Laravel Custom Query Builder

A custom query builder which allows projects to use Eloquent's builder on an application level. Define joins, filters, sorting and scopes with proper IntelliSense through a thin abstraction layer.

Installation

composer require lgrevelink/laravel-custom-query-builder

Configuration for Laravel

Laravel's auto-discovery directly registers the service provider so it should be instantly usable. If you don't use auto-discovery, please add the ServiceProvider to the provider array in config/app.php.

LGrevelink\CustomQueryBuilder\ServiceProvider::class

The artisan command is directly registered by adding the service provider. If you want to change the default configuration you can publish it through the following command;

php artisan vendor:publish --provider="LGrevelink\CustomQueryBuilder\ServiceProvider"

Configuration for Lumen

Using this package in lumen requires you to register the service provider in bootstrap/app.php.

$app->register(LGrevelink\CustomQueryBuilder\ServiceProvider::class);

The artisan command is directly registered by adding the service provider. If you want to change the default configuration you can publish it through the following command;

$app->configure('querybuilder');

Usage

Models use Eloquent's builder as a default when running operations from your model. This package allows you to override this default behaviour with a custom query builder which can be hosted in your project.

Create a new query builder (generator)

The package includes an artisan make command which configures an example builder at the given location. Simply run the following and you should have the builder;

php artisan make:query-builder MyQueryBuilder

Assigning a query builder

After creating the query builder we need to assign it to the model. The model needs to have the HasCustomQueryBuilder concern applied to it. This can be done by extending the LGrevelink\CustomQueryBuilder\Model instead of the Eloquent's model or adding the trait directly to the class. This only initiates a connection to the CustomQueryBuilder. To use your own you have to set it in the model;

class SomeModel extends Model
{
    use LGrevelink\CustomQueryBuilder\Concerns\HasCustomQueryBuilder;

    protected $queryBuilder = App\QueryBuilders\MyQueryBuilder::class;
}

Using the query builder

The default naming structures for filters and sorting are filterOn%s and sortBy%s where the placeholder will be replaced by a singular or plural version of the filter depending on the filter value. In case it's an array it attempts the plural version. Any other value will make use of the singular version. Below are some examples where each of the sets acts the same.

$builder = SomeModel::select();

// Using direct filters on the query builder
$builder->filterOnProperty(1234);
$builder->filterOnCategories([1, 2]);
$builder->sortByCategory('asc');
$builder->sortByTitle('asc');

// Enforcing the naming structure
$builder->applyFilter('property', 1234); // Calls filterOnProperty
$builder->applyFilter('category', [1, 2]); // Calls filterOnCategories
$builder->applySorting('category', 'asc'); // Calls sortByCategory
$builder->applySorting('title', 'asc'); // Calls sortByTitle

// Setting them in bulk
$builder->applyFilters([
    'property' => 1234,
    'category' => [1, 2],
); // Calls both filterOnProperty and filterOnCategories

$builder->applySorting([
    'category' => 'asc',
    'title' => 'asc',
]); // Calls both sortByCategory and sortByTitle

Global scopes directly from the builder

If you want to keep all database related data, including global scopes, in the query builder; you can! They are only added when the models dictate that they should be added but it keeps you from having to add these through the Model->boot functions.

class MyQueryBuilder extends CustomQueryBuilder
{
    protected $globalScopes = [
        MyScope::class,
    ];
}

Strict exceptions

In case a filter does not exist an exception will be thrown. There is a fallback for these cases which automatically applies a where or whereIn for unknown filters and applies an orderBy for unknown sortings. By default, the query builder's mode is set to strict and this behaviour is prevented. You can change this by overriding the querybuilder.mode config value and set it to auto. Be aware that this could have side-effects if the input is not validated properly.

Utilities

joinOnce

The joinOnce method can be used to join tables but prevent duplicates. It makes use of the \Illuminate\Database\Query\Builder's join method does a basic table validation before adding the join to the query. This way multiple joins on the same table can be prevented.

class ProductQueryBuilder extends CustomQueryBuilder
{
    public function joinCategories() {
        return $this->joinOnce('categories', 'categories.id', 'products.category_id');
    }

    public function filterOnCategoryStatus(string $status) {
        return $this->joinCategories()->where('categories.status', $status);
    }

    public function filterOnCategoryTitle(string $title) {
        return $this->joinCategories()->where('categories.title', 'LIKE', $title);
    }
}

In this case when filtering on status as well as title the join will only be forged once instead of multiple times.

Wildcard column qualifying

Using unqualified wildcards in select statements can have side-effects which are hard to find. When using joins, values of the original table can be overwritten by the joined tables when the column naming is the same. To prevent this behaviour we qualify the unqualified wildcards. In case the overwriting is the behaviour you seek, we suggest to specifically add the columns you want to the select statement. Instead of making it a side effect, it should be a deliberate choice the developer is aware of.

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