feat: add support for resolving PostContent blocks

.changeset/itchy-mugs-sniff.md

@@ -0,0 +1,5 @@
+---
+"@wpengine/wp-graphql-content-blocks": minor
+---
+
+feat: add support for resolving PostContent blocks

includes/Data/ContentBlocksResolver.php

@@ -149,8 +149,8 @@ private static function handle_do_block( array $block ): ?array {
 
 		// @todo apply more hydrations.
 		$block = self::populate_template_part_inner_blocks( $block );
+		$block = self::populate_post_content_inner_blocks( $block );
 		$block = self::populate_reusable_blocks( $block );
-
 		$block = self::populate_pattern_inner_blocks( $block );
 
 		// Prepare innerBlocks.
@@ -213,6 +213,35 @@ private static function populate_template_part_inner_blocks( array $block ): arr
 		return $block;
 	}
 
+	/**
+	 * Populates the innerBlocks of a core/post-content block with the blocks from the post content.
+	 *
+	 * @param array<string,mixed> $block The block to populate.
+	 *
+	 * @return array<string,mixed> The populated block.
+	 */
+	private static function populate_post_content_inner_blocks( array $block ): array {
+		if ( 'core/post-content' !== $block['blockName'] ) {
+			return $block;
+		}
+
+		$post = get_post();
+
+		if ( ! $post ) {
+			return $block;
+		}
+
+		$parsed_blocks = ! empty( $post->post_content ) ? self::parse_blocks( $post->post_content ) : null;
+
+		if ( empty( $parsed_blocks ) ) {
+			return $block;
+		}
+
+		$block['innerBlocks'] = $parsed_blocks;
+
+		return $block;
+	}
+
 	/**
 	 * Populates reusable blocks with the blocks from the reusable ref ID.
 	 *

tests/unit/ContentBlocksResolverTest.php

@@ -4,6 +4,7 @@
 
 use WPGraphQL\ContentBlocks\Data\ContentBlocksResolver;
 use WPGraphQL\Model\Post;
+use WPGraphQL\Model\Term;
 
 final class ContentBlocksResolverTest extends PluginTestCase {
 	public $instance;
@@ -350,6 +351,82 @@ protected function assertEqualBlocks( $expected, $actual, $message = '' ) {
 		}
 	}
 
+	/**
+	 * Tests that post content inner blocks are resolved correctly.
+	 */
+	public function test_resolve_content_blocks_resolves_post_content_inner_blocks() {
+		// The post content holds what will be the inner blocks.
+		$post_content = '
+			<!-- wp:columns -->
+			<div class="wp-block-columns">
+				<!-- wp:column -->
+				<div class="wp-block-column">
+					<!-- wp:paragraph -->
+					<p>Column 1 Paragraph</p>
+					<!-- /wp:paragraph -->
+				</div>
+				<!-- /wp:column -->
+				<!-- wp:column -->
+				<div class="wp-block-column">
+					<!-- wp:heading -->
+					<h2>Column 2 Heading</h2>
+					<!-- /wp:heading -->
+				</div>
+				<!-- /wp:column -->
+			</div>
+			<!-- /wp:columns -->
+		';
+		wp_update_post(
+			[
+				'ID'           => $this->post_id,
+				'post_content' => $post_content,
+			]
+		);
+
+		// The term holds the PostContent block.
+		$term_id = $this->factory()->term->create(
+			[
+				'taxonomy' => 'category',
+				'name'     => 'Post Content Term',
+				'description' => '<!-- wp:post-content /-->',
+			]
+		);
+		$model_with_blocks = new Term( get_term( $term_id ) );
+
+		add_filter( 'wpgraphql_content_blocks_resolver_content' , function( $content, $node ) {
+			if ( $node instanceof Term ) {
+				// The PostContent Block resolves based on the global.
+				global $post;
+				$post = get_post( $this->post_id );
+
+				return $node->description;
+			}
+
+			return $content;
+		}, 10, 2 );
+
+		// Resolve blocks as nested.
+		$resolved_blocks = $this->instance->resolve_content_blocks( $model_with_blocks, [ 'flat' => false ] );
+
+		// Assertions for nested blocks.
+		$this->assertCount( 1, $resolved_blocks, 'There should be only one top-level block (post-content).' );
+		$this->assertEquals( 'core/post-content', $resolved_blocks[0]['blockName'] );
+		// $this->assertCount( 1, $resolved_blocks[0]['innerBlocks'], 'There should be one top-level block in post content.' );
+		$this->assertEquals( 'core/columns', $resolved_blocks[0]['innerBlocks'][0]['blockName'] );
+
+		// Resolve blocks as flat
+		$resolved_flat_blocks = $this->instance->resolve_content_blocks( $model_with_blocks, [ 'flat' => true ] );
+
+		// Assertions for flat blocks
+		$this->assertCount( 6, $resolved_flat_blocks, 'There should be five blocks when flattened.' );
+		$this->assertEquals( 'core/post-content', $resolved_flat_blocks[0]['blockName'] );
+		$this->assertEquals( 'core/columns', $resolved_flat_blocks[1]['blockName'] );
+		$this->assertEquals( 'core/column', $resolved_flat_blocks[2]['blockName'] );
+		$this->assertEquals( 'core/paragraph', $resolved_flat_blocks[3]['blockName'] );
+		$this->assertEquals( 'core/column', $resolved_flat_blocks[4]['blockName'] );
+		$this->assertEquals( 'core/heading', $resolved_flat_blocks[5]['blockName'] );
+	}
+
 	/**
 	 * Tests that pattern inner blocks are resolved correctly.
 	 */