WIP on document conversion

src/lib/ItemAndFeed.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace FeedReaderCentral;
+
+use BitBadger\Documents\JsonMapper;
+use BitBadger\Documents\Mapper;
+use FeedReaderCentral\Domain\Feed;
+use FeedReaderCentral\Domain\Item;
+use FeedReaderCentral\Domain\Table;
+
+/**
+ * A combined item and feed (used for lists)
+ */
+class ItemAndFeed
+{
+    /** @var Item The item to be manipulated */
+    public Item $item;
+
+    /** @var Feed The feed to which the item belongs */
+    public Feed $feed;
+
+    /**
+     * Create a mapper for this item
+     * @return Mapper<ItemAndFeed> A mapper to deserialize this from the query
+     */
+    public static function mapper(): Mapper
+    {
+        return new class implements Mapper {
+            public function map(array $result): ItemAndFeed
+            {
+                $it = new ItemAndFeed();
+                $it->item = (new JsonMapper(Item::class, 'item_data'))->map($result);
+                $it->feed = (new JsonMapper(Feed::class, 'feed_data'))->map($result);
+                return $it;
+            }
+        };
+    }
+
+    /**
+     * Generate the `SELECT` and `FROM` clauses for the query to retrieve this item
+     *
+     * @return string The `SELECT` and `FROM` clauses to retrieve these items
+     */
+    public static function selectFrom(): string
+    {
+        $item = Table::ITEM;
+        $feed = Table::FEED;
+        return <<<SQL
+            SELECT $item.data AS item_data, $feed.data AS feed_data
+              FROM $item INNER JOIN $feed ON $item.data->>'feed_id' = $feed.data->>'id'
+            SQL;
+    }
+}