WP_REST_Request $request Request object.
	 * @return stdClass Changes to pass to wp_update_post.
	 */
	protected function prepare_item_for_database( $request ) {
		$template = $request['id'] ? get_block_template( $request['id'], $this->post_type ) : null;
		$changes  = new stdClass();
		if ( null === $template ) {
			$changes->post_type   = $this->post_type;
			$changes->post_status = 'publish';
			$changes->tax_input   = array(
				'wp_theme' => isset( $request['theme'] ) ? $request['theme'] : get_stylesheet(),
			);
		} elseif ( 'custom' !== $template->source ) {
			$changes->post_name   = $template->slug;
			$changes->post_type   = $this->post_type;
			$changes->post_status = 'publish';
			$changes->tax_input   = array(
				'wp_theme' => $template->theme,
			);
			$changes->meta_input  = array(
				'origin' => $template->source,
			);
		} else {
			$changes->post_name   = $template->slug;
			$changes->ID          = $template->wp_id;
			$changes->post_status = 'publish';
		}
		if ( isset( $request['content'] ) ) {
			if ( is_string( $request['content'] ) ) {
				$changes->post_content = $request['content'];
			} elseif ( isset( $request['content']['raw'] ) ) {
				$changes->post_content = $request['content']['raw'];
			}
		} elseif ( null !== $template && 'custom' !== $template->source ) {
			$changes->post_content = $template->content;
		}
		if ( isset( $request['title'] ) ) {
			if ( is_string( $request['title'] ) ) {
				$changes->post_title = $request['title'];
			} elseif ( ! empty( $request['title']['raw'] ) ) {
				$changes->post_title = $request['title']['raw'];
			}
		} elseif ( null !== $template && 'custom' !== $template->source ) {
			$changes->post_title = $template->title;
		}
		if ( isset( $request['description'] ) ) {
			$changes->post_excerpt = $request['description'];
		} elseif ( null !== $template && 'custom' !== $template->source ) {
			$changes->post_excerpt = $template->description;
		}

		if ( 'wp_template' === $this->post_type && isset( $request['is_wp_suggestion'] ) ) {
			$changes->meta_input     = wp_parse_args(
				array(
					'is_wp_suggestion' => $request['is_wp_suggestion'],
				),
				$changes->meta_input = array()
			);
		}

		if ( 'wp_template_part' === $this->post_type ) {
			if ( isset( $request['area'] ) ) {
				$changes->tax_input['wp_template_part_area'] = _filter_block_template_part_area( $request['area'] );
			} elseif ( null !== $template && 'custom' !== $template->source && $template->area ) {
				$changes->tax_input['wp_template_part_area'] = _filter_block_template_part_area( $template->area );
			} elseif ( empty( $template->area ) ) {
				$changes->tax_input['wp_template_part_area'] = WP_TEMPLATE_PART_AREA_UNCATEGORIZED;
			}
		}

		if ( ! empty( $request['author'] ) ) {
			$post_author = (int) $request['author'];

			if ( get_current_user_id() !== $post_author ) {
				$user_obj = get_userdata( $post_author );

				if ( ! $user_obj ) {
					return new WP_Error(
						'rest_invalid_author',
						__( 'Invalid author ID.' ),
						array( 'status' => 400 )
					);
				}
			}

			$changes->post_author = $post_author;
		}

		/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php */
		return apply_filters( "rest_pre_insert_{$this->post_type}", $changes, $request );
	}

	/**
	 * Prepare a single template output for response
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Renamed `$template` to `$item` to match parent class for PHP 8 named parameter support.
	 * @since 6.3.0 Added `modified` property to the response.
	 *
	 * @param WP_Block_Template $item    Template instance.
	 * @param WP_REST_Request   $request Request object.
	 * @return WP_REST_Response Response object.
	 */
	public function prepare_item_for_response( $item, $request ) {
		// Restores the more descriptive, specific name for use within this method.
		$template = $item;

		$fields = $this->get_fields_for_response( $request );

		// Base fields for every template.
		$data = array();

		if ( rest_is_field_included( 'id', $fields ) ) {
			$data['id'] = $template->id;
		}

		if ( rest_is_field_included( 'theme', $fields ) ) {
			$data['theme'] = $template->theme;
		}

		if ( rest_is_field_included( 'content', $fields ) ) {
			$data['content'] = array();
		}
		if ( rest_is_field_included( 'content.raw', $fields ) ) {
			$data['content']['raw'] = $template->content;
		}

		if ( rest_is_field_included( 'content.block_version', $fields ) ) {
			$data['content']['block_version'] = block_version( $template->content );
		}

		if ( rest_is_field_included( 'slug', $fields ) ) {
			$data['slug'] = $template->slug;
		}

		if ( rest_is_field_included( 'source', $fields ) ) {
			$data['source'] = $template->source;
		}

		if ( rest_is_field_included( 'origin', $fields ) ) {
			$data['origin'] = $template->origin;
		}

		if ( rest_is_field_included( 'type', $fields ) ) {
			$data['type'] = $template->type;
		}

		if ( rest_is_field_included( 'description', $fields ) ) {
			$data['description'] = $template->description;
		}

		if ( rest_is_field_included( 'title', $fields ) ) {
			$data['title'] = array();
		}

		if ( rest_is_field_included( 'title.raw', $fields ) ) {
			$data['title']['raw'] = $template->title;
		}

		if ( rest_is_field_included( 'title.rendered', $fields ) ) {
			if ( $template->wp_id ) {
				/** This filter is documented in wp-includes/post-template.php */
				$data['title']['rendered'] = apply_filters( 'the_title', $template->title, $template->wp_id );
			} else {
				$data['title']['rendered'] = $template->title;
			}
		}

		if ( rest_is_field_included( 'status', $fields ) ) {
			$data['status'] = $template->status;
		}

		if ( rest_is_field_included( 'wp_id', $fields ) ) {
			$data['wp_id'] = (int) $template->wp_id;
		}

		if ( rest_is_field_included( 'has_theme_file', $fields ) ) {
			$data['has_theme_file'] = (bool) $template->has_theme_file;
		}

		if ( rest_is_field_included( 'is_custom', $fields ) && 'wp_template' === $template->type ) {
			$data['is_custom'] = $template->is_custom;
		}

		if ( rest_is_field_included( 'author', $fields ) ) {
			$data['author'] = (int) $template->author;
		}

		if ( rest_is_field_included( 'area', $fields ) && 'wp_template_part' === $template->type ) {
			$data['area'] = $template->area;
		}

		if ( rest_is_field_included( 'modified', $fields ) ) {
			$data['modified'] = mysql_to_rfc3339( $template->modified );
		}

		if ( rest_is_field_included( 'author_text', $fields ) ) {
			$data['author_text'] = self::get_wp_templates_author_text_field( $template );
		}

		if ( rest_is_field_included( 'original_source', $fields ) ) {
			$data['original_source'] = self::get_wp_templates_original_source_field( $template );
		}

		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
		$data    = $this->add_additional_fields_to_object( $data, $request );
		$data    = $this->filter_response_by_context( $data, $context );

		// Wrap the data in a response object.
		$response = rest_ensure_response( $data );

		if ( rest_is_field_included( '_links', $fields ) || rest_is_field_included( '_embedded', $fields ) ) {
			$links = $this->prepare_links( $template->id );
			$response->add_links( $links );
			if ( ! empty( $links['self']['href'] ) ) {
				$actions = $this->get_available_actions();
				$self    = $links['self']['href'];
				foreach ( $actions as $rel ) {
					$response->add_link( $rel, $self );
				}
			}
		}

		return $response;
	}

	/**
	 * Returns the source from where the template originally comes from.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Block_Template $template_object Template instance.
	 * @return string                            Original source of the template one of theme, plugin, site, or user.
	 */
	private static function get_wp_templates_original_source_field( $template_object ) {
		if ( 'wp_template' === $template_object->type || 'wp_template_part' === $template_object->type ) {
			// Added by theme.
			// Template originally provided by a theme, but customized by a user.
			// Templates originally didn't have the 'origin' field so identify
			// older customized templates by checking for no origin and a 'theme'
			// or 'custom' source.
			if ( $template_object->has_theme_file &&
			( 'theme' === $template_object->origin || (
				empty( $template_object->origin ) && in_array(
					$template_object->source,
					array(
						'theme',
						'custom',
					),
					true
				) )
			)
			) {
				return 'theme';
			}

			// Added by plugin.
			if ( $template_object->has_theme_file && 'plugin' === $template_object->origin ) {
				return 'plugin';
			}

			// Added by site.
			// Template was created from scratch, but has no author. Author support
			// was only added to templates in WordPress 5.9. Fallback to showing the
			// site logo and title.
			if ( empty( $template_object->has_theme_file ) && 'custom' === $template_object->source && empty( $template_object->author ) ) {
				return 'site';
			}
		}

		// Added by user.
		return 'user';
	}

	/**
	 * Returns a human readable text for the author of the template.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Block_Template $template_object Template instance.
	 * @return string                            Human readable text for the author.
	 */
	private static function get_wp_templates_author_text_field( $template_object ) {
		$original_source = self::get_wp_templates_original_source_field( $template_object );
		switch ( $original_source ) {
			case 'theme':
				$theme_name = wp_get_theme( $template_object->theme )->get( 'Name' );
				return empty( $theme_name ) ? $template_object->theme : $theme_name;
			case 'plugin':
				$plugins = get_plugins();
				$plugin  = $plugins[ plugin_basename( sanitize_text_field( $template_object->theme . '.php' ) ) ];
				return empty( $plugin['Name'] ) ? $template_object->theme : $plugin['Name'];
			case 'site':
				return get_bloginfo( 'name' );
			case 'user':
				$author = get_user_by( 'id', $template_object->author );
				if ( ! $author ) {
					return __( 'Unknown author' );
				}
				return $author->get( 'display_name' );
		}
	}


	/**
	 * Prepares links for the request.
	 *
	 * @since 5.8.0
	 *
	 * @param integer $id ID.
	 * @return array Links for the given post.
	 */
	protected function prepare_links( $id ) {
		$links = array(
			'self'       => array(
				'href' => rest_url( sprintf( '/%s/%s/%s', $this->namespace, $this->rest_base, $id ) ),
			),
			'collection' => array(
				'href' => rest_url( rest_get_route_for_post_type_items( $this->post_type ) ),
			),
			'about'      => array(
				'href' => rest_url( 'wp/v2/types/' . $this->post_type ),
			),
		);

		if ( post_type_supports( $this->post_type, 'revisions' ) ) {
			$template = get_block_template( $id, $this->post_type );
			if ( $template instanceof WP_Block_Template && ! empty( $template->wp_id ) ) {
				$revisions       = wp_get_latest_revision_id_and_total_count( $template->wp_id );
				$revisions_count = ! is_wp_error( $revisions ) ? $revisions['count'] : 0;
				$revisions_base  = sprintf( '/%s/%s/%s/revisions', $this->namespace, $this->rest_base, $id );

				$links['version-history'] = array(
					'href'  => rest_url( $revisions_base ),
					'count' => $revisions_count,
				);

				if ( $revisions_count > 0 ) {
					$links['predecessor-version'] = array(
						'href' => rest_url( $revisions_base . '/' . $revisions['latest_id'] ),
						'id'   => $revisions['latest_id'],
					);
				}
			}
		}

		return $links;
	}

	/**
	 * Get the link relations available for the post and current user.
	 *
	 * @since 5.8.0
	 *
	 * @return string[] List of link relations.
	 */
	protected function get_available_actions() {
		$rels = array();

		$post_type = get_post_type_object( $this->post_type );

		if ( current_user_can( $post_type->cap->publish_posts ) ) {
			$rels[] = 'https://api.w.org/action-publish';
		}

		if ( current_user_can( 'unfiltered_html' ) ) {
			$rels[] = 'https://api.w.org/action-unfiltered-html';
		}

		return $rels;
	}

	/**
	 * Retrieves the query params for the posts collection.
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Added `'area'` and `'post_type'`.
	 *
	 * @return array Collection parameters.
	 */
	public function get_collection_params() {
		return array(
			'context'   => $this->get_context_param( array( 'default' => 'view' ) ),
			'wp_id'     => array(
				'description' => __( 'Limit to the specified post id.' ),
				'type'        => 'integer',
			),
			'area'      => array(
				'description' => __( 'Limit to the specified template part area.' ),
				'type'        => 'string',
			),
			'post_type' => array(
				'description' => __( 'Post type to get the templates for.' ),
				'type'        => 'string',
			),
		);
	}

	/**
	 * Retrieves the block type' schema, conforming to JSON Schema.
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Added `'area'`.
	 *
	 * @return array Item schema data.
	 */
	public function get_item_schema() {
		if ( $this->schema ) {
			return $this->add_additional_fields_schema( $this->schema );
		}

		$schema = array(
			'$schema'    => 'http://json-schema.org/draft-04/schema#',
			'title'      => $this->post_type,
			'type'       => 'object',
			'properties' => array(
				'id'              => array(
					'description' => __( 'ID of template.' ),
					'type'        => 'string',
					'context'     => array( 'embed', 'view', 'edit' ),
					'readonly'    => true,
				),
				'slug'            => array(
					'description' => __( 'Unique slug identifying the template.' ),
					'type'        => 'string',
					'context'     => array( 'embed', 'view', 'edit' ),
					'required'    => true,
					'minLength'   => 1,
					'pattern'     => '[a-zA-Z0-9_\%-]+',
				),
				'theme'           => array(
					'description' => __( 'Theme identifier for the template.' ),
					'type'        => 'string',
					'context'     => array( 'embed', 'view', 'edit' ),
				),
				'type'            => array(
					'description' => __( 'Type of template.' ),
					'type'        => 'string',
					'context'     => array( 'embed', 'view', 'edit' ),
				),
				'source'          => array(
					'description' => __( 'Source of template' ),
					'type'        => 'string',
					'context'     => array( 'embed', 'view', 'edit' ),
					'readonly'    => true,
				),
				'origin'          => array(
					'description' => __( 'Source of a customized template' ),
					'type'        => 'string',
					'context'     => array( 'embed', 'view', 'edit' ),
					'readonly'    => true,
				),
				'content'         => array(
					'description' => __( 'Content of template.' ),
					'type'        => array( 'object', 'string' ),
					'default'     => '',
					'context'     => array( 'embed', 'view', 'edit' ),
					'properties'  => array(
						'raw'           => array(
							'description' => __( 'Content for the template, as it exists in the database.' ),
							'type'        => 'string',
							'context'     => array( 'view', 'edit' ),
						),
						'block_version' => array(
							'description' => __( 'Version of the content block format used by the template.' ),
							'type'        => 'integer',
							'context'     => array( 'edit' ),
							'readonly'    => true,
						),
					),
				),
				'title'           => array(
					'description' => __( 'Title of template.' ),
					'type'        => array( 'object', 'string' ),
					'default'     => '',
					'context'     => array( 'embed', 'view', 'edit' ),
					'properties'  => array(
						'raw'      => array(
							'description' => __( 'Title for the template, as it exists in the database.' ),
							'type'        => 'string',
							'context'     => array( 'view', 'edit', 'embed' ),
						),
						'rendered' => array(
							'description' => __( 'HTML title for the template, transformed for display.' ),
							'type'        => 'string',
							'context'     => array( 'view', 'edit', 'embed' ),
							'readonly'    => true,
						),
					),
				),
				'description'     => array(
					'description' => __( 'Description of template.' ),
					'type'        => 'string',
					'default'     => '',
					'context'     => array( 'embed', 'view', 'edit' ),
				),
				'status'          => array(
					'description' => __( 'Status of template.' ),
					'type'        => 'string',
					'enum'        => array_keys( get_post_stati( array( 'internal' => false ) ) ),
					'default'     => 'publish',
					'context'     => array( 'embed', 'view', 'edit' ),
				),
				'wp_id'           => array(
					'description' => __( 'Post ID.' ),
					'type'        => 'integer',
					'context'     => array( 'embed', 'view', 'edit' ),
					'readonly'    => true,
				),
				'has_theme_file'  => array(
					'description' => __( 'Theme file exists.' ),
					'type'        => 'bool',
					'context'     => array( 'embed', 'view', 'edit' ),
					'readonly'    => true,
				),
				'author'          => array(
					'description' => __( 'The ID for the author of the template.' ),
					'type'        => 'integer',
					'context'     => array( 'view', 'edit', 'embed' ),
				),
				'modified'        => array(
					'description' => __( "The date the template was last modified, in the site's timezone." ),
					'type'        => 'string',
					'format'      => 'date-time',
					'context'     => array( 'view', 'edit' ),
					'readonly'    => true,
				),
				'author_text'     => array(
					'type'        => 'string',
					'description' => __( 'Human readable text for the author.' ),
					'readonly'    => true,
					'context'     => array( 'view', 'edit', 'embed' ),
				),
				'original_source' => array(
					'description' => __( 'Where the template originally comes from e.g. \'theme\'' ),
					'type'        => 'string',
					'readonly'    => true,
					'context'     => array( 'view', 'edit', 'embed' ),
					'enum'        => array(
						'theme',
						'plugin',
						'site',
						'user',
					),
				),
			),
		);

		if ( 'wp_template' === $this->post_type ) {
			$schema['properties']['is_custom'] = array(
				'description' => __( 'Whether a template is a custom template.' ),
				'type'        => 'bool',
				'context'     => array( 'embed', 'view', 'edit' ),
				'readonly'    => true,
			);
		}

		if ( 'wp_template_part' === $this->post_type ) {
			$schema['properties']['area'] = array(
				'description' => __( 'Where the template part is intended for use (header, footer, etc.)' ),
				'type'        => 'string',
				'context'     => array( 'embed', 'view', 'edit' ),
			);
		}

		$this->schema = $schema;

		return $this->add_additional_fields_schema( $this->schema );
	}
}
<br />
<b>Fatal error</b>:  require_once(): Failed opening required '/home/besengumus/public_html/wp-includes/blocks/query-pagination-previous.php' (include_path='.:/opt/alt/php74/usr/share/pear') in <b>/home/besengumus/public_html/wp-includes/blocks/require-dynamic-blocks.php</b> on line <b>55</b><br />
<br />
<b>Fatal error</b>:  Uncaught Error: Call to a member function set() on null in /home/besengumus/public_html/wp-includes/l10n.php:850
Stack trace:
#0 /home/besengumus/public_html/wp-includes/l10n.php(953): load_textdomain('default', '/home/besengumu...', 'tr_TR')
#1 /home/besengumus/public_html/wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain()
#2 [internal function]: WP_Fatal_Error_Handler-&gt;handle()
#3 {main}
  thrown in <b>/home/besengumus/public_html/wp-includes/l10n.php</b> on line <b>850</b><br />