Fix related-item relations pointing to a previous user account

If somebody switched accounts in a previous version, it was apparently
possible for related items to end up pointing at an item URI with the
old userID, which could cause a 403 on sync.

https://forums.zotero.org/discussion/70989/report-id-477331252

(5.0 deletes data when switching accounts to avoid exactly this sort of
bug.)

chrome/content/zotero/xpcom/schema.js

@@ -2414,6 +2414,23 @@ Zotero.Schema = new function(){
 				yield Zotero.DB.queryAsync("DELETE FROM relationPredicates WHERE predicate='dc:isReplacedBy'");
 			}
 
+			else if (i == 100) {
+				let userID = yield Zotero.DB.valueQueryAsync("SELECT value FROM settings WHERE setting='account' AND key='userID'");
+				if (userID) {
+					let predicateID = yield Zotero.DB.valueQueryAsync("SELECT predicateID FROM relationPredicates WHERE predicate='dc:relation'");
+					let rows = yield Zotero.DB.queryAsync("SELECT itemID, object FROM items JOIN itemRelations IR USING (itemID) WHERE libraryID=? AND predicateID=?", [1, predicateID]);
+					for (let row of rows) {
+						let matches = row.object.match(/^http:\/\/zotero.org\/users\/(\d+)\/items\/([A-Z0-9]+)$/);
+						if (matches) {
+							// Wrong libraryID
+							if (matches[1] != userID) {
+								yield Zotero.DB.queryAsync(`UPDATE itemRelations SET object='http://zotero.org/users/${userID}/items/${matches[2]}' WHERE itemID=? AND predicateID=?`, [row.itemID, predicateID]);
+							}
+						}
+					}
+				}
+			}
+
 			// If breaking compatibility or doing anything dangerous, clear minorUpdateFrom
 		}
 

resource/schema/userdata.sql

@@ -1,4 +1,4 @@
--- 99
+-- 100
 
 -- Copyright (c) 2009 Center for History and New Media
 --                    George Mason University, Fairfax, Virginia, USA