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https://github.com/kouks/laravel-casters
Provides a convenient way to cast and transform your models for API purposes.
https://github.com/kouks/laravel-casters
Last synced: 18 days ago
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Provides a convenient way to cast and transform your models for API purposes.
- Host: GitHub
- URL: https://github.com/kouks/laravel-casters
- Owner: kouks
- License: mit
- Created: 2016-11-06T21:59:48.000Z (about 8 years ago)
- Default Branch: master
- Last Pushed: 2016-11-07T22:02:10.000Z (about 8 years ago)
- Last Synced: 2024-10-16T02:27:54.161Z (30 days ago)
- Language: PHP
- Size: 67.4 KB
- Stars: 1
- Watchers: 2
- Forks: 0
- Open Issues: 3
-
Metadata Files:
- Readme: readme.md
- License: LICENSE
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README
# Laravel Casters
[](https://scrutinizer-ci.com/g/kouks/laravel-casters/?branch=master)
[](https://packagist.org/packages/kouks/laravel-casters)
[](https://travis-ci.org/kouks/laravel-casters)
[](https://styleci.io/repos/73021711)
## Contents
- [Installation](#installation)
- [Usage](#usage)
- [FAQ](#faq)
## Installation
### Composer
Open your console and `cd` into your Laravel project. Run:
```bash
composer require kouks/laravel-casters
```
Yeah, you are pretty much ready to go right now...
## Usage
### Creating casters
You can put you casters pretty much anywhere, but I suppose you put them in a `app/Casters` directory. Now make a new php class, we are gonna be casting a Post model here. __Suppose our model has only `id`, `title`, `body` and `active` database columns, along with timestamps.__
```php
namespace App\Casters;
use Koch\Casters\Caster;
class PostCaster extends Caster
{
//
}
```
Good! Now we can put in our first casting rule.
```php
namespace App\Casters;
use Koch\Casters\Caster;
class PostCaster extends Caster
{
public castRules()
{
return [
'title',
];
}
}
```
This caster is going to cast only the title column, leaving its contents unchanged. More about making rules in the follwing section.
### Making your rules
Let's move on how to make your own rules, there are __four__ ways to achieve that at this moment.
__Simple casting/renaming columns__
There was an example of a simple cast rule in the previous section. Let us reviews it again and att something up.
```php
namespace App\Casters;
use Koch\Casters\Caster;
class PostCaster extends Caster
{
public castRules()
{
return [
'title',
'body' => 'long_text',
];
}
}
```
This rule will remain the `title` column unchanged completely, and renaming the `body` column to `long_text`, however __leaving the contents unchanged__.
__Using cast queries__
Similar to Laravel's validation rules, you can use queries to cast.
```php
namespace App\Casters;
use Koch\Casters\Caster;
class PostCaster extends Caster
{
public castRules()
{
return [
'active' => '!name:is_active|type:bool',
];
}
}
```
Note the `!` before the cast rule. This says that we want to use a query. This simple query renames the `active` column to `is_active` and casts its contents to a boolean. All documentation on cast queries can be found in the [Cast queries](#cast-queries) section.
__Casting using a closure__
As a value of the cast rules, you can speficy a closure, which will determine what data to return.
```php
namespace App\Casters;
use App\Post;
use Koch\Casters\Caster;
class PostCaster extends Caster
{
public castRules()
{
return [
'text' => function (Post $post) {
return str_limit($post->body, 100);
},
];
}
}
```
This particular query is going to cast a __new__ column `body` and as its contents it is going to use whatever is returned from the closure. In this case - the post body limited to 100 characters. Note that __you are given an instance of the model__ that is being cast in the closure arguments.
__Casting using a method__
You can even use other methods on the caster class to determine what is going to be cast.
```php
namespace App\Casters;
use App\Post;
use Koch\Casters\Caster;
class PostCaster extends Caster
{
public castRules()
{
return [
'draft' => '@isDraft',
];
}
public function isDraft(Post $post)
{
return ! $post->active;
}
}
```
Notice the `@` sign - it is to determine that we want to use a caster class method to do the casting. This cast is (similarly to the closure one) create a new column `draft`, which is just a negation of the `active` column in this example. You are given the model instance in this case, too.
### Actual casting
The actual casting gets really simple, there are two ways to cast you data at this moment.
__Casting a single model__
Let us have a controller action `show`, which is going to cast our model, and retrun it as json.
```php
...
class PostController extends Controller
{
public function show(Post $post, PostCaster $caster)
{
return $caster->cast($post);
}
}
```
Note that you can use _DI_ for your casters, as with anything in Laravel. Then you call a single `cast` method and provide you model instance in the arguments. __If we were to combine all the example casters__, the returned json could look following:
```json
{
"id": 1,
"title": "Some title",
"long_text": "Some long text...",
"text": "Some long text...",
"active": true,
"draft": false,
"updated_at": {
"date": "2016-11-01 00:38:03.000000",
"timezone_type": 3,
"timezone": "UTC"
},
"created_at": {
"date": "2016-08-06 17:58:09.000000",
"timezone_type": 3,
"timezone": "UTC"
}
}
```
_Note that in the example above, the `text` field is going to be limited to 100 characters._
__Casting a collection__
You cast collections in __the same way__ that you would cast single models. Only difference is that you are given back array of cast models, instead of a single one.
__Casting directly from model instance__
This package provides the `Koch\Casters\Behavior\Castable` trait, which lets you do __both__ casting a single model as follows:
```php
$post->cast($caster);
```
__and__ a collection directly from you query:
```php
Post::cast($caster);
```
__Also note that if you specify a full class path to the caster in you model, you can omit the `caster` variable completely.__
```php
...
class Post extends Model
{
use Castable;
protected $caster = App\Casters\PostCaster::class;
}
```
Lets you do this fancy stuff:
```php
$post->cast();
Post::cast();
```
If you follow the convention of storing your casters in the `app/Casters` directory as well as the naming conventions, this package will try to find related caster in that location - this lets you leave out even the `caster` property.
### Casting relationships
There, obviously, is a way to cast relationships. Suppose there is a related model `Comments`, wich has a `many-one` relationship with our `Post` model. Also suppose that there is a `CommentCaster` set up. Look at the following code:
```php
namespace App\Casters;
use App\Post;
use Koch\Casters\Caster;
class PostCaster extends Caster
{
protected $commentCaster;
public function __construct(CommentCaster $commentCaster)
{
$this->commentCaster = $commentCaster;
}
public castRules()
{
return [
'comments' => function (Post $post) {
return $this->commentCaster->cast($post->comments);
},
];
}
}
```
Note that even here you can levarage Laravel's _DI_. You now create a new column `comments`, which is then populated by the closure. This closure usis the injected caster to cast the comments relationship. You can do the same with casting via methods.
__Also beware of cycling your casts. At the moment, there is no check for that. So if you were to cast your `comments` relationship on the `PostCaster` and do the same vice versa, you'd end end with a 500.__ Feel free to submit a PR correcting this issue.
### Cast queries
At this moment, there are only two queries. I am open for suggestions to add more.
- __`name:new_name`__
- __`type:new_type`__ - accepts `int`, `string`, `bool` and `float`
### Abstracion
There is a `Koch\Casters\Contracts\Caster` interface, which you could use for example with the repository pattern, where you have a parent `Repository` class which deals with all the stuff around any model, including casting it. You might want to inject the caster though a `PostRepository` constructor, in which case, the parent class would require the contract.
## FAQ
Nobody has ever asked me anything about this package so I can't determine the frequency of questions.