Create Admin Panel with Laravel Backpack

Create Admin Panel with Laravel Backpack - Part 4

Learn advanced features and customization options for your Laravel Backpack admin panel, including model relationships, file uploads, custom operations, filters, and validation rules.

Introduction

In this part of the series, we'll explore advanced features that will help you create a more powerful and customized admin panel. We'll cover relationships, file uploads, custom operations, and more.

Prerequisites

Completed Part 1 of this series
Basic understanding of Laravel relationships
Familiarity with file uploads in Laravel
Knowledge of Laravel validation

1 Working with Relationships

Let's add relationships to our Product model:

// One-to-Many Relationship
$this->crud->addField([
    'label' => 'Category',
    'type' => 'relationship',
    'name' => 'category_id',
    'entity' => 'category',
    'attribute' => 'name',
    'model' => 'App\\Models\\Category',
]);

// Many-to-Many Relationship
$this->crud->addField([
    'label' => 'Tags',
    'type' => 'relationship',
    'name' => 'tags',
    'entity' => 'tags',
    'attribute' => 'name',
    'model' => 'App\\Models\\Tag',
    'pivot' => true,
]);

2 File Uploads

Implement file uploads for product images:

$this->crud->addField([
    'name' => 'image',
    'label' => 'Product Image',
    'type' => 'image',
    'crop' => true,
    'aspect_ratio' => 1,
    'disk' => 'public',
    'prefix' => 'products/',
]);

3 Custom Operations

Add a custom operation to export products:

public function export()
{
    $this->crud->hasAccessOrFail('list');
    
    $products = $this->crud->model->all();
    
    $csv = \League\Csv\Writer::createFromString('');
    $csv->insertOne(['ID', 'Name', 'Price', 'Stock']);
    
    foreach ($products as $product) {
        $csv->insertOne([
            $product->id,
            $product->name,
            $product->price,
            $product->stock,
        ]);
    }
    
    return response($csv->toString())
        ->header('Content-Type', 'text/csv')
        ->header('Content-Disposition', 'attachment; filename="products.csv"');
}

4 Custom Filters

Add a price range filter to the list view:

$this->crud->addFilter([
    'name' => 'price_range',
    'type' => 'range',
    'label' => 'Price Range',
    'label_from' => 'Min',
    'label_to' => 'Max',
    'field_name' => 'price',
    'from' => 'min_price',
    'to' => 'max_price',
]);

5 Custom Validation Rules

Implement custom validation for SKU uniqueness:

$this->crud->setValidation([
    'sku' => 'required|unique:products,sku,' . $this->crud->getCurrentEntryId(),
    'name' => 'required|min:3',
    'price' => 'required|numeric|min:0',
    'stock' => 'required|integer|min:0',
]);

Key Features Covered

Model relationships (one-to-many and many-to-many)
File uploads with image cropping
Custom CRUD operations
Advanced filtering options
Custom validation rules

Best Practices

Use eager loading for relationships to prevent N+1 queries
Implement proper file validation and sanitization
Add helpful error messages for validation rules
Use appropriate field types for your data
Implement proper access control for custom operations

Common Issues

File upload permissions and disk configuration
Relationship performance with large datasets
Validation rule conflicts
Custom operation security considerations

Create Admin Panel with Laravel Backpack - Part 4