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## Introduction
This inverse version of `HasManyThrough` allows `BelongsToThrough` relationships with unlimited intermediate models.
Supports Laravel 5.0+.
## Installation
composer require staudenmeir/belongs-to-through:"^2.5"
## Usage
Consider this `HasManyThrough` relationship:
`Country` → has many → `User` → has many → `Post`
```php
class Country extends Model
{
public function posts()
{
return $this->hasManyThrough('App\Post', 'App\User');
}
}
```
Use the `BelongsToThrough` trait in your model to define the inverse relationship:
`Post` → belongs to → `User` → belongs to → `Country`
```php
class Post extends Model
{
use \Znck\Eloquent\Traits\BelongsToThrough;
public function country()
{
return $this->belongsToThrough('App\Country', 'App\User');
}
}
```
You can also define deeper relationships:
`Comment` → belongs to → `Post` → belongs to → `User` → belongs to → `Country`
Supply an array of intermediate models as the second argument, from the related (`Country`) to the parent model (`Comment`):
```php
class Comment extends Model
{
use \Znck\Eloquent\Traits\BelongsToThrough;
public function country()
{
return $this->belongsToThrough('App\Country', ['App\User', 'App\Post']);
}
}
```
You can specify custom foreign keys as the fifth argument:
```php
class Comment extends Model
{
use \Znck\Eloquent\Traits\BelongsToThrough;
public function country()
{
return $this->belongsToThrough(
'App\Country',
['App\User', 'App\Post'],
null,
'',
['App\User' => 'custom_user_id']
);
}
}
```
### Table Aliases
If your relationship path contains the same model multiple times, you can specify a table alias (Laravel 6+):
```php
class Comment extends Model
{
use \Znck\Eloquent\Traits\BelongsToThrough;
public function grandparent()
{
return $this->belongsToThrough(
'App\Comment',
'App\Comment as alias',
null,
'',
['App\Comment' => 'parent_id']
);
}
}
```
Use the `HasTableAlias` trait in the models you are aliasing:
```php
class Comment extends Model
{
use \Znck\Eloquent\Traits\HasTableAlias;
}
```
### Soft Deleting
By default, soft-deleted intermediate models will be excluded from the result. Use `withTrashed()` to include them:
```php
class Comment extends Model
{
use \Znck\Eloquent\Traits\BelongsToThrough;
public function country()
{
return $this->belongsToThrough('App\Country', ['App\User', 'App\Post'])
->withTrashed('users.deleted_at');
}
}
class User extends Model
{
use SoftDeletes;
}
```
## Contributing
Please see [CONTRIBUTING](.github/CONTRIBUTING.md) and [CODE OF CONDUCT](.github/CODE_OF_CONDUCT.md) for details.
## Credits
- [Rahul Kadyan](https://github.com/znck)
- [Danny Weeks](https://github.com/dannyweeks)
- [All Contributors](../../contributors)