not for the object.

Returns: boolean

Arguments

Example

$hookable->hasHook('get_customer');

Method Handlers

Not always, but generally classes in the Streams Platform that use the Hookable trait will map the __call method through hooks.

What this means is that hooks will be checked for when the __call method is triggered.

If the hook is get_customer the method will be getCustomer.

// First bind the hook.
$hookable->bind(
    'get_customer',
    function () {

        /* @var UserModel $this */
        return $this->customer()->first();
    }
);

// Now fire using the handler method.
$hookable->getCustomer()->billing_address;

Getter Behavior

Not always, but generally classes in the Streams Platform that use the Hookable trait will map the __get method through hooks.

What this means is that hooks prefixed with get_ will be checked for when the __get method is triggered.

// Register the hook
$hookable->bind(
    'get_customer',
    function () {

        /* @var UserModel $this */
        return $this->customer()->first();
    }
);

// Call the hook with method handler.
$hookable->customer->billing_address;

This method is very helpful in the view layer:

{{ user().customer.billing_address }}