WordPress Query Builder v0.2.0

A fluent interface for creating WordPress Queries

Requirements

• PHP >= 7.2
• Composer
• WordPress 5.3.2

Installation

$ composer require jjgrainger/query

Usage

The Query class provides a fluent interface for create WP_Query in WordPress.

use Query\Query;

// Create a new WP_Query for the latest 3 products.
$results = Query::post_type( 'product' )->posts_per_page( 3 )->get();

// The above is the same as...
$args = [
    'post_type'      => 'product',
    'posts_per_page' => 3,
];

$results = new \WP_Query( $args );

Creating Custom Query Classes

Custom query classes can be created by extending the Query class. Custom query classes can encapsulate default parameters which can then be expanded upon with query methods.

For example, a FeaturedPostsQuery can be created to return posts with the 'featured' taxonomy term. The default query parameters are defined within the setup() method that receives a Builder instance.

use Query\Query;
use Query\Builder;

class FeaturedPostsQuery extends Query
{
    /**
     * Setup the initial query.
     *
     * @param  Builder $builder
     *
     * @return Builder
     */
    public function setup( Builder $builder ): Builder
    {
        // Setup a tax_query for posts with the 'featured' term.
        $tax_query = [
            [
                'taxonomy' => 'featured',
                'fields'   => 'slugs',
                'terms'    => [ 'featured' ],
            ],
        ];

        return $builder->where( 'tax_query', $tax_query );
    }
}

Once the query class is created it can be used through out the project in a vairety of ways.

use FeaturedPostsQuery as Featured;

// Returns a WP_Query object for posts with the featured term.
$results = Featured::get();

// Returns a WP_Query object for the latest 3 products with the featured term.
$results = Featured::type( 'products' )->limit( 3 )->get();

// Queries can be instantiated with an array of additional query arguments.
$args = [
    'post_type' => 'products',
];

// Create a query object.
$query = new Featured( $args );

// Modify the query and get the WP_Query object.
$results = $query->limit( 3 )->get();

Custom Scopes

Custom scopes can be added to the global Query using the static addScope method. One of the simplest ways to add a scope is with a closure.

// Create a new scope with a closure.
Query::addScope( 'events', function( Builder $builder ) {
    return $builder->where( 'post_type', 'event' );
} );

// Call the scope when needed.
$results = Query::events()->limit( 3 );

Custom Scope Classes

Custom scope classes can be added to the global Query. The custom scope class will need to implement the Scope interface and contain the required apply method. The apply method should accept the query Builder as the first argument and any optional arguments passed via the scope. Once added to the Query class the scope will be available by the class name with the first letter lowecase.

// Create a custom scope class.
use Query\Scope;
use Query\Builder;

class PostID implements Scope {
    public function apply( Builder $builder, $id = null ) {
        return $builder->where( 'p', $id );
    }
}

// Add the scope to the Query.
Query::addScope( new PostID );

// Use the scope in the Query.
$results = Query::postID( 123 )->get();

Notes

• The library is still in active development and not intended for production use.
• Licensed under the MIT License
• Maintained under the Semantic Versioning Guide

Author

Joe Grainger

• https://jjgrainger.co.uk
• https://twitter.com/jjgrainger