From e831b42774982d661167ccd8f9b1d68cddc34d0c Mon Sep 17 00:00:00 2001
From: stefanprobst <stefan.probst@univie.ac.at>
Date: Tue, 8 Jan 2019 18:08:12 +0100
Subject: [PATCH] fix(gatsby-transformer-remark): remove unused _PARENT field
 from frontmatter (#10919)

---
 .../src/__tests__/__snapshots__/gatsby-node.js.snap  | 12 ++++--------
 .../gatsby-transformer-remark/src/on-node-create.js  |  1 -
 2 files changed, 4 insertions(+), 9 deletions(-)

diff --git a/packages/gatsby-transformer-remark/src/__tests__/__snapshots__/gatsby-node.js.snap b/packages/gatsby-transformer-remark/src/__tests__/__snapshots__/gatsby-node.js.snap
index 663f38f8d4a04..a7fe672e7411b 100644
--- a/packages/gatsby-transformer-remark/src/__tests__/__snapshots__/gatsby-node.js.snap
+++ b/packages/gatsby-transformer-remark/src/__tests__/__snapshots__/gatsby-node.js.snap
@@ -7,7 +7,6 @@ Array [
       "children": Array [],
       "excerpt": "",
       "frontmatter": Object {
-        "_PARENT": "whatever",
         "date": "2017-09-18T23:19:51.246Z",
         "title": "my little pony",
       },
@@ -15,7 +14,7 @@ Array [
       "internal": Object {
         "content": "Where oh where is my little pony?
             ",
-        "contentDigest": "e33e9489dc1352bfac2577e99155c1b3",
+        "contentDigest": "26a9a60af333645b5ca69261c7d9aa53",
         "type": "MarkdownRemark",
       },
       "parent": "whatever",
@@ -34,7 +33,6 @@ Array [
         "children": Array [],
         "excerpt": "",
         "frontmatter": Object {
-          "_PARENT": "whatever",
           "date": "2017-09-18T23:19:51.246Z",
           "title": "my little pony",
         },
@@ -42,7 +40,7 @@ Array [
         "internal": Object {
           "content": "Where oh where is my little pony?
             ",
-          "contentDigest": "e33e9489dc1352bfac2577e99155c1b3",
+          "contentDigest": "26a9a60af333645b5ca69261c7d9aa53",
           "type": "MarkdownRemark",
         },
         "parent": "whatever",
@@ -79,7 +77,6 @@ In quis lectus sed eros efficitur luctus. Morbi tempor, nisl eget feugiat tincid
 
 ",
       "frontmatter": Object {
-        "_PARENT": "whatever",
         "date": "2017-09-18T23:19:51.246Z",
         "title": "my little pony",
       },
@@ -97,7 +94,7 @@ Sed eu gravida mauris. Suspendisse potenti. Praesent sit amet egestas mi, sed he
 
 Sed bibendum sem iaculis, pellentesque leo sed, imperdiet ante. Sed consequat mattis dui nec pretium. Donec vel consectetur est. Nam sagittis, libero vitae pretium pharetra, velit est dignissim erat, at cursus quam massa vitae ligula. Suspendisse potenti. In hac habitasse platea dictumst. Donec sit amet finibus justo. Mauris ante dolor, pulvinar vitae feugiat eu, rhoncus nec diam. In ut accumsan diam, faucibus fringilla odio. Nunc id ultricies turpis. Quisque justo quam, tristique sit amet interdum quis, facilisis at mi. Fusce porttitor vel sem ut condimentum. Praesent at libero congue, vulputate elit ut, rhoncus erat.
             ",
-        "contentDigest": "e9f6c76d1bc3cb15f402ed2c24b815bd",
+        "contentDigest": "024ff0e6141e2121fe04090114c7535a",
         "type": "MarkdownRemark",
       },
       "parent": "whatever",
@@ -130,7 +127,6 @@ In quis lectus sed eros efficitur luctus. Morbi tempor, nisl eget feugiat tincid
 
 ",
         "frontmatter": Object {
-          "_PARENT": "whatever",
           "date": "2017-09-18T23:19:51.246Z",
           "title": "my little pony",
         },
@@ -148,7 +144,7 @@ Sed eu gravida mauris. Suspendisse potenti. Praesent sit amet egestas mi, sed he
 
 Sed bibendum sem iaculis, pellentesque leo sed, imperdiet ante. Sed consequat mattis dui nec pretium. Donec vel consectetur est. Nam sagittis, libero vitae pretium pharetra, velit est dignissim erat, at cursus quam massa vitae ligula. Suspendisse potenti. In hac habitasse platea dictumst. Donec sit amet finibus justo. Mauris ante dolor, pulvinar vitae feugiat eu, rhoncus nec diam. In ut accumsan diam, faucibus fringilla odio. Nunc id ultricies turpis. Quisque justo quam, tristique sit amet interdum quis, facilisis at mi. Fusce porttitor vel sem ut condimentum. Praesent at libero congue, vulputate elit ut, rhoncus erat.
             ",
-          "contentDigest": "e9f6c76d1bc3cb15f402ed2c24b815bd",
+          "contentDigest": "024ff0e6141e2121fe04090114c7535a",
           "type": "MarkdownRemark",
         },
         "parent": "whatever",
diff --git a/packages/gatsby-transformer-remark/src/on-node-create.js b/packages/gatsby-transformer-remark/src/on-node-create.js
index 76b2931ca82ad..102557ca1f8e8 100644
--- a/packages/gatsby-transformer-remark/src/on-node-create.js
+++ b/packages/gatsby-transformer-remark/src/on-node-create.js
@@ -45,7 +45,6 @@ module.exports = async function onCreateNode(
     markdownNode.frontmatter = {
       title: ``, // always include a title
       ...data.data,
-      _PARENT: node.id,
     }
 
     markdownNode.excerpt = data.excerpt