fix: resolve SplitInBatches output confusion for AI assistants (#97)
## Problem AI assistants were consistently connecting SplitInBatches node outputs backwards because: - Output index 0 = "done" (runs after loop completes) - Output index 1 = "loop" (processes items inside loop) This counterintuitive ordering caused incorrect workflow connections. ## Solution Enhanced the n8n-mcp system to expose and clarify output information: ### Database & Schema - Added `outputs` and `output_names` columns to nodes table - Updated NodeRepository to store/retrieve output information ### Node Parsing - Enhanced NodeParser to extract outputs and outputNames from nodes - Properly handles versioned nodes like SplitInBatchesV3 ### MCP Server - Modified getNodeInfo to return detailed output descriptions - Added connection guidance for each output - Special handling for loop nodes (SplitInBatches, IF, Switch) ### Documentation - Enhanced DocsMapper to inject critical output guidance - Added warnings about counterintuitive output ordering - Provides correct connection patterns for loop nodes ### Workflow Validation - Added validateSplitInBatchesConnection method - Detects reversed connections and provides specific errors - Added checkForLoopBack with depth limit to prevent stack overflow - Smart heuristics to identify likely connection mistakes ## Testing - Created comprehensive test suite (81 tests) - Unit tests for all modified components - Edge case handling for malformed data - Performance testing with large workflows ## Impact AI assistants will now: - See explicit output indices and names (e.g., "Output 0: done") - Receive clear connection guidance - Get validation errors when connections are reversed - Have enhanced documentation explaining the correct pattern Fixes #97 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
czlonkowski
434
tests/unit/services/workflow-validator-loops-simple.test.ts
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434
tests/unit/services/workflow-validator-loops-simple.test.ts
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import { describe, it, expect, beforeEach, vi } from 'vitest';
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import { WorkflowValidator } from '@/services/workflow-validator';
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import { NodeRepository } from '@/database/node-repository';
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import { EnhancedConfigValidator } from '@/services/enhanced-config-validator';
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// Mock dependencies
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vi.mock('@/database/node-repository');
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vi.mock('@/services/enhanced-config-validator');
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describe('WorkflowValidator - SplitInBatches Validation (Simplified)', () => {
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let validator: WorkflowValidator;
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let mockNodeRepository: any;
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let mockNodeValidator: any;
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beforeEach(() => {
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vi.clearAllMocks();
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mockNodeRepository = {
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getNode: vi.fn()
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};
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mockNodeValidator = {
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validateWithMode: vi.fn().mockReturnValue({
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errors: [],
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warnings: []
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})
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};
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validator = new WorkflowValidator(mockNodeRepository, mockNodeValidator);
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});
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describe('SplitInBatches node detection', () => {
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it('should identify SplitInBatches nodes in workflow', async () => {
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mockNodeRepository.getNode.mockReturnValue({
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nodeType: 'nodes-base.splitInBatches',
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properties: []
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});
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const workflow = {
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name: 'SplitInBatches Workflow',
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nodes: [
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{
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id: '1',
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name: 'Split In Batches',
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type: 'n8n-nodes-base.splitInBatches',
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position: [100, 100],
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parameters: { batchSize: 10 }
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},
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{
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id: '2',
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name: 'Process Item',
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type: 'n8n-nodes-base.set',
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position: [300, 100],
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parameters: {}
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}
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],
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connections: {
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'Split In Batches': {
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main: [
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[], // Done output (0)
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[{ node: 'Process Item', type: 'main', index: 0 }] // Loop output (1)
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]
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}
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}
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};
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const result = await validator.validateWorkflow(workflow);
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// Should complete validation without crashing
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expect(result).toBeDefined();
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expect(result.valid).toBeDefined();
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});
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it('should handle SplitInBatches with processing node name patterns', async () => {
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mockNodeRepository.getNode.mockReturnValue({
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nodeType: 'nodes-base.splitInBatches',
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properties: []
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});
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const processingNames = [
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'Process Item',
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'Transform Data',
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'Handle Each',
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'Function Node',
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'Code Block'
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];
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for (const nodeName of processingNames) {
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const workflow = {
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name: 'Processing Pattern Test',
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nodes: [
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{
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id: '1',
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name: 'Split In Batches',
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type: 'n8n-nodes-base.splitInBatches',
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position: [100, 100],
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parameters: {}
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},
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{
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id: '2',
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name: nodeName,
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type: 'n8n-nodes-base.function',
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position: [300, 100],
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parameters: {}
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}
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],
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connections: {
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'Split In Batches': {
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main: [
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[{ node: nodeName, type: 'main', index: 0 }], // Processing node on Done output
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[]
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]
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}
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}
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};
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const result = await validator.validateWorkflow(workflow);
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// Should identify potential processing nodes
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expect(result).toBeDefined();
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}
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});
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it('should handle final processing node patterns', async () => {
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mockNodeRepository.getNode.mockReturnValue({
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nodeType: 'nodes-base.splitInBatches',
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properties: []
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});
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const finalNames = [
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'Final Summary',
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'Send Email',
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'Complete Notification',
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'Final Report'
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];
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for (const nodeName of finalNames) {
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const workflow = {
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name: 'Final Pattern Test',
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nodes: [
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{
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id: '1',
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name: 'Split In Batches',
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type: 'n8n-nodes-base.splitInBatches',
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position: [100, 100],
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parameters: {}
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},
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{
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id: '2',
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name: nodeName,
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type: 'n8n-nodes-base.emailSend',
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position: [300, 100],
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parameters: {}
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}
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],
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connections: {
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'Split In Batches': {
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main: [
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[{ node: nodeName, type: 'main', index: 0 }], // Final node on Done output (correct)
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[]
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]
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}
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}
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};
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const result = await validator.validateWorkflow(workflow);
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// Should not warn about final nodes on done output
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expect(result).toBeDefined();
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}
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});
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});
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describe('Connection validation', () => {
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it('should validate connection indices', async () => {
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mockNodeRepository.getNode.mockReturnValue({
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nodeType: 'nodes-base.splitInBatches',
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properties: []
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});
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const workflow = {
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name: 'Connection Index Test',
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nodes: [
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{
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id: '1',
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name: 'Split In Batches',
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type: 'n8n-nodes-base.splitInBatches',
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position: [100, 100],
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parameters: {}
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},
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{
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id: '2',
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name: 'Target',
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type: 'n8n-nodes-base.set',
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position: [300, 100],
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parameters: {}
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}
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],
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connections: {
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'Split In Batches': {
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main: [
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[{ node: 'Target', type: 'main', index: -1 }] // Invalid negative index
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]
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}
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}
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};
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const result = await validator.validateWorkflow(workflow);
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const negativeIndexErrors = result.errors.filter(e =>
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e.message?.includes('Invalid connection index -1')
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);
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expect(negativeIndexErrors.length).toBeGreaterThan(0);
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});
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it('should handle non-existent target nodes', async () => {
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mockNodeRepository.getNode.mockReturnValue({
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nodeType: 'nodes-base.splitInBatches',
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properties: []
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});
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const workflow = {
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name: 'Missing Target Test',
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nodes: [
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{
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id: '1',
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name: 'Split In Batches',
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type: 'n8n-nodes-base.splitInBatches',
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position: [100, 100],
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parameters: {}
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}
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],
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connections: {
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'Split In Batches': {
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main: [
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[{ node: 'NonExistentNode', type: 'main', index: 0 }]
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]
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}
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}
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};
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const result = await validator.validateWorkflow(workflow);
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const missingNodeErrors = result.errors.filter(e =>
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e.message?.includes('non-existent node')
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);
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expect(missingNodeErrors.length).toBeGreaterThan(0);
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});
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});
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describe('Self-referencing connections', () => {
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it('should allow self-referencing for SplitInBatches nodes', async () => {
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mockNodeRepository.getNode.mockReturnValue({
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nodeType: 'nodes-base.splitInBatches',
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properties: []
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});
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const workflow = {
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name: 'Self Reference Test',
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nodes: [
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{
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id: '1',
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name: 'Split In Batches',
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type: 'n8n-nodes-base.splitInBatches',
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position: [100, 100],
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parameters: {}
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}
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],
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connections: {
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'Split In Batches': {
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main: [
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[],
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[{ node: 'Split In Batches', type: 'main', index: 0 }] // Self-reference on loop output
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]
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}
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}
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};
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const result = await validator.validateWorkflow(workflow);
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// Should not warn about self-reference for SplitInBatches
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const selfRefWarnings = result.warnings.filter(w =>
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w.message?.includes('self-referencing')
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);
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expect(selfRefWarnings).toHaveLength(0);
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});
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it('should warn about self-referencing for non-loop nodes', async () => {
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mockNodeRepository.getNode.mockReturnValue({
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nodeType: 'nodes-base.set',
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properties: []
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});
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const workflow = {
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name: 'Non-Loop Self Reference Test',
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nodes: [
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{
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id: '1',
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name: 'Set',
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type: 'n8n-nodes-base.set',
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position: [100, 100],
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parameters: {}
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}
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],
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connections: {
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'Set': {
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main: [
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[{ node: 'Set', type: 'main', index: 0 }] // Self-reference on regular node
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]
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}
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}
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};
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const result = await validator.validateWorkflow(workflow);
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// Should warn about self-reference for non-loop nodes
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const selfRefWarnings = result.warnings.filter(w =>
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w.message?.includes('self-referencing')
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);
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expect(selfRefWarnings.length).toBeGreaterThan(0);
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});
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});
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describe('Output connection validation', () => {
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it('should validate output connections for nodes with outputs', async () => {
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mockNodeRepository.getNode.mockReturnValue({
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nodeType: 'nodes-base.if',
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outputs: [
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{ displayName: 'True', description: 'Items that match condition' },
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{ displayName: 'False', description: 'Items that do not match condition' }
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],
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outputNames: ['true', 'false'],
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properties: []
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});
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const workflow = {
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name: 'IF Node Test',
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nodes: [
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{
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id: '1',
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name: 'IF',
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type: 'n8n-nodes-base.if',
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position: [100, 100],
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parameters: {}
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},
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{
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id: '2',
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name: 'True Handler',
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type: 'n8n-nodes-base.set',
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position: [300, 50],
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parameters: {}
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},
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{
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id: '3',
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name: 'False Handler',
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type: 'n8n-nodes-base.set',
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position: [300, 150],
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parameters: {}
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}
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],
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connections: {
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'IF': {
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main: [
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[{ node: 'True Handler', type: 'main', index: 0 }], // True output (0)
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[{ node: 'False Handler', type: 'main', index: 0 }] // False output (1)
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]
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}
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}
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};
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const result = await validator.validateWorkflow(workflow);
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// Should validate without major errors
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expect(result).toBeDefined();
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expect(result.statistics.validConnections).toBe(2);
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});
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});
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describe('Error handling', () => {
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it('should handle nodes without outputs gracefully', async () => {
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mockNodeRepository.getNode.mockReturnValue({
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nodeType: 'nodes-base.httpRequest',
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outputs: null,
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outputNames: null,
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properties: []
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});
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const workflow = {
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name: 'No Outputs Test',
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nodes: [
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{
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id: '1',
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name: 'HTTP Request',
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type: 'n8n-nodes-base.httpRequest',
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position: [100, 100],
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parameters: {}
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}
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],
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connections: {}
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};
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const result = await validator.validateWorkflow(workflow);
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// Should handle gracefully without crashing
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expect(result).toBeDefined();
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});
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it('should handle unknown node types gracefully', async () => {
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mockNodeRepository.getNode.mockReturnValue(null);
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const workflow = {
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name: 'Unknown Node Test',
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nodes: [
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{
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id: '1',
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name: 'Unknown',
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type: 'n8n-nodes-base.unknown',
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position: [100, 100],
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parameters: {}
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}
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],
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connections: {}
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};
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const result = await validator.validateWorkflow(workflow);
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// Should report unknown node error
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const unknownErrors = result.errors.filter(e =>
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e.message?.includes('Unknown node type')
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);
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expect(unknownErrors.length).toBeGreaterThan(0);
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});
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});
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});
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