From c18987bbe1b66556e82d627178fdba3836787bab Mon Sep 17 00:00:00 2001
From: Paul Holden <paulh@moodle.com>
Date: Wed, 19 May 2021 09:59:05 +0100
Subject: [PATCH] MDL-71685 dataformat_json: include column names in exported
 file.

---
 dataformat/json/classes/writer.php | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/dataformat/json/classes/writer.php b/dataformat/json/classes/writer.php
index effd83ecaa9..c7803ad7d74 100644
--- a/dataformat/json/classes/writer.php
+++ b/dataformat/json/classes/writer.php
@@ -24,7 +24,7 @@
 
 namespace dataformat_json;
 
-defined('MOODLE_INTERNAL') || die();
+use core_text;
 
 /**
  * JSON data format writer
@@ -47,6 +47,9 @@ class writer extends \core\dataformat\base {
     /** @var $sheetdatadded */
     public $sheetdatadded = false;
 
+    /** @var string[] $columns */
+    protected $columns = [];
+
     /**
      * Write the start of the file.
      */
@@ -60,6 +63,10 @@ class writer extends \core\dataformat\base {
      * @param array $columns
      */
     public function start_sheet($columns) {
+        $this->columns = array_map(function($column) {
+            return core_text::strtolower(clean_param($column, PARAM_ALPHA));
+        }, $columns);
+
         if ($this->sheetstarted) {
             echo ",";
         } else {
@@ -80,6 +87,8 @@ class writer extends \core\dataformat\base {
             echo ",";
         }
 
+        // Ensure our record is keyed by column names, rather than numerically.
+        $record = array_combine($this->columns, (array) $record);
         echo json_encode($this->format_record($record), JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);
 
         $this->sheetdatadded = true;