fix(Postgres Node): Allow passing in arrays to JSON columns for insert (

n8n-io#12452)

packages/nodes-base/nodes/Postgres/test/v2/operations.test.ts

@@ -6,6 +6,7 @@ import type {
 	INode,
 	INodeParameters,
 } from 'n8n-workflow';
+import pgPromise from 'pg-promise';
 
 import * as deleteTable from '../../v2/actions/database/deleteTable.operation';
 import * as executeQuery from '../../v2/actions/database/executeQuery.operation';
@@ -506,6 +507,7 @@ describe('Test PostgresV2, insert operation', () => {
 			items,
 			nodeOptions,
 			createMockDb(columnsInfo),
+			pgPromise(),
 		);
 
 		expect(runQueries).toHaveBeenCalledWith(
@@ -579,6 +581,7 @@ describe('Test PostgresV2, insert operation', () => {
 			inputItems,
 			nodeOptions,
 			createMockDb(columnsInfo),
+			pgPromise(),
 		);
 
 		expect(runQueries).toHaveBeenCalledWith(
@@ -600,6 +603,96 @@ describe('Test PostgresV2, insert operation', () => {
 			nodeOptions,
 		);
 	});
+
+	it('dataMode: define, should accept an array with values if column is of type json', async () => {
+		const convertValuesToJsonWithPgpSpy = jest.spyOn(utils, 'convertValuesToJsonWithPgp');
+		const hasJsonDataTypeInSchemaSpy = jest.spyOn(utils, 'hasJsonDataTypeInSchema');
+
+		const values = [
+			{ value: { id: 1, json: [], foo: 'data 1' }, expected: { id: 1, json: '[]', foo: 'data 1' } },
+			{
+				value: {
+					id: 2,
+					json: [0, 1],
+					foo: 'data 2',
+				},
+				expected: {
+					id: 2,
+					json: '[0,1]',
+					foo: 'data 2',
+				},
+			},
+			{
+				value: {
+					id: 2,
+					json: [0],
+					foo: 'data 2',
+				},
+				expected: {
+					id: 2,
+					json: '[0]',
+					foo: 'data 2',
+				},
+			},
+		];
+
+		values.forEach(async (value) => {
+			const valuePassedIn = value.value;
+			const nodeParameters: IDataObject = {
+				schema: {
+					__rl: true,
+					mode: 'list',
+					value: 'public',
+				},
+				table: {
+					__rl: true,
+					value: 'my_table',
+					mode: 'list',
+				},
+				columns: {
+					mappingMode: 'defineBelow',
+					value: valuePassedIn,
+				},
+				options: { nodeVersion: 2.5 },
+			};
+			const columnsInfo: ColumnInfo[] = [
+				{ column_name: 'id', data_type: 'integer', is_nullable: 'NO', udt_name: '' },
+				{ column_name: 'json', data_type: 'json', is_nullable: 'NO', udt_name: '' },
+				{ column_name: 'foo', data_type: 'text', is_nullable: 'NO', udt_name: '' },
+			];
+
+			const inputItems = [
+				{
+					json: valuePassedIn,
+				},
+			];
+
+			const nodeOptions = nodeParameters.options as IDataObject;
+			const pg = pgPromise();
+
+			await insert.execute.call(
+				createMockExecuteFunction(nodeParameters),
+				runQueries,
+				inputItems,
+				nodeOptions,
+				createMockDb(columnsInfo),
+				pg,
+			);
+
+			expect(runQueries).toHaveBeenCalledWith(
+				[
+					{
+						query: 'INSERT INTO $1:name.$2:name($3:name) VALUES($3:csv) RETURNING *',
+						values: ['public', 'my_table', value.expected],
+					},
+				],
+				inputItems,
+				nodeOptions,
+			);
+			expect(convertValuesToJsonWithPgpSpy).toHaveBeenCalledWith(pg, columnsInfo, valuePassedIn);
+			expect(hasJsonDataTypeInSchemaSpy).toHaveBeenCalledWith(columnsInfo);
+		});
+	});
 });
 
 describe('Test PostgresV2, select operation', () => {

packages/nodes-base/nodes/Postgres/test/v2/utils.test.ts

@@ -1,5 +1,6 @@
 import type { IDataObject, INode } from 'n8n-workflow';
 import { NodeOperationError } from 'n8n-workflow';
+import pgPromise from 'pg-promise';
 
 import type { ColumnInfo } from '../../v2/helpers/interfaces';
 import {
@@ -14,6 +15,8 @@ import {
 	wrapData,
 	convertArraysToPostgresFormat,
 	isJSON,
+	convertValuesToJsonWithPgp,
+	hasJsonDataTypeInSchema,
 } from '../../v2/helpers/utils';
 
 const node: INode = {
@@ -387,6 +390,57 @@ describe('Test PostgresV2, checkItemAgainstSchema', () => {
 	});
 });
 
+describe('Test PostgresV2, hasJsonDataType', () => {
+	it('returns true if there are columns which are of type json', () => {
+		const schema: ColumnInfo[] = [
+			{ column_name: 'data', data_type: 'json', is_nullable: 'YES' },
+			{ column_name: 'id', data_type: 'integer', is_nullable: 'NO' },
+		];
+
+		expect(hasJsonDataTypeInSchema(schema)).toEqual(true);
+	});
+
+	it('returns false if there are columns which are of type json', () => {
+		const schema: ColumnInfo[] = [{ column_name: 'id', data_type: 'integer', is_nullable: 'NO' }];
+
+		expect(hasJsonDataTypeInSchema(schema)).toEqual(false);
+	});
+});
+
+describe('Test PostgresV2, convertValuesToJsonWithPgp', () => {
+	it('should use pgp to properly convert values to JSON', () => {
+		const pgp = pgPromise();
+		const pgpJsonSpy = jest.spyOn(pgp.as, 'json');
+
+		const schema: ColumnInfo[] = [
+			{ column_name: 'data', data_type: 'json', is_nullable: 'YES' },
+			{ column_name: 'id', data_type: 'integer', is_nullable: 'NO' },
+		];
+		const values = [
+			{
+				value: { data: [], id: 1 },
+				expected: { data: '[]', id: 1 },
+			},
+			{
+				value: { data: [0], id: 1 },
+				expected: { data: '[0]', id: 1 },
+			},
+			{
+				value: { data: { key: 2 }, id: 1 },
+				expected: { data: '{"key":2}', id: 1 },
+			},
+		];
+
+		values.forEach((value) => {
+			const data = value.value.data;
+
+			expect(convertValuesToJsonWithPgp(pgp, schema, value.value)).toEqual(value.expected);
+			expect(value.value).toEqual(value.expected);
+			expect(pgpJsonSpy).toHaveBeenCalledWith(data, true);
+		});
+	});
+});
+
 describe('Test PostgresV2, convertArraysToPostgresFormat', () => {
 	it('should convert js arrays to postgres format', () => {
 		const item = {

packages/nodes-base/nodes/Postgres/v2/actions/database/insert.operation.ts

@@ -1,13 +1,14 @@
-import type {
-	IDataObject,
-	IExecuteFunctions,
-	INodeExecutionData,
-	INodeProperties,
+import {
+	type IDataObject,
+	type IExecuteFunctions,
+	type INodeExecutionData,
+	type INodeProperties,
 } from 'n8n-workflow';
 
 import { updateDisplayOptions } from '@utils/utilities';
 
 import type {
+	PgpClient,
 	PgpDatabase,
 	PostgresNodeOptions,
 	QueriesRunner,
@@ -22,6 +23,8 @@ import {
 	prepareItem,
 	convertArraysToPostgresFormat,
 	replaceEmptyStringsByNulls,
+	hasJsonDataTypeInSchema,
+	convertValuesToJsonWithPgp,
 } from '../../helpers/utils';
 import { optionsCollection } from '../common.descriptions';
 
@@ -160,6 +163,7 @@ export async function execute(
 	items: INodeExecutionData[],
 	nodeOptions: PostgresNodeOptions,
 	db: PgpDatabase,
+	pgp: PgpClient,
 ): Promise<INodeExecutionData[]> {
 	items = replaceEmptyStringsByNulls(items, nodeOptions.replaceEmptyStrings as boolean);
 	const nodeVersion = nodeOptions.nodeVersion as number;
@@ -215,11 +219,16 @@ export async function execute(
 					: ((this.getNodeParameter('columns.values', i, []) as IDataObject)
 							.values as IDataObject[]);
 
-			if (nodeVersion < 2.2) {
-				item = prepareItem(valuesToSend);
-			} else {
-				item = this.getNodeParameter('columns.value', i) as IDataObject;
-			}
+			item =
+				nodeVersion < 2.2
+					? prepareItem(valuesToSend)
+					: hasJsonDataTypeInSchema(tableSchema)
+						? convertValuesToJsonWithPgp(
+								pgp,
+								tableSchema,
+								(this.getNodeParameter('columns', i) as IDataObject)?.value as IDataObject,
+							)
+						: (this.getNodeParameter('columns.value', i) as IDataObject);
 		}
 
 		tableSchema = await updateTableSchema(db, tableSchema, schema, table);

packages/nodes-base/nodes/Postgres/v2/actions/router.ts

@@ -43,6 +43,7 @@ export async function router(this: IExecuteFunctions): Promise<INodeExecutionDat
 				items,
 				options,
 				db,
+				pgp,
 			);
 			break;
 		default:

packages/nodes-base/nodes/Postgres/v2/helpers/utils.ts

@@ -394,6 +394,24 @@ export function prepareItem(values: IDataObject[]) {
 	return item;
 }
 
+export function hasJsonDataTypeInSchema(schema: ColumnInfo[]) {
+	return schema.some(({ data_type }) => data_type === 'json');
+}
+
+export function convertValuesToJsonWithPgp(
+	pgp: PgpClient,
+	schema: ColumnInfo[],
+	values: IDataObject,
+) {
+	schema
+		.filter(({ data_type }: { data_type: string }) => data_type === 'json')
+		.forEach(({ column_name }) => {
+			values[column_name] = pgp.as.json(values[column_name], true);
+		});
+
+	return values;
+}
+
 export async function columnFeatureSupport(
 	db: PgpDatabase,
 ): Promise<{ identity_generation: boolean; is_generated: boolean }> {