neuf-events: add custom meta fields to graphql schema

plugins/neuf-events/neuf-events-graphql.php

@@ -0,0 +1,63 @@
+<?php
+/* GraphQL */
+
+function neuf_events_graphql_register_types()
+{
+    $meta_fields = [
+        'event' => [
+            '_neuf_events_fb_url' => [
+                'name' => 'facebookUrl',
+                'type' => 'String',
+            ],
+            '_neuf_events_bs_url' => [
+                'name' => 'ticketUrl',
+                'type' => 'String',
+            ],
+            '_neuf_events_price_regular' => [
+                'name' => 'priceRegular',
+                'type' => 'String',
+            ],
+            '_neuf_events_price_member' => [
+                'name' => 'priceStudent',
+                'type' => 'String',
+            ],
+            '_neuf_events_starttime' => [
+                'name' => 'startTime',
+                'type' => 'String',
+                'transform' => 'epoch_to_str',
+            ],
+            '_neuf_events_endtime' => [
+                'name' => 'endTime',
+                'type' => 'String',
+                'transform' => 'epoch_to_str',
+            ],
+        ]
+    ];
+
+    foreach ($meta_fields as $object_name => $fields) {
+
+        foreach ($fields as $field_name => $field_options) {
+            $field_api_name = $field_options['name'];
+            $field_type = $field_options['type'];
+            $transform = array_key_exists('transform', $field_options) ? $field_options['transform'] : null;
+            $field_name_key = $field_name;
+            register_graphql_field($object_name, $field_api_name, [
+                'type' => $field_type,
+                'resolve' => function ($post) use ($field_name_key, $transform) {
+                    $value = get_post_meta($post->ID, $field_name_key, true);
+                    if (!$transform) {
+                        return $value;
+                    }
+                    if ($transform === 'epoch_to_str') {
+                        if (!is_numeric($value)) {
+                            return null;
+                        }
+                        return date('Y-m-d\TH:i:s', $value);
+                    }
+                    return $value;
+                }
+            ]);
+        }
+    }
+}
+add_action('graphql_register_types', 'neuf_events_graphql_register_types');

plugins/neuf-events/neuf-events.php

@@ -15,6 +15,7 @@ License: GPL v2 or later
 require_once 'neuf-events-post-types.php';
 require_once 'neuf-events-admin.php';
 require_once 'neuf-events-taxonomies.php';
+require_once 'neuf-events-graphql.php';
 
 if (defined('WP_CLI') && WP_CLI) {
     require_once 'neuf-events-cli.php';