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## Introduction
This extended version of `HasManyThrough` allows relationships with unlimited intermediate models.
It supports [many-to-many](#manytomany) and [polymorphic](#morphmany) relationships and all their possible combinations.
Supports Laravel 5.5.29+.
## Installation
composer require staudenmeir/eloquent-has-many-deep:"^1.7"
Use this command if you are in PowerShell on Windows (e.g. in VS Code):
composer require staudenmeir/eloquent-has-many-deep:"^^^^1.7"
## Versions
Laravel | Package
:--------|:----------
5.5–5.7 | 1.7
5.8 | 1.8
6.x | 1.11
7.x | 1.12
8.x | 1.13
## Usage
- [HasMany](#hasmany)
- [ManyToMany](#manytomany)
- [MorphMany](#morphmany)
- [MorphToMany](#morphtomany)
- [MorphedByMany](#morphedbymany)
- [BelongsTo](#belongsto)
- [Existing Relationships](#existing-relationships)
- [HasOneDeep](#hasonedeep)
- [Intermediate and Pivot Data](#intermediate-and-pivot-data)
- [Table Aliases](#table-aliases)
- [Soft Deleting](#soft-deleting)
The package offers two ways of defining deep relationships:
You can specify the intermediate models, foreign and local keys manually or concatenate [existing relationships](#existing-relationships).
### HasMany
Consider the [documentation example](https://laravel.com/docs/eloquent-relationships#has-many-through) with an additional level:
`Country` → has many → `User` → has many → `Post` → has many → `Comment`
```php
class Country extends Model
{
use \Staudenmeir\EloquentHasManyDeep\HasRelationships;
public function comments()
{
return $this->hasManyDeep('App\Comment', ['App\User', 'App\Post']);
}
}
```
Just like with `hasManyThrough()`, the first argument of `hasManyDeep()` is the related model. The second argument is an array of intermediate models, from the far parent (the model where the relationship is defined) to the related model.
By default, `hasManyDeep()` uses the Eloquent conventions for foreign and local keys. You can also specify custom foreign keys as the third argument and custom local keys as the fourth argument:
```php
class Country extends Model
{
use \Staudenmeir\EloquentHasManyDeep\HasRelationships;
public function comments()
{
return $this->hasManyDeep(
'App\Comment',
['App\User', 'App\Post'], // Intermediate models, beginning at the far parent (Country).
[
'country_id', // Foreign key on the "users" table.
'user_id', // Foreign key on the "posts" table.
'post_id' // Foreign key on the "comments" table.
],
[
'id', // Local key on the "countries" table.
'id', // Local key on the "users" table.
'id' // Local key on the "posts" table.
]
);
}
}
```
You can use `null` placeholders for default keys:
```php
class Country extends Model
{
use \Staudenmeir\EloquentHasManyDeep\HasRelationships;
public function comments()
{
return $this->hasManyDeep('App\Comment', ['App\User', 'App\Post'], [null, 'custom_user_id']);
}
}
```
### ManyToMany
You can include `ManyToMany` relationships in the intermediate path.
#### ManyToMany → HasMany
Consider the [documentation example](https://laravel.com/docs/eloquent-relationships#many-to-many) with an additional `HasMany` level:
`User` → many to many → `Role` → has many → `Permission`
Add the pivot table to the intermediate models:
```php
class User extends Model
{
use \Staudenmeir\EloquentHasManyDeep\HasRelationships;
public function permissions()
{
return $this->hasManyDeep('App\Permission', ['role_user', 'App\Role']);
}
}
```
If you specify custom keys, remember to swap the foreign and local key on the "right" side of the pivot table:
```php
class User extends Model
{
use \Staudenmeir\EloquentHasManyDeep\HasRelationships;
public function permissions()
{
return $this->hasManyDeep(
'App\Permission',
['role_user', 'App\Role'], // Intermediate models and tables, beginning at the far parent (User).
[
'user_id', // Foreign key on the "role_user" table.
'id', // Foreign key on the "roles" table (local key).
'role_id' // Foreign key on the "permissions" table.
],
[
'id', // Local key on the "users" table.
'role_id', // Local key on the "role_user" table (foreign key).
'id' // Local key on the "roles" table.
]
);
}
}
```
#### ManyToMany → ManyToMany
Consider the [documentation example](https://laravel.com/docs/eloquent-relationships#many-to-many) with an additional `ManyToMany` level:
`User` → many to many → `Role` → many to many → `Permission`
Add the pivot table to the intermediate models:
```php
class User extends Model
{
use \Staudenmeir\EloquentHasManyDeep\HasRelationships;
public function permissions()
{
return $this->hasManyDeep('App\Permission', ['role_user', 'App\Role', 'permission_role']);
}
}
```
### MorphMany
You can include `MorphMany` relationships in the intermediate path.
Consider the [documentation example](https://laravel.com/docs/eloquent-relationships#polymorphic-relations) with an additional level:
`User` → has many → `Post` → morph many → `Comment`
Specify the polymorphic foreign keys as an array, starting with the `*_type` column:
```php
class User extends Model
{
use \Staudenmeir\EloquentHasManyDeep\HasRelationships;
public function postComments()
{
return $this->hasManyDeep(
'App\Comment',
['App\Post'],
[null, ['commentable_type', 'commentable_id']]
);
}
}
```
### MorphToMany
You can include `MorphToMany` relationships in the intermediate path.
Consider the [documentation example](https://laravel.com/docs/eloquent-relationships#many-to-many-polymorphic-relations) with an additional level:
`User` → has many → `Post` → morph to many → `Tag`
Add the pivot table to the intermediate models and specify the polymorphic foreign keys as an array, starting with the `*_type` column:
```php
class User extends Model
{
use \Staudenmeir\EloquentHasManyDeep\HasRelationships;
public function postTags()
{
return $this->hasManyDeep(
'App\Tag',
['App\Post', 'taggables'],
[null, ['taggable_type', 'taggable_id'], 'id'],
[null, null, 'tag_id']
);
}
}
```
Remember to swap the foreign and local key on the "right" side of the pivot table:
### MorphedByMany
You can include `MorphedByMany` relationships in the intermediate path.
Consider the [documentation example](https://laravel.com/docs/eloquent-relationships#many-to-many-polymorphic-relations) with an additional level:
`Tag` → morphed by many → `Post` → has many → `Comment`
Add the pivot table to the intermediate models and specify the polymorphic local keys as an array, starting with the `*_type` column:
```php
class Tag extends Model
{
use \Staudenmeir\EloquentHasManyDeep\HasRelationships;
public function postComments()
{
return $this->hasManyDeep(
'App\Comment',
['taggables', 'App\Post'],
[null, 'id'],
[null, ['taggable_type', 'taggable_id']]
);
}
}
```
### BelongsTo
You can include `BelongsTo` relationships in the intermediate path:
`Tag` → morphed by many → `Post` → belongs to → `User`
Swap the foreign and local key:
```php
class Tag extends Model
{
use \Staudenmeir\EloquentHasManyDeep\HasRelationships;
public function postAuthors()
{
return $this->hasManyDeep(
'App\User',
['taggables', 'App\Post'],
[null, 'id', 'id'],
[null, ['taggable_type', 'taggable_id'], 'user_id']
);
}
}
```
### Existing Relationships
You can also define a `HasManyDeep` relationship by concatenating existing relationships:
```php
class Country extends Model
{
use \Staudenmeir\EloquentHasManyDeep\HasRelationships;
public function comments()
{
return $this->hasManyDeepFromRelations($this->posts(), (new Post)->comments());
}
public function posts()
{
return $this->hasManyThrough('App\Post', 'App\User');
}
}
class Post extends Model
{
public function comments()
{
return $this->hasMany('App\Comment');
}
}
```
### HasOneDeep
Define a `HasOneDeep` relationship if you only want to retrieve a single related instance:
```php
class Country extends Model
{
use \Staudenmeir\EloquentHasManyDeep\HasRelationships;
public function latestComment()
{
return $this->hasOneDeep('App\Comment', ['App\User', 'App\Post'])
->latest('comments.created_at');
}
}
```
### Intermediate and Pivot Data
Use `withIntermediate()` to retrieve attributes from intermediate tables:
```php
public function comments()
{
return $this->hasManyDeep('App\Comment', ['App\User', 'App\Post'])
->withIntermediate('App\Post');
}
foreach ($country->comments as $comment) {
// $comment->post->title
}
```
By default, this will retrieve all the table's columns. Be aware that this executes a separate query to get the list of columns.
You can specify the selected columns as the second argument:
```php
public function comments()
{
return $this->hasManyDeep('App\Comment', ['App\User', 'App\Post'])
->withIntermediate('App\Post', ['id', 'title']);
}
```
As the third argument, you can specify a custom accessor:
```php
public function comments()
{
return $this->hasManyDeep('App\Comment', ['App\User', 'App\Post'])
->withIntermediate('App\Post', ['id', 'title'], 'accessor');
}
foreach ($country->comments as $comment) {
// $comment->accessor->title
}
```
If you retrieve data from multiple tables, you can use nested accessors:
```php
public function comments()
{
return $this->hasManyDeep('App\Comment', ['App\User', 'App\Post'])
->withIntermediate('App\Post')
->withIntermediate('App\User', ['*'], 'post.user');
}
foreach ($country->comments as $comment) {
// $comment->post->title
// $comment->post->user->name
}
```
Use `withPivot()` for the pivot tables of `BelongsToMany` and `MorphToMany`/`MorphedByMany` relationships:
```php
public function permissions()
{
return $this->hasManyDeep('App\Permission', ['role_user', 'App\Role'])
->withPivot('role_user', ['expires_at']);
}
foreach ($user->permissions as $permission) {
// $permission->role_user->expires_at
}
```
You can specify a custom pivot model as the third argument and a custom accessor as the fourth:
```php
public function permissions()
{
return $this->hasManyDeep('App\Permission', ['role_user', 'App\Role'])
->withPivot('role_user', ['expires_at'], 'App\RoleUser', 'pivot');
}
foreach ($user->permissions as $permission) {
// $permission->pivot->expires_at
}
```
### Table Aliases
If your relationship path contains the same model multiple times, you can specify a table alias:
```php
class Post extends Model
{
use \Staudenmeir\EloquentHasManyDeep\HasRelationships;
public function commentReplies()
{
return $this->hasManyDeep('App\Comment', ['App\Comment as alias'], [null, 'parent_id']);
}
}
```
Use the `HasTableAlias` trait in the models you are aliasing:
```php
class Comment extends Model
{
use \Staudenmeir\EloquentHasManyDeep\HasTableAlias;
}
```
For pivot tables, this requires custom models:
```php
class User extends Model
{
use \Staudenmeir\EloquentHasManyDeep\HasRelationships;
public function permissions()
{
return $this->hasManyDeep('App\Permission', ['App\RoleUser as alias', 'App\Role']);
}
}
class RoleUser extends Pivot
{
use \Staudenmeir\EloquentHasManyDeep\HasTableAlias;
}
```
Use `setAlias()` to specify a table alias when concatenating existing relationships (Laravel 6+):
```php
class Post extends Model
{
use \Staudenmeir\EloquentHasManyDeep\HasRelationships;
public function commentReplies()
{
return $this->hasManyDeepFromRelations(
$this->comments(),
(new Comment)->setAlias('alias')->replies()
);
}
public function comments()
{
return $this->hasMany(Comment::class);
}
}
class Comment extends Model
{
use \Staudenmeir\EloquentHasManyDeep\HasTableAlias;
public function replies()
{
return $this->hasMany(self::class, 'parent_id');
}
}
```
### Soft Deleting
By default, soft-deleted intermediate models will be excluded from the result. Use `withTrashed()` to include them:
```php
class Country extends Model
{
use \Staudenmeir\EloquentHasManyDeep\HasRelationships;
public function comments()
{
return $this->hasManyDeep('App\Comment', ['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.