From 33a9d5774cbf855c6c783e018443e49b430ea0df Mon Sep 17 00:00:00 2001
From: Regev Brody <regevbr@gmail.com>
Date: Thu, 25 Jun 2020 01:51:21 +0300
Subject: [PATCH] fix: GraphQL error with MySQL and FULL OUTER JOIN (#2104)

* fix: GraphQL error with MySQL and FULL OUTER JOIN #2071
---
 server/graph/resolvers/page.js | 31 ++++++++++++++++++++++++-------
 1 file changed, 24 insertions(+), 7 deletions(-)

diff --git a/server/graph/resolvers/page.js b/server/graph/resolvers/page.js
index 53275ff7..b9db3793 100644
--- a/server/graph/resolvers/page.js
+++ b/server/graph/resolvers/page.js
@@ -246,14 +246,31 @@ module.exports = {
      * FETCH PAGE LINKS
      */
     async links (obj, args, context, info) {
-      let results = []
+      let results;
 
-      results = await WIKI.models.knex('pages')
-        .column({ id: 'pages.id' }, { path: 'pages.path' }, 'title', { link: 'pageLinks.path' }, { locale: 'pageLinks.localeCode' })
-        .fullOuterJoin('pageLinks', 'pages.id', 'pageLinks.pageId')
-        .where({
-          'pages.localeCode': args.locale
-        })
+      if (WIKI.config.db.type === 'mysql' || WIKI.config.db.type === 'mariadb' || WIKI.config.db.type === 'sqlite') {
+        results = await WIKI.models.knex('pages')
+          .column({ id: 'pages.id' }, { path: 'pages.path' }, 'title', { link: 'pageLinks.path' }, { locale: 'pageLinks.localeCode' })
+          .leftJoin('pageLinks', 'pages.id', 'pageLinks.pageId')
+          .where({
+            'pages.localeCode': args.locale
+          })
+          .unionAll(
+            WIKI.models.knex('pageLinks')
+              .column({ id: 'pages.id' }, { path: 'pages.path' }, 'title', { link: 'pageLinks.path' }, { locale: 'pageLinks.localeCode' })
+              .leftJoin('pages', 'pageLinks.pageId', 'pages.id')
+              .where({
+                'pages.localeCode': args.locale
+              })
+          )
+      } else {
+        results = await WIKI.models.knex('pages')
+          .column({ id: 'pages.id' }, { path: 'pages.path' }, 'title', { link: 'pageLinks.path' }, { locale: 'pageLinks.localeCode' })
+          .fullOuterJoin('pageLinks', 'pages.id', 'pageLinks.pageId')
+          .where({
+            'pages.localeCode': args.locale
+          })
+      }
 
       return _.reduce(results, (result, val) => {
         // -> Check if user has access to source and linked page