Source

File: wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php

public function prepare_item_for_response( $comment, $request ) {

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

		if ( in_array( 'id', $fields, true ) ) {
			$data['id'] = (int) $comment->comment_ID;
		}

		if ( in_array( 'post', $fields, true ) ) {
			$data['post'] = (int) $comment->comment_post_ID;
		}

		if ( in_array( 'parent', $fields, true ) ) {
			$data['parent'] = (int) $comment->comment_parent;
		}

		if ( in_array( 'author', $fields, true ) ) {
			$data['author'] = (int) $comment->user_id;
		}

		if ( in_array( 'author_name', $fields, true ) ) {
			$data['author_name'] = $comment->comment_author;
		}

		if ( in_array( 'author_email', $fields, true ) ) {
			$data['author_email'] = $comment->comment_author_email;
		}

		if ( in_array( 'author_url', $fields, true ) ) {
			$data['author_url'] = $comment->comment_author_url;
		}

		if ( in_array( 'author_ip', $fields, true ) ) {
			$data['author_ip'] = $comment->comment_author_IP;
		}

		if ( in_array( 'author_user_agent', $fields, true ) ) {
			$data['author_user_agent'] = $comment->comment_agent;
		}

		if ( in_array( 'date', $fields, true ) ) {
			$data['date'] = mysql_to_rfc3339( $comment->comment_date );
		}

		if ( in_array( 'date_gmt', $fields, true ) ) {
			$data['date_gmt'] = mysql_to_rfc3339( $comment->comment_date_gmt );
		}

		if ( in_array( 'content', $fields, true ) ) {
			$data['content'] = array(
				/** This filter is documented in wp-includes/comment-template.php */
				'rendered' => apply_filters( 'comment_text', $comment->comment_content, $comment ),
				'raw'      => $comment->comment_content,
			);
		}

		if ( in_array( 'link', $fields, true ) ) {
			$data['link'] = get_comment_link( $comment );
		}

		if ( in_array( 'status', $fields, true ) ) {
			$data['status'] = $this->prepare_status_response( $comment->comment_approved );
		}

		if ( in_array( 'type', $fields, true ) ) {
			$data['type'] = get_comment_type( $comment->comment_ID );
		}

		if ( in_array( 'author_avatar_urls', $fields, true ) ) {
			$data['author_avatar_urls'] = rest_get_avatar_urls( $comment );
		}

		if ( in_array( 'meta', $fields, true ) ) {
			$data['meta'] = $this->meta->get_value( $comment->comment_ID, $request );
		}

		$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 );

		$response->add_links( $this->prepare_links( $comment ) );

		/**
		 * Filters a comment returned from the API.
		 *
		 * Allows modification of the comment right before it is returned.
		 *
		 * @since 4.7.0
		 *
		 * @param WP_REST_Response  $response The response object.
		 * @param WP_Comment        $comment  The original comment object.
		 * @param WP_REST_Request   $request  Request used to generate the response.
		 */
		return apply_filters( 'rest_prepare_comment', $response, $comment, $request );
	}