lightspeeddevelopment / lsx

includes/classes/class-lsx-schema-graph-piece.php

Indentation +217 added lines, -217 removed lines

@@ -12,221 +12,221 @@
 use \Yoast\WP\SEO\Generators\Schema\Abstract_Schema_Piece;
 
 if ( class_exists( 'Abstract_Schema_Piece' ) ) {
-	class LSX_Schema_Graph_Piece extends Abstract_Schema_Piece {
-		/**
-		 * A value object with context variables.
-		 *
-		 * @var \WPSEO_Schema_Context
-		 */
-		public $context;
-		/**
-		 * This is the post type that you want the piece to output for.
-		 *
-		 * @var string;
-		 */
-		public $post_type;
-		/**
-		 * If this is a top level parent
-		 *
-		 * @var boolean
-		 */
-		public $is_top_level;
-		/**
-		 * This holds the meta_key => scehma_type of the fields you want to add to your subtrip.
-		 *
-		 * @var array()
-		 */
-		public $place_ids;
-		/**
-		 * This holds an object or the current trip post.
-		 *
-		 * @var WP_Post();
-		 */
-		public $post;
-		/**
-		 * This holds URL for the trip
-		 *
-		 * @var string
-		 */
-		public $post_url;
-		/**
-		 * Constructor.
-		 *
-		 * @param \WPSEO_Schema_Context $context A value object with context variables.
-		 */
-		public function __construct( WPSEO_Schema_Context $context ) {
-			$this->context      = $context;
-			$this->place_ids    = array();
-			$this->post         = get_post( $this->context->id );
-			$this->post_url     = get_permalink( $this->context->id );
-			$this->is_top_level = false;
-			if ( is_object( $this->post ) && isset( $this->post->post_parent ) && ( false === $this->post->post_parent || 0 === $this->post->post_parent || '' === $this->post->post_parent ) ) {
-				$this->is_top_level = true;
-			}
-		}
-		/**
-		 * Determines whether or not a piece should be added to the graph.
-		 *
-		 * @return bool
-		 */
-		public function is_needed() {
-			if ( ! is_singular() ) {
-				return false;
-			}
-			if ( false === $this->context->site_represents ) {
-				return false;
-			}
-			return LSX_Schema_Utils::is_type( get_post_type(), $this->post_type );
-		}
-		/**
-		 * Returns Review data.
-		 *
-		 * @return array $data Review data.
-		 */
-		public function generate() {
-			$data = array();
-			return $data;
-		}
-		/**
-		 * Gets the connected reviews post type and set it as the "Review" schema
-		 *
-		 * @param  array    $data An array of offers already added.
-		 * @param  string   $data_key
-		 * @param  boolean  $include_aggregate
-		 * @return array    $data
-		 */
-		public function add_reviews( $data, $data_key = 'reviews', $include_aggregate = true ) {
-			$reviews       = get_post_meta( $this->context->id, 'review_to_' . $this->post_type, false );
-			$reviews_array = array();
-			if ( ! empty( $reviews ) ) {
-				$aggregate_value = 1;
-				$review_count    = 0;
-				foreach ( $reviews as $review_id ) {
-					$rating      = get_post_meta( $review_id, 'rating', true );
-					$author      = get_post_meta( $review_id, 'reviewer_name', true );
-					$description = wp_strip_all_tags( get_the_excerpt( $review_id ) );
-					$review_args = array(
-						'author'     => $author,
-						'reviewBody' => $description,
-					);
-					// Add in the review rating.
-					if ( false !== $rating && '' !== $rating && '0' !== $rating && 0 !== $rating ) {
-						$review_args['reviewRating'] = array(
-							'@type'       => 'Rating',
-							'ratingValue' => $rating,
-						);
-					}
-					$reviews_array = LSX_Schema_Utils::add_review( $reviews_array, $review_id, $this->context, $review_args );
-					$review_count++;
-				}
-				if ( ! empty( $reviews_array ) ) {
-					if ( true === $include_aggregate ) {
-						$data['aggregateRating'] = array(
-							'@type'       => 'AggregateRating',
-							'ratingValue' => (string) $aggregate_value,
-							'reviewCount' => (string) $review_count,
-							'bestRating'  => '5',
-							'worstRating' => '1',
-						);
-					}
-					$data[ $data_key ] = $reviews_array;
-				}
-			}
-			return $data;
-		}
-		/**
-		 * Gets the connected posts and set it as the "Article" schema
-		 *
-		 * @param  array  $data An array of offers already added.
-		 * @param  string $data_key
-		 * @return array  $data
-		 */
-		public function add_articles( $data, $data_key = 'subjectOf' ) {
-			$posts       = get_post_meta( $this->context->id, 'post_to_' . $this->post_type, false );
-			$posts_array = array();
-			if ( ! empty( $posts ) ) {
-				foreach ( $posts as $post_id ) {
-					$post_args = array(
-						'articleBody' => wp_strip_all_tags( get_the_excerpt( $post_id ) ),
-						'headline'    => get_the_title( $post_id ),
-					);
-					$section   = get_the_term_list( $post_id, 'category' );
-					if ( ! is_wp_error( $section ) && '' !== $section && false !== $section ) {
-						$post_args['articleSection'] = wp_strip_all_tags( $section );
-					}
-					if ( $this->context->site_represents_reference ) {
-						$post_args['publisher'] = $this->context->site_represents_reference;
-					}
-					$image_url = get_the_post_thumbnail_url( $post_id, 'lsx-thumbnail-wide' );
-					if ( false !== $image_url ) {
-						$post_args['image'] = $image_url;
-					}
-					$posts_array = LSX_Schema_Utils::add_article( $posts_array, $post_id, $this->context, $post_args );
-				}
-				if ( ! empty( $posts_array ) ) {
-					$data[ $data_key ] = $posts_array;
-				}
-			}
-			return $data;
-		}
-		/**
-		 * Adds the Project and Testimonials attached to the Team Member
-		 *
-		 * @param array $data
-		 *
-		 * @return array $data
-		 */
-		public function add_connections( $data ) {
-			$connections_array = array();
-			if ( $this->is_top_level ) {
-				$connections_array = $this->add_regions( $connections_array );
-				$connections_array = $this->add_accommodation( $connections_array );
-				if ( ! empty( $connections_array ) ) {
-					$data['containsPlace'] = $connections_array;
-				}
-			} else {
-				$connections_array             = $this->add_countries( $connections_array );
-				$data['containedInPlace'] = $connections_array;
-				$connections_array          = array();
-				$connections_array          = $this->add_accommodation( $connections_array );
-				$data['containsPlace'] = $connections_array;
-			}
-			return $data;
-		}
-		/**
-		 * Adds the terms for the taxonomy
-		 *
-		 * @param array $data     Review data.
-		 * @param array $data_key the parameter name you wish to assign it to.
-		 * @param array $taxonomy the taxonomy to grab terms for.
-		 *
-		 * @return array $data Review data.
-		 */
-		public function add_taxonomy_terms( $data, $data_key, $taxonomy ) {
-			/**
-			 * Filter: 'lsx_schema_' . $this->post_type . '_' . $data_key . '_taxonomy' - Allow changing the taxonomy used to assign keywords to a post type Review data.
-			 *
-			 * @api string $taxonomy The chosen taxonomy.
-			 */
-			$taxonomy = apply_filters( 'lsx_schema_' . $this->post_type . '_' . $data_key . '_taxonomy', $taxonomy );
-			return LSX_Schema_Utils::add_terms( $data, $this->context->id, $data_key, $taxonomy );
-		}
-		/**
-		 * Adds the custom field value for the supplied key
-		 *
-		 * @param array   $data     Schema data.
-		 * @param string  $data_key the parameter name you wish to assign it to.
-		 * @param string  $meta_key the taxonomy to grab terms for.
-		 * @param boolean $single   A single custom field or an array
-		 *
-		 * @return array $data Review data.
-		 */
-		public function add_custom_field( $data, $data_key, $meta_key, $single = true ) {
-			$value = get_post_meta( $this->context->id, $meta_key, $single );
-			if ( '' !== $value && false !== $value ) {
-				$data[ $data_key ] = $value;
-			}
-			return $data;
-		}
-	}
+     class LSX_Schema_Graph_Piece extends Abstract_Schema_Piece {
+          /**
+           * A value object with context variables.
+           *
+           * @var \WPSEO_Schema_Context
+           */
+          public $context;
+          /**
+           * This is the post type that you want the piece to output for.
+           *
+           * @var string;
+           */
+          public $post_type;
+          /**
+           * If this is a top level parent
+           *
+           * @var boolean
+           */
+          public $is_top_level;
+          /**
+           * This holds the meta_key => scehma_type of the fields you want to add to your subtrip.
+           *
+           * @var array()
+           */
+          public $place_ids;
+          /**
+           * This holds an object or the current trip post.
+           *
+           * @var WP_Post();
+           */
+          public $post;
+          /**
+           * This holds URL for the trip
+           *
+           * @var string
+           */
+          public $post_url;
+          /**
+           * Constructor.
+           *
+           * @param \WPSEO_Schema_Context $context A value object with context variables.
+           */
+          public function __construct( WPSEO_Schema_Context $context ) {
+               $this->context      = $context;
+               $this->place_ids    = array();
+               $this->post         = get_post( $this->context->id );
+               $this->post_url     = get_permalink( $this->context->id );
+               $this->is_top_level = false;
+               if ( is_object( $this->post ) && isset( $this->post->post_parent ) && ( false === $this->post->post_parent || 0 === $this->post->post_parent || '' === $this->post->post_parent ) ) {
+                    $this->is_top_level = true;
+               }
+          }
+          /**
+           * Determines whether or not a piece should be added to the graph.
+           *
+           * @return bool
+           */
+          public function is_needed() {
+               if ( ! is_singular() ) {
+                    return false;
+               }
+               if ( false === $this->context->site_represents ) {
+                    return false;
+               }
+               return LSX_Schema_Utils::is_type( get_post_type(), $this->post_type );
+          }
+          /**
+           * Returns Review data.
+           *
+           * @return array $data Review data.
+           */
+          public function generate() {
+               $data = array();
+               return $data;
+          }
+          /**
+           * Gets the connected reviews post type and set it as the "Review" schema
+           *
+           * @param  array    $data An array of offers already added.
+           * @param  string   $data_key
+           * @param  boolean  $include_aggregate
+           * @return array    $data
+           */
+          public function add_reviews( $data, $data_key = 'reviews', $include_aggregate = true ) {
+               $reviews       = get_post_meta( $this->context->id, 'review_to_' . $this->post_type, false );
+               $reviews_array = array();
+               if ( ! empty( $reviews ) ) {
+                    $aggregate_value = 1;
+                    $review_count    = 0;
+                    foreach ( $reviews as $review_id ) {
+                         $rating      = get_post_meta( $review_id, 'rating', true );
+                         $author      = get_post_meta( $review_id, 'reviewer_name', true );
+                         $description = wp_strip_all_tags( get_the_excerpt( $review_id ) );
+                         $review_args = array(
+                              'author'     => $author,
+                              'reviewBody' => $description,
+                         );
+                         // Add in the review rating.
+                         if ( false !== $rating && '' !== $rating && '0' !== $rating && 0 !== $rating ) {
+                              $review_args['reviewRating'] = array(
+                                   '@type'       => 'Rating',
+                                   'ratingValue' => $rating,
+                              );
+                         }
+                         $reviews_array = LSX_Schema_Utils::add_review( $reviews_array, $review_id, $this->context, $review_args );
+                         $review_count++;
+                    }
+                    if ( ! empty( $reviews_array ) ) {
+                         if ( true === $include_aggregate ) {
+                              $data['aggregateRating'] = array(
+                                   '@type'       => 'AggregateRating',
+                                   'ratingValue' => (string) $aggregate_value,
+                                   'reviewCount' => (string) $review_count,
+                                   'bestRating'  => '5',
+                                   'worstRating' => '1',
+                              );
+                         }
+                         $data[ $data_key ] = $reviews_array;
+                    }
+               }
+               return $data;
+          }
+          /**
+           * Gets the connected posts and set it as the "Article" schema
+           *
+           * @param  array  $data An array of offers already added.
+           * @param  string $data_key
+           * @return array  $data
+           */
+          public function add_articles( $data, $data_key = 'subjectOf' ) {
+               $posts       = get_post_meta( $this->context->id, 'post_to_' . $this->post_type, false );
+               $posts_array = array();
+               if ( ! empty( $posts ) ) {
+                    foreach ( $posts as $post_id ) {
+                         $post_args = array(
+                              'articleBody' => wp_strip_all_tags( get_the_excerpt( $post_id ) ),
+                              'headline'    => get_the_title( $post_id ),
+                         );
+                         $section   = get_the_term_list( $post_id, 'category' );
+                         if ( ! is_wp_error( $section ) && '' !== $section && false !== $section ) {
+                              $post_args['articleSection'] = wp_strip_all_tags( $section );
+                         }
+                         if ( $this->context->site_represents_reference ) {
+                              $post_args['publisher'] = $this->context->site_represents_reference;
+                         }
+                         $image_url = get_the_post_thumbnail_url( $post_id, 'lsx-thumbnail-wide' );
+                         if ( false !== $image_url ) {
+                              $post_args['image'] = $image_url;
+                         }
+                         $posts_array = LSX_Schema_Utils::add_article( $posts_array, $post_id, $this->context, $post_args );
+                    }
+                    if ( ! empty( $posts_array ) ) {
+                         $data[ $data_key ] = $posts_array;
+                    }
+               }
+               return $data;
+          }
+          /**
+           * Adds the Project and Testimonials attached to the Team Member
+           *
+           * @param array $data
+           *
+           * @return array $data
+           */
+          public function add_connections( $data ) {
+               $connections_array = array();
+               if ( $this->is_top_level ) {
+                    $connections_array = $this->add_regions( $connections_array );
+                    $connections_array = $this->add_accommodation( $connections_array );
+                    if ( ! empty( $connections_array ) ) {
+                         $data['containsPlace'] = $connections_array;
+                    }
+               } else {
+                    $connections_array             = $this->add_countries( $connections_array );
+                    $data['containedInPlace'] = $connections_array;
+                    $connections_array          = array();
+                    $connections_array          = $this->add_accommodation( $connections_array );
+                    $data['containsPlace'] = $connections_array;
+               }
+               return $data;
+          }
+          /**
+           * Adds the terms for the taxonomy
+           *
+           * @param array $data     Review data.
+           * @param array $data_key the parameter name you wish to assign it to.
+           * @param array $taxonomy the taxonomy to grab terms for.
+           *
+           * @return array $data Review data.
+           */
+          public function add_taxonomy_terms( $data, $data_key, $taxonomy ) {
+               /**
+                * Filter: 'lsx_schema_' . $this->post_type . '_' . $data_key . '_taxonomy' - Allow changing the taxonomy used to assign keywords to a post type Review data.
+                *
+                * @api string $taxonomy The chosen taxonomy.
+                */
+               $taxonomy = apply_filters( 'lsx_schema_' . $this->post_type . '_' . $data_key . '_taxonomy', $taxonomy );
+               return LSX_Schema_Utils::add_terms( $data, $this->context->id, $data_key, $taxonomy );
+          }
+          /**
+           * Adds the custom field value for the supplied key
+           *
+           * @param array   $data     Schema data.
+           * @param string  $data_key the parameter name you wish to assign it to.
+           * @param string  $meta_key the taxonomy to grab terms for.
+           * @param boolean $single   A single custom field or an array
+           *
+           * @return array $data Review data.
+           */
+          public function add_custom_field( $data, $data_key, $meta_key, $single = true ) {
+               $value = get_post_meta( $this->context->id, $meta_key, $single );
+               if ( '' !== $value && false !== $value ) {
+                    $data[ $data_key ] = $value;
+               }
+               return $data;
+          }
+     }
 }

Spacing +49 added lines, -49 removed lines

@@ -11,7 +11,7 @@ 
  */
 use \Yoast\WP\SEO\Generators\Schema\Abstract_Schema_Piece;
 
-if ( class_exists( 'Abstract_Schema_Piece' ) ) {
+if (class_exists('Abstract_Schema_Piece')) {
 	class LSX_Schema_Graph_Piece extends Abstract_Schema_Piece {
 		/**
 		 * A value object with context variables.
@@ -54,13 +54,13 @@ 
 		 *
 		 * @param \WPSEO_Schema_Context $context A value object with context variables.
 		 */
-		public function __construct( WPSEO_Schema_Context $context ) {
+		public function __construct(WPSEO_Schema_Context $context) {
 			$this->context      = $context;
 			$this->place_ids    = array();
-			$this->post         = get_post( $this->context->id );
-			$this->post_url     = get_permalink( $this->context->id );
+			$this->post         = get_post($this->context->id);
+			$this->post_url     = get_permalink($this->context->id);
 			$this->is_top_level = false;
-			if ( is_object( $this->post ) && isset( $this->post->post_parent ) && ( false === $this->post->post_parent || 0 === $this->post->post_parent || '' === $this->post->post_parent ) ) {
+			if (is_object($this->post) && isset($this->post->post_parent) && (false === $this->post->post_parent || 0 === $this->post->post_parent || '' === $this->post->post_parent)) {
 				$this->is_top_level = true;
 			}
 		}
@@ -70,13 +70,13 @@ 
 		 * @return bool
 		 */
 		public function is_needed() {
-			if ( ! is_singular() ) {
+			if ( ! is_singular()) {
 				return false;
 			}
-			if ( false === $this->context->site_represents ) {
+			if (false === $this->context->site_represents) {
 				return false;
 			}
-			return LSX_Schema_Utils::is_type( get_post_type(), $this->post_type );
+			return LSX_Schema_Utils::is_type(get_post_type(), $this->post_type);
 		}
 		/**
 		 * Returns Review data.
@@ -95,32 +95,32 @@ 
 		 * @param  boolean  $include_aggregate
 		 * @return array    $data
 		 */
-		public function add_reviews( $data, $data_key = 'reviews', $include_aggregate = true ) {
-			$reviews       = get_post_meta( $this->context->id, 'review_to_' . $this->post_type, false );
+		public function add_reviews($data, $data_key = 'reviews', $include_aggregate = true) {
+			$reviews       = get_post_meta($this->context->id, 'review_to_' . $this->post_type, false);
 			$reviews_array = array();
-			if ( ! empty( $reviews ) ) {
+			if ( ! empty($reviews)) {
 				$aggregate_value = 1;
 				$review_count    = 0;
-				foreach ( $reviews as $review_id ) {
-					$rating      = get_post_meta( $review_id, 'rating', true );
-					$author      = get_post_meta( $review_id, 'reviewer_name', true );
-					$description = wp_strip_all_tags( get_the_excerpt( $review_id ) );
+				foreach ($reviews as $review_id) {
+					$rating      = get_post_meta($review_id, 'rating', true);
+					$author      = get_post_meta($review_id, 'reviewer_name', true);
+					$description = wp_strip_all_tags(get_the_excerpt($review_id));
 					$review_args = array(
 						'author'     => $author,
 						'reviewBody' => $description,
 					);
 					// Add in the review rating.
-					if ( false !== $rating && '' !== $rating && '0' !== $rating && 0 !== $rating ) {
+					if (false !== $rating && '' !== $rating && '0' !== $rating && 0 !== $rating) {
 						$review_args['reviewRating'] = array(
 							'@type'       => 'Rating',
 							'ratingValue' => $rating,
 						);
 					}
-					$reviews_array = LSX_Schema_Utils::add_review( $reviews_array, $review_id, $this->context, $review_args );
+					$reviews_array = LSX_Schema_Utils::add_review($reviews_array, $review_id, $this->context, $review_args);
 					$review_count++;
 				}
-				if ( ! empty( $reviews_array ) ) {
-					if ( true === $include_aggregate ) {
+				if ( ! empty($reviews_array)) {
+					if (true === $include_aggregate) {
 						$data['aggregateRating'] = array(
 							'@type'       => 'AggregateRating',
 							'ratingValue' => (string) $aggregate_value,
@@ -129,7 +129,7 @@ 
 							'worstRating' => '1',
 						);
 					}
-					$data[ $data_key ] = $reviews_array;
+					$data[$data_key] = $reviews_array;
 				}
 			}
 			return $data;
@@ -141,30 +141,30 @@ 
 		 * @param  string $data_key
 		 * @return array  $data
 		 */
-		public function add_articles( $data, $data_key = 'subjectOf' ) {
-			$posts       = get_post_meta( $this->context->id, 'post_to_' . $this->post_type, false );
+		public function add_articles($data, $data_key = 'subjectOf') {
+			$posts       = get_post_meta($this->context->id, 'post_to_' . $this->post_type, false);
 			$posts_array = array();
-			if ( ! empty( $posts ) ) {
-				foreach ( $posts as $post_id ) {
+			if ( ! empty($posts)) {
+				foreach ($posts as $post_id) {
 					$post_args = array(
-						'articleBody' => wp_strip_all_tags( get_the_excerpt( $post_id ) ),
-						'headline'    => get_the_title( $post_id ),
+						'articleBody' => wp_strip_all_tags(get_the_excerpt($post_id)),
+						'headline'    => get_the_title($post_id),
 					);
-					$section   = get_the_term_list( $post_id, 'category' );
-					if ( ! is_wp_error( $section ) && '' !== $section && false !== $section ) {
-						$post_args['articleSection'] = wp_strip_all_tags( $section );
+					$section = get_the_term_list($post_id, 'category');
+					if ( ! is_wp_error($section) && '' !== $section && false !== $section) {
+						$post_args['articleSection'] = wp_strip_all_tags($section);
 					}
-					if ( $this->context->site_represents_reference ) {
+					if ($this->context->site_represents_reference) {
 						$post_args['publisher'] = $this->context->site_represents_reference;
 					}
-					$image_url = get_the_post_thumbnail_url( $post_id, 'lsx-thumbnail-wide' );
-					if ( false !== $image_url ) {
+					$image_url = get_the_post_thumbnail_url($post_id, 'lsx-thumbnail-wide');
+					if (false !== $image_url) {
 						$post_args['image'] = $image_url;
 					}
-					$posts_array = LSX_Schema_Utils::add_article( $posts_array, $post_id, $this->context, $post_args );
+					$posts_array = LSX_Schema_Utils::add_article($posts_array, $post_id, $this->context, $post_args);
 				}
-				if ( ! empty( $posts_array ) ) {
-					$data[ $data_key ] = $posts_array;
+				if ( ! empty($posts_array)) {
+					$data[$data_key] = $posts_array;
 				}
 			}
 			return $data;
@@ -176,19 +176,19 @@ 
 		 *
 		 * @return array $data
 		 */
-		public function add_connections( $data ) {
+		public function add_connections($data) {
 			$connections_array = array();
-			if ( $this->is_top_level ) {
-				$connections_array = $this->add_regions( $connections_array );
-				$connections_array = $this->add_accommodation( $connections_array );
-				if ( ! empty( $connections_array ) ) {
+			if ($this->is_top_level) {
+				$connections_array = $this->add_regions($connections_array);
+				$connections_array = $this->add_accommodation($connections_array);
+				if ( ! empty($connections_array)) {
 					$data['containsPlace'] = $connections_array;
 				}
 			} else {
-				$connections_array             = $this->add_countries( $connections_array );
+				$connections_array = $this->add_countries($connections_array);
 				$data['containedInPlace'] = $connections_array;
 				$connections_array          = array();
-				$connections_array          = $this->add_accommodation( $connections_array );
+				$connections_array          = $this->add_accommodation($connections_array);
 				$data['containsPlace'] = $connections_array;
 			}
 			return $data;
@@ -202,14 +202,14 @@ 
 		 *
 		 * @return array $data Review data.
 		 */
-		public function add_taxonomy_terms( $data, $data_key, $taxonomy ) {
+		public function add_taxonomy_terms($data, $data_key, $taxonomy) {
 			/**
 			 * Filter: 'lsx_schema_' . $this->post_type . '_' . $data_key . '_taxonomy' - Allow changing the taxonomy used to assign keywords to a post type Review data.
 			 *
 			 * @api string $taxonomy The chosen taxonomy.
 			 */
-			$taxonomy = apply_filters( 'lsx_schema_' . $this->post_type . '_' . $data_key . '_taxonomy', $taxonomy );
-			return LSX_Schema_Utils::add_terms( $data, $this->context->id, $data_key, $taxonomy );
+			$taxonomy = apply_filters('lsx_schema_' . $this->post_type . '_' . $data_key . '_taxonomy', $taxonomy);
+			return LSX_Schema_Utils::add_terms($data, $this->context->id, $data_key, $taxonomy);
 		}
 		/**
 		 * Adds the custom field value for the supplied key
@@ -221,10 +221,10 @@ 
 		 *
 		 * @return array $data Review data.
 		 */
-		public function add_custom_field( $data, $data_key, $meta_key, $single = true ) {
-			$value = get_post_meta( $this->context->id, $meta_key, $single );
-			if ( '' !== $value && false !== $value ) {
-				$data[ $data_key ] = $value;
+		public function add_custom_field($data, $data_key, $meta_key, $single = true) {
+			$value = get_post_meta($this->context->id, $meta_key, $single);
+			if ('' !== $value && false !== $value) {
+				$data[$data_key] = $value;
 			}
 			return $data;
 		}