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Author: jorgefilipecosta

src/wp-includes/abilities.php

@@ -100,8 +100,7 @@ function wp_register_core_abilities(): void {
 					),
 				),
 				'additionalProperties' => false,
-				// Casting to object so when it is serilized to JSON it shows as {} instead of [].
-				'default'              => (object) array(),
+				'default'              => array(),
 			),
 			'output_schema'       => array(
 				'type'                 => 'object',

src/wp-includes/rest-api/endpoints/class-wp-rest-abilities-v1-list-controller.php

@@ -214,6 +214,21 @@ public function prepare_item_for_response( $ability, $request ) {
 			'meta'          => $ability->get_meta(),
 		);
 
+		// Convert top-level defaults to an object when its type is object and
+		// they are an empty array so they get serialized as {} instead of [].
+		if ( isset( $data['input_schema']['type'] ) && 'object' === $data['input_schema']['type'] && isset( $data['input_schema']['default'] ) ) {
+			$default = $data['input_schema']['default'];
+			if ( is_array( $default ) && empty( $default ) ) {
+				$data['input_schema']['default'] = (object) $default;
+			}
+		}
+		if ( isset( $data['output_schema']['type'] ) && 'object' === $data['output_schema']['type'] && isset( $data['output_schema']['default'] ) ) {
+			$default = $data['output_schema']['default'];
+			if ( is_array( $default ) && empty( $default ) ) {
+				$data['output_schema']['default'] = (object) $default;
+			}
+		}
+
 		$context = $request['context'] ?? 'view';
 		$data    = $this->add_additional_fields_to_object( $data, $request );
 		$data    = $this->filter_response_by_context( $data, $context );