Laravel Repository Pattern

This Laravel package simplifies and streamlines data access by implementing the repository pattern. It provides a powerful abstraction layer for your database interactions, enhanced with flexible filtering, searching, and criteria-based querying.

Features

• Repository Abstraction: Decouples data access logic from application code.
• Dynamic Filtering: Apply filters to refine database queries.
• Criteria-Based Filtering: Define reusable criteria for common query constraints.
• Search Functionality: Implement custom search logic based on user input.
• Modular Repository Interface: Enforces consistency and maintainability.
• Ease of Integration: Seamlessly integrates with Laravel applications.
• Development Tools: Automate repository, interface, and filter creation with the make:repository command.

Installation

To install the package, you can run the following command:

composer require salehhashemi/laravel-repository

Development Tools

The package includes a helpful command to speed up your development workflow:

• make:repository This command automates the creation of the following components for a specified model:

  • Repository Class
  • Repository Interface
  • Filter Class

Usage Example:

php artisan make:repository User 

or

php artisan make:repository App\Models\User 

Example Usage

Practical example of how to use this package to manage and interact with a Post model.

It includes examples of a custom repository, filter, criteria, and controller usage.

Post Repository

The PostRepository class extends BaseEloquentRepository and demonstrates the use of the package's features for a Post model.

<?php

namespace App\Repositories;

use App\Filters\PostFilter;
use App\Models\Post;
use App\Repositories\Criteria\FeaturedPostCriteria;
use Illuminate\Contracts\Pagination\Paginator;
use Illuminate\Database\Eloquent\Collection as EloquentCollection;
use Salehhashemi\Repository\BaseEloquentRepository;
use Salehhashemi\Repository\Traits\Searchable;

/**
 * @method \App\Models\Post getModel()
 * @method \App\Models\Post|null findOne(int|string $primaryKey = null)
 * @method \App\Models\Post findOneOrFail(int|string $primaryKey = null)
 */
class PostRepository extends BaseEloquentRepository implements PostRepositoryInterface
{
    use Searchable;

    protected function getFilterManager(): PostFilter
    {
        $filterManager = new PostFilter();
        $filterManager->setQuery($this->getQuery());

        return $filterManager;
    }

    public function findAllFeatured(): EloquentCollection
    {
        $this->addCriteria(new FeaturedPostCriteria());

        return $this->findAll(['limit' => 20]);
    }

    public function searchVisible(array $queryParams, int $perPage): Paginator
    {
        $this->orderBy('sort');
        $this->withCategories();

        return $this->search($queryParams, $perPage);
    }

    public function findOnePublishedOrFail(int $postId): Post
    {
        $this->applyConditions([
            'is_published' => 1,
        ]);

        return $this->findOneOrFail($postId);
    }

    public function withComments(): static
    {
        return $this->with(['comments']);
    }

    public function withCategories(): static
    {
        return $this->with(['categories']);
    }

    /**
     * {@inheritdoc}
     */
    protected function getModelClass(): string
    {
        return Post::class;
    }
}

Post Repository Interface

The PostRepositoryInterface defines the contract for our repository, ensuring consistency and clarity in method signatures.

<?php
declare(strict_types=1);

namespace App\Repositories;

use App\Models\Post;
use Illuminate\Contracts\Pagination\Paginator;
use Illuminate\Database\Eloquent\Collection as EloquentCollection;
use Salehhashemi\Repository\Contracts\RepositoryInterface;
use Salehhashemi\Repository\Contracts\SearchableRepositoryInterface;

/**
 * @method \App\Models\Post|null findOne(int|string $primaryKey = null)
 * @method \App\Models\Post findOneOrFail(int|string $primaryKey = null)
 */
interface PostRepositoryInterface extends RepositoryInterface, SearchableRepositoryInterface
{
    public function findAllFeatured(): EloquentCollection;

    public function searchVisible(array $queryParams, int $perPage): Paginator;

    public function findOnePublishedOrFail(int $postId): Post;

    /**
     * @return $this
     */
    public function withComments(): static;

    /**
     * @return $this
     */
    public function withCategories(): static;
}

Post Filter

PostFilter demonstrates how to apply custom filters to the Post model, enhancing query flexibility.

<?php
declare(strict_types=1);

namespace App\Filters;

use App\Models\Post;
use Illuminate\Database\Eloquent\Builder as QueryBuilder;
use Salehhashemi\Repository\BaseFilter;

class PostFilter extends BaseFilter
{
    public function applyFilter(array $queryParams): QueryBuilder
    {
        $this
            ->whereLike('title', $queryParams['title'] ?? '', self::WILD_BOTH)
            ->whereValue('status', $queryParams['status'] ?? '')
            ->compare('amount', '<=' $queryParams['max_amount'] ?? '')
            ->dateFrom('created_at', $queryParams['created_from'] ?? '')
            ->dateTo('created_at', $queryParams['created_to'] ?? '');

        if (! empty($queryParams['category_id'])) {
            $this->getQuery()->whereHas('categories', function ($query) use ($queryParams) {
                $query->where('categories.id', $queryParams['category_id']);
            });
        }

        return $this->getQuery();
    }
    
    protected function getModelClass(): string
    {
        return Post::class;
    }
}

Featured Post Criteria

The FeaturedPostCriteria is an example of defining criteria for filtering, here focusing on featured posts.

<?php

namespace App\Repositories\Criteria;

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Salehhashemi\Repository\Contracts\CriteriaInterface;

class FeaturedPostCriteria implements CriteriaInterface
{
    /**
     * {@inheritDoc}
     */
    public function apply(Model $model, Builder $query): Builder
    {
        $query->where([
            'posts.is_featured' => 1,
        ]);

        return $query;
    }
}

Binding Interface to Implementation

It is crucial to bind the repository interface to its concrete implementation. This enables Laravel service container to automatically resolve and inject the appropriate repository instance wherever it's needed.

1. Create a Service Provider

   php artisan make:provider RepositoryServiceProvider

2. Bind in the Service Provider

   <?php
   
   namespace App\Providers;
   
   use Illuminate\Support\ServiceProvider;
   use App\Repositories\PostRepositoryInterface;
   use App\Repositories\PostRepository;
   
   class RepositoryServiceProvider extends ServiceProvider
   {
       public function register()
       {
           $this->app->bind(
               PostRepositoryInterface::class,
               PostRepository::class
           );
       }
   }    

3. Register the Service Provider: Add your RepositoryServiceProvider to the providers array in config/app.php.

   'providers' => [
       // Other Service Providers
   
       App\Providers\RepositoryServiceProvider::class,
   ],

Repository Usage in controller

This example shows how to use the PostRepository within a controller, integrating it seamlessly into a Laravel application workflow.

public function index(Request $request, PostRepositoryInterface $postRepository): AnonymousResourceCollection
{
    return PostCollectionResource::collection(
        $postRepository
            ->search(
                $request->query(),
                $request->integer('limit'),
            )
    );
}

Available Methods

This package offers several methods:

findOne

Fetches a single model instance by primary key, or the first model matching applied criteria and relations.

$model = $repository->findOne($primaryKey);

findOneOrFail

Similar to findOne, but throws a ModelNotFoundException if no result is found.

$model = $repository->findOneOrFail($primaryKey);

findAll

Retrieves a collection of all models matching the applied criteria, relations, and specified options.

$models = $repository->findAll(['limit' => 10, 'offset' => 5]);

findList

Gets a collection of model values keyed by a specified field, useful for dropdown lists or similar displays.

$list = $repository->findList('id', 'name');

paginate

Returns a paginated collection of models based on applied criteria, relations, and specified page size.

$paginatedModels = $repository->paginate(15);

addCriteria

Adds a new criteria instance to the repository for query filtering.

$repository->addCriteria(new YourCustomCriteria());

orderBy

Specifies ordering for the query results based on field and direction.

$repository->orderBy('created_at', 'DESC');

lockForUpdate

Applies a "lock for update" clause to the query for handling concurrent database access.

$repository->lockForUpdate();

sharedLock

Applies a shared lock to the query, preventing modifications of selected rows.

$repository->sharedLock();

Configuration

To publish the config file, run the following command:

php artisan vendor:publish --provider="Salehhashemi\Repository\RepositoryServiceProvider" --tag="config"

After publishing, make sure to clear the config cache to apply your changes:

php artisan config:clear

Then, you can adjust the pagination limit in the config/repository.php

Exceptions

• InvalidArgumentException Thrown if page size is invalid.
• ModelNotFoundException Thrown if model not found.

Docker Setup

This project uses Docker for local development and testing. Make sure you have Docker and Docker Compose installed on your system before proceeding.

Build the Docker images

docker-compose build

Start the services

docker-compose up -d

To access the PHP container, you can use:

docker-compose exec php bash

Testing

composer test

Changelog

Please see CHANGELOG for more information what has changed recently.

Contributing

Please see CONTRIBUTING for details.

Credits

• Saleh Hashemi
• IMahmood
• All Contributors

License

The MIT License (MIT). Please see License File for more information.