fix(Postgres Node): Allow passing in arrays to JSON columns for insert (#12452)

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 }> {