Fix sync error after changing child item to top-level

chrome/content/zotero/xpcom/data/dataObjectUtilities.js

@@ -138,6 +138,7 @@ Zotero.DataObjectUtilities = {
 					break;
 				
 				case 'deleted':
+				case 'parentItem':
 					target[i] = false;
 					break;
 				

test/tests/collectionTest.js

@@ -201,6 +201,19 @@ describe("Zotero.Collection", function() {
 		})
 	})
 	
+	describe("#toJSON()", function () {
+		it("should set 'parentCollection' to false when cleared", function* () {
+			var col1 = yield createDataObject('collection');
+			var col2 = yield createDataObject('collection', { parentID: col1.id });
+			// Create initial JSON with parentCollection
+			var patchBase = col2.toJSON();
+			// Clear parent collection and regenerate JSON
+			col2.parentID = false;
+			var json = col2.toJSON({ patchBase });
+			assert.isFalse(json.parentCollection);
+		});
+	});
+	
 	describe("#getDescendents()", function () {
 		var collection0, collection1, collection2, collection3, item1, item2, item3;
 		

test/tests/itemTest.js

@@ -1138,6 +1138,18 @@ describe("Zotero.Item", function () {
 				assert.isUndefined(json.title);
 				assert.strictEqual(json.deleted, 1);
 			})
+			
+			it("should set 'parentItem' to false when cleared", function* () {
+				var item = yield createDataObject('item');
+				var note = new Zotero.Item('note');
+				note.parentID = item.id;
+				// Create initial JSON with parentItem
+				var patchBase = note.toJSON();
+				// Clear parent item and regenerate JSON
+				note.parentID = false;
+				var json = note.toJSON({ patchBase });
+				assert.isFalse(json.parentItem);
+			});
 		})
 	})