fix(editor): Handle drag-n-dropping from other nodes in assignment co…

…mponent (n8n-io#8661)

packages/editor-ui/src/components/AssignmentCollection/__tests__/utils.test.ts

@@ -0,0 +1,15 @@
+import { nameFromExpression } from '../utils';
+
+describe('AssignmentCollection > utils', () => {
+	describe('nameFromExpression', () => {
+		test('should extract assignment name from previous node', () => {
+			expect(nameFromExpression('{{ $json.foo.bar }}')).toBe('foo.bar');
+		});
+
+		test('should extract assignment name from another node', () => {
+			expect(nameFromExpression("{{ $('Node's \"Name\" (copy)').item.json.foo.bar }}")).toBe(
+				'foo.bar',
+			);
+		});
+	});
+});

packages/editor-ui/src/components/AssignmentCollection/utils.ts

@@ -4,7 +4,10 @@ import { resolveParameter } from '@/composables/useWorkflowHelpers';
 import { v4 as uuid } from 'uuid';
 
 export function nameFromExpression(expression: string): string {
-	return expression.replace(/^{{\s*|\s*}}$/g, '').replace('$json.', '');
+	return expression
+		.replace(/^{{\s*|\s*}}$/g, '')
+		.replace('$json.', '')
+		.replace(/^\$\(.*\)(\.item\.json)?\.(.*)/, '$2');
 }
 
 export function inferAssignmentType(value: unknown): string {