fix: Disable pinning for root nodes from canvas (n8n-io#8848)

packages/editor-ui/src/composables/__tests__/useContextMenu.test.ts

@@ -1,11 +1,13 @@
 import type { INodeUi } from '@/Interface';
 import { useContextMenu } from '@/composables/useContextMenu';
-import { NO_OP_NODE_TYPE, STICKY_NODE_TYPE, STORES } from '@/constants';
+import { BASIC_CHAIN_NODE_TYPE, NO_OP_NODE_TYPE, STICKY_NODE_TYPE, STORES } from '@/constants';
 import { faker } from '@faker-js/faker';
 import { createTestingPinia } from '@pinia/testing';
 import { setActivePinia } from 'pinia';
 import { useSourceControlStore } from '@/stores/sourceControl.store';
 import { useUIStore } from '@/stores/ui.store';
+import { useWorkflowsStore } from '@/stores/workflows.store';
+import { NodeHelpers } from 'n8n-workflow';
 
 const nodeFactory = (data: Partial<INodeUi> = {}): INodeUi => ({
 	id: faker.string.uuid(),
@@ -20,6 +22,7 @@ const nodeFactory = (data: Partial<INodeUi> = {}): INodeUi => ({
 describe('useContextMenu', () => {
 	let sourceControlStore: ReturnType<typeof useSourceControlStore>;
 	let uiStore: ReturnType<typeof useUIStore>;
+	let workflowsStore: ReturnType<typeof useWorkflowsStore>;
 	const nodes = [nodeFactory(), nodeFactory(), nodeFactory()];
 	const selectedNodes = nodes.slice(0, 2);
 
@@ -34,10 +37,19 @@ describe('useContextMenu', () => {
 		);
 		sourceControlStore = useSourceControlStore();
 		uiStore = useUIStore();
+		workflowsStore = useWorkflowsStore();
 		vi.spyOn(uiStore, 'isReadOnlyView', 'get').mockReturnValue(false);
 		vi.spyOn(sourceControlStore, 'preferences', 'get').mockReturnValue({
 			branchReadOnly: false,
 		} as never);
+		vi.spyOn(workflowsStore, 'getCurrentWorkflow').mockReturnValue({
+			nodes,
+			getNode: (_: string) => {
+				return {};
+			},
+		} as never);
+
+		vi.spyOn(NodeHelpers, 'getNodeInputs').mockReturnValue([]);
 	});
 
 	afterEach(() => {
@@ -80,6 +92,17 @@ describe('useContextMenu', () => {
 		expect(targetNodes.value).toEqual([sticky]);
 	});
 
+	it('should disable pinning for node that has other inputs then "main"', () => {
+		const { open, isOpen, actions, targetNodes } = useContextMenu();
+		const basicChain = nodeFactory({ type: BASIC_CHAIN_NODE_TYPE });
+		vi.spyOn(NodeHelpers, 'getConnectionTypes').mockReturnValue(['main', 'ai_languageModel']);
+		open(mockEvent, { source: 'node-right-click', node: basicChain });
+
+		expect(isOpen.value).toBe(true);
+		expect(actions.value.find((action) => action.id === 'toggle_pin')?.disabled).toBe(true);
+		expect(targetNodes.value).toEqual([basicChain]);
+	});
+
 	it('should return the correct actions when right clicking a Node', () => {
 		const { open, isOpen, actions, targetNodes } = useContextMenu();
 		const node = nodeFactory();

packages/editor-ui/src/composables/useContextMenu.ts

@@ -9,6 +9,7 @@ import { useSourceControlStore } from '@/stores/sourceControl.store';
 import { useUIStore } from '@/stores/ui.store';
 import { useWorkflowsStore } from '@/stores/workflows.store';
 import type { IActionDropdownItem } from 'n8n-design-system/src/components/N8nActionDropdown/ActionDropdown.vue';
+import { NodeHelpers, NodeConnectionType } from 'n8n-workflow';
 import type { INode, INodeTypeDescription } from 'n8n-workflow';
 import { computed, ref, watch } from 'vue';
 import { getMousePosition } from '../utils/nodeViewUtils';
@@ -158,6 +159,16 @@ export const useContextMenu = (onAction: ContextMenuActionCallback = () => {}) =
 				...selectionActions,
 			];
 		} else {
+			const nonMainInputs = (node: INode) => {
+				const workflow = workflowsStore.getCurrentWorkflow();
+				const workflowNode = workflow.getNode(node.name);
+				const nodeType = nodeTypesStore.getNodeType(node.type, node.typeVersion);
+				const inputs = NodeHelpers.getNodeInputs(workflow, workflowNode!, nodeType!);
+				const inputNames = NodeHelpers.getConnectionTypes(inputs);
+
+				return !!inputNames.find((inputName) => inputName !== NodeConnectionType.Main);
+			};
+
 			const menuActions: IActionDropdownItem[] = [
 				!onlyStickies && {
 					id: 'toggle_activation',
@@ -173,7 +184,7 @@ export const useContextMenu = (onAction: ContextMenuActionCallback = () => {}) =
 						? i18n.baseText('contextMenu.unpin', i18nOptions)
 						: i18n.baseText('contextMenu.pin', i18nOptions),
 					shortcut: { keys: ['p'] },
-					disabled: isReadOnly.value || !nodes.every(canPinNode),
+					disabled: nodes.some(nonMainInputs) || isReadOnly.value || !nodes.every(canPinNode),
 				},
 				{
 					id: 'copy',