1. Requirements
2. Installation
3. Usage
4. HasNestedMany Field
   1. DependsOn
   2. Propagate
   3. Default Children
   4. Additional options
   5. Hooks
5. Nestable Resource
   1. Nestable Title
   2. Nestable Custom Validation
   3. Nestable Authorization
   4. Nestable Actions
      1. Nestable Basic Actions
      2. Nestable Soft Delete Action
      3. Nestable Custom Actions
      4. Difference With Nova Actions
      5. Nested Object
6. Recursivity
7. Changelog
8. Credits

Requirements

• php: ^7.4 | ^8
• laravel/nova: ^4

Installation

composer require lupennat/nova-nested-many:^2.0

Usage

Register Trait HasNestedResource globally on Resources.

namespace App\Nova;

use Laravel\Nova\Resource as NovaResource;
use Lupennat\NestedMany\HasNestedResource;

abstract class Resource extends NovaResource
{
    use HasNestedResource;
}

Use HasManyNested Field like HasMany

namespace App\Nova;

use Laravel\Nova\Fields\ID;
use Illuminate\Http\Request;
use Laravel\Nova\Fields\Text;
use Laravel\Nova\Fields\Gravatar;
use Laravel\Nova\Fields\Password;
// Add use statement here.
use Lupennat\NestedMany\Fields\HasManyNested;

class User extends Resource
{

    public function fields(Request $request)
    {
        return [
            ID::make()->sortable(),

            Gravatar::make(),

            Text::make('Name')
                ->sortable()
                ->rules('required', 'max:255'),

            Text::make('Email')
                ->sortable()
                ->rules('required', 'email', 'max:254')
                ->creationRules('unique:users,email')
                ->updateRules('unique:users,email,{{resourceId}}'),

            Password::make('Password')
                ->onlyOnForms()
                ->creationRules('required', 'string', 'min:6')
                ->updateRules('nullable', 'string', 'min:6'),

            // Add HasManyNested here.
            HasManyNested::make('Posts'),
        ];
    }

}

HasManyNested is visible by deafult on DetailPage, UpdatePage and CreatePage. HasManyNested is not available on IndexPage.

Implements contract Nestable and use trait HasNested for every related model that will be used with HasNestedMany.

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Lupennat\NestedMany\Models\Contracts\Nestable;
use Lupennat\NestedMany\Models\HasNested;

class Post extends Model implements Nestable
{
    use HasNested;

}

HasNestedMany Field

Depends On

HasNestedMany Field support Nova dependsOn.

HasNestedMany::make('Posts', Post::class)
    ->dependsOn('name', function(HasNestedMany $field, NovaRequest $novaRequest, FormData $formData) {
        if ($formData->name === 'xxx') {
            $field->show();
        } else {
            $field->hide();
        }
    })

Propagate

HasNestedMany Field can propagate parent field value to related resource.

HasNestedMany::make('Posts', Post::class)->propagate(['name'])

// you can also propagate custom key/value to related resource.
HasNestedMany::make('Posts', Post::class)->propagate(['not_a_field' => 'test'])

On related resource propagated fields can be retrieved through getNestedPropagated method on Request

namespace App\Nova;

use Laravel\Nova\Fields\ID;
use Laravel\Nova\Fields\BelongsTo;
use Laravel\Nova\Fields\Select;
use Laravel\Nova\Fields\Text;
use Laravel\Nova\Http\Requests\NovaRequest;

class Post extends Resource
{

    public function fields(NovaRequest $request)
    {
        return array_filter([
            ID::make(),
            BelongsTo::make(__('User'), 'user', User::class),
            Select::section(__('Section'), 'section')
                ->options(['sport' => 'Sport', 'news' => 'News'])
                ->rules('required'),
            Text::title(__('Title'), 'title')
                ->rules('required'),
            $request->getNestedPropagated('name') === 'xxx' ?
                Text::make(__('Extra Field'), 'extra')->hide() : null
        ]);
    }

}

Default Children

You can use defaultChildren method to generate a default set of related resource when children are empty.

defaultChildren works only on Create Page.

HasNestedMany::make('Posts', Post::class)
    ->defaultChildren([
        ['title' => 'first post', 'section' => 'sport'],
        ['title' => 'second post', 'section' => 'news'],
    ])

if you want to overwrite existing children you can use

HasNestedMany::make('Posts', Post::class)
    ->defaultChildren([
        ['title' => 'first post', 'section' => 'sport'],
        ['title' => 'second post', 'section' => 'news'],
    ], true)

Additional options

Hooks

You can specify callbacks before and after HasNestedMany fill the database.

namespace App\Nova;

use Illuminate\Http\Request;
use Lupennat\NestedMany\Fields\HasManyNested;
use Laravel\Nova\Http\Requests\NovaRequest;

class User extends Resource
{

    public function fields(Request $request)
    {
        return [
            HasNestedMany::make('Posts', Post::class)
                ->beforeFill(function(\App\Models\User $user, NovaRequest $request) {
                    // do stuff
                })
                ->afterFill(function(\App\Models\User $user, NovaRequest $request) {
                    // do stuff
                })
        ];
    }

}

Nestable Resource

Resource trait HasNestedResource, provide new functionality related to Nested.

Nestable Title

Both panel and tab views, use nestedTitle method to retrieve the title of the resource.

if method not found it will fallback to original nova resource title

namespace App\Nova;

class User extends Resource
{

    public function nestedTitle()
    {
        return $this->resource->name;
    }

}

Nestable Custom Validation

Field validation on nestable resources are automatically managed by NestedMany, for each validation error the attribute key is reprocessed and mapped to show feedback to the user in the specific field of the resource generating the error.

When validation is done by adding errors in the validator (e.g., using the afterValidation method), HasManyNested is unable to intercept and remap these errors. On related resource the correct prefix to prepend to the error attribute can be retrieved through getNestedValidationKeyPrefix method on Request.

namespace App\Nova;

class User extends Resource
{
    /**
     * Handle any post-validation processing.
     *
     * @param \Illuminate\Validation\Validator $validator
     *
     * @return void
     */
    protected static function afterValidation(NovaRequest $request, $validator)
    {
        // do logic to detect error
        $isDisposableEmail = true;
        if($isDisposableEmail) {
            $validator
                ->errors()
                ->add(
                    $request->getNestedValidationKeyPrefix() . 'email',
                    'Temporary emails are forbidden.'
                );
        }
    }

Nestable Authorization

Nested Many will use laravel nova resource authorizations for create/update/delete. You can define different policies only for Nested Many within 3 new methods

namespace App\Nova;

class User extends Resource
{

    public static function authorizedToCreateNested(Request $request)
    {
        return true;
    }

    public function authorizedToUpdateNested(Request $request)
    {
        return false;
    }

    public function authorizedToDeleteNested(Request $request)
    {
        return $this->authorizedToDelete($request);
    }

}

Nestable Actions

You can define Nested Actions to manipulate related content through the server.\

Nested Actions can keep the modal open after action is run through the property $keepOpened or the method keepOpened().

Nestable Basic actions

By Default NestedMany has 3 Basic actions NestedBasicAddAction, NestedBasicDeleteAction, NestedBasicRestoreAction, and it is possible to customize them through 3 methods on resource.

namespace App\Nova;

use Lupennat\NestedMany\Actions\Basics\NestedBasicAddAction;
use Lupennat\NestedMany\Actions\Basics\NestedBasicDeleteAction;
use Lupennat\NestedMany\Actions\Basics\NestedBasicRestoreAction;
use Laravel\Nova\Http\Requests\NovaRequest;

class Post extends Resource
{

    /**
     * Get the nested create action on the entity.
     */
    public function nestedAddAction(NovaRequest $request): NestedBasicAddAction
    {
        return new \App\Nova\NestedActions\MyCustomAddActionExtendsBasicAddAction();
    }

    /**
     * Get the nested delete action on the entity.
     */
    public function nestedDeleteAction(NovaRequest $request): NestedBasicDeleteAction
    {
        return parent::nestedDeleteAction($request)->withConfirmation();
    }

    /**
     * Get the nested delete action on the entity.
     */
    public function nestedRestoreAction(NovaRequest $request): NestedBasicRestoreAction
    {
        return parent::nestedRestoreAction($request)->withConfirmation();
    }

}

Nestable Soft Delete Action

NestedDeleteAction automatically support softDelete logic (is not a real elouquent softDelete), to enable softdelete/restore logic you need to set protected $nestedHasSoftDelete = true on the related model.

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Lupennat\NestedMany\Models\Contracts\Nestable;
use Lupennat\NestedMany\Models\HasNested;

class Post extends Model implements Nestable
{
    use HasNested;

    protected $nestedHasSoftDelete = true;

}

Nestable Custom actions

Nested actions may be generated using the nested-many:action Artisan command. By default, all actions are placed in the app/Nova/NestedActions directory:

php artisan nested-many:action DuplicatePost

You may generate a destructive action by passing the --destructive option:

php artisan nested-many:action DeleteAllPosts --destructive

Nested Actions have a lot in common with Nova Actions, the main difference is that handle method should always return a collection of NestedObject.

You can generate new NestedObject with method $this->getNewNested().

To learn how to define Nova actions, let's look at an example. In this example, we'll define an action that will duplicate a post:

<?php

namespace App\Nova\NestedActions;

use Illuminate\Support\Collection;
use Laravel\Nova\Fields\ActionFields;
use Laravel\Nova\Http\Requests\NovaRequest;
use Lupennat\NestedMany\Models\Nested;
use Lupennat\NestedMany\Actions\NestedAction;

class DuplicatePost extends NestedAction
{

    /**
     * Handle any post-validation processing.
     *
     * @param \Illuminate\Contracts\Validation\Validator $validator
     * @param \Illuminate\Support\Collection<int,\Lupennat\NestedMany\Models\Nested> $resources
     *
     * @return void
     */
    protected function afterValidation(NovaRequest $request, Collection $resources, $validator)
    {
       // do validation stuff
    }


    /**
     * Perform the action on the given models.
     *
     * @param \Laravel\Nova\Fields\ActionFields $actionFields
     * @param \Illuminate\Support\Collection<int,\Lupennat\NestedMany\Models\Nested> $children
     * @param string|null $selectedUid
     *
     * @return \Illuminate\Support\Collection<int,\Lupennat\NestedMany\Models\Nested>
     */
    public function handle(ActionFields $fields, Collection $children, $selectedUid): Collection
    {
        $selectedNested = $children->where(Nested::UIDFIELD, $selectedUid)->first();

        $children->push(tap($this->getNewNested(), function ($newResource) use ($selectedNested, $fields) {
            foreach ($selectedNested->getAttributes() as $key => $value) {
                if($key !== $selectedNested->getKeyName()) {
                    $newResource->{$key} = $value;
                }
            }
            $newResource->active();
        }));

        return $children;
    }

    /**
     * Get the fields available on the action.
     *
     * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
     * @return array
     */
    public function fields(NovaRequest $request)
    {
        return [];
    }
}

You can register custom NestedActions within your resource throught the method nestedActions

namespace App\Nova;

use Lupennat\NestedMany\Actions\Basics\NestedBasicAddAction;

class Post extends Resource
{
    /**
     * Get the actions available on the entity.
     *
     * @return array<\Lupennat\NestedMany\Actions\NestedAction>
     */
    public function nestedActions(NovaRequest $request): array
    {
        return [
            \App\Nova\NestedActions\DuplicatePost::create()
        ];
    }
}

Nested Object

When using NestedActions, all Eloquent models are wrapped by default in the Nested class that extends Laravel Fluent class.
All Model attributes are replicated on Nested attributes, that way you can modify attributes values directly to the Nested object.

It expose convinient methods to manipulate object without executing queries against the database.

When toModel is called, Nested class apply changes on current object to Original Eloquent Model if Mutators are registered, they will be executed.

Every change executed on Nested Object will not be stored on database until the user click the Create/Update button on the Parent Form Page.

Recursivity

HasManyNested supports recursivity however, it is important to keep in mind that the deletion of a "parent" resource is not recursive to its "children".

Ex. parent resource -> nested resourceA -> nested resourceB

by deleting a nested resource A the nested resources B are not automatically deleted from the database.

You can solve this problem by directly using observers for the delete event on eloquent models.

class Parent extends Model {
    protected static function booted(): void
    {
        static::deleted(function (Parent $model) {
            // to propagate event we need to call ->delete() within the model
            foreach ($model->childrenItemA as $childItemA) {
                $childItemA->delete();
            }
        });
    }

    public childrenItemA() {
        return $this->hasMany(ItemA::class);
    }
}

class ItemA extends Model {

    protected static function booted(): void {
        static::deleted(function (ItemA $model) {
            // we can avoid loop we don't need to propagate event
           $model->childrenItemB()->delete()
        });
    }

    public childrenItemB() {
        return $this->hasMany(ItemB::class);
    }
}

class ItemB extends Model {
}

Nestable Objects with Recursivity

Recursive HasManyNested relations, are available within the children collection of NestedActions, relations are array of Nested Object. You can generate new relation NestedObject with method $this->getNewNested('relationName').

Credits

NestedForm field is based on original Nova Nested Form.