n8n/packages/nodes-base/nodes/Postgres/v2/actions/database/upsert.operation.ts

import type { IExecuteFunctions } from 'n8n-core';
import type { IDataObject, INodeExecutionData, INodeProperties } from 'n8n-workflow';

import { updateDisplayOptions } from '../../../../../utils/utilities';

import type {
	PgpDatabase,
	QueriesRunner,
	QueryValues,
	QueryWithValues,
} from '../../helpers/interfaces';

import {
	addReturning,
	checkItemAgainstSchema,
	getTableSchema,
	prepareItem,
	replaceEmptyStringsByNulls,
} from '../../helpers/utils';

import { optionsCollection } from '../common.descriptions';

const properties: INodeProperties[] = [
	{
		displayName: 'Data Mode',
		name: 'dataMode',
		type: 'options',
		options: [
			{
				name: 'Auto-Map Input Data to Columns',
				value: 'autoMapInputData',
				description: 'Use when node input properties names exactly match the table column names',
			},
			{
				name: 'Map Each Column Manually',
				value: 'defineBelow',
				description: 'Set the value for each destination column manually',
			},
		],
		default: 'autoMapInputData',
		description:
			'Whether to map node input properties and the table data automatically or manually',
	},
	{
		displayName: `
		In this mode, make sure incoming data fields are named the same as the columns in your table. If needed, use a 'Set' node before this node to change the field names.
		`,
		name: 'notice',
		type: 'notice',
		default: '',
		displayOptions: {
			show: {
				dataMode: ['autoMapInputData'],
			},
		},
	},
	{
		// eslint-disable-next-line n8n-nodes-base/node-param-display-name-miscased, n8n-nodes-base/node-param-display-name-wrong-for-dynamic-options
		displayName: 'Column to Match On',
		name: 'columnToMatchOn',
		type: 'options',
		required: true,
		description:
			'The column to compare when finding the rows to update. Choose from the list, or specify an ID using an <a href="https://docs.n8n.io/code-examples/expressions/">expression</a>.',
		typeOptions: {
			loadOptionsMethod: 'getColumns',
			loadOptionsDependsOn: ['schema.value', 'table.value'],
		},
		default: '',
		hint: "Used to find the correct row(s) to update. Doesn't get changed. Has to be unique.",
	},
	{
		displayName: 'Value of Column to Match On',
		name: 'valueToMatchOn',
		type: 'string',
		default: '',
		description:
			'Rows with a value in the specified "Column to Match On" that corresponds to the value in this field will be updated. New rows will be created for non-matching items.',
		displayOptions: {
			show: {
				dataMode: ['defineBelow'],
			},
		},
	},
	{
		displayName: 'Values to Send',
		name: 'valuesToSend',
		placeholder: 'Add Value',
		type: 'fixedCollection',
		typeOptions: {
			multipleValueButtonText: 'Add Value',
			multipleValues: true,
		},
		displayOptions: {
			show: {
				dataMode: ['defineBelow'],
			},
		},
		default: {},
		options: [
			{
				displayName: 'Values',
				name: 'values',
				values: [
					{
						// eslint-disable-next-line n8n-nodes-base/node-param-display-name-wrong-for-dynamic-options
						displayName: 'Column',
						name: 'column',
						type: 'options',
						description:
							'Choose from the list, or specify an ID using an <a href="https://docs.n8n.io/code-examples/expressions/">expression</a>',
						typeOptions: {
							loadOptionsMethod: 'getColumnsWithoutColumnToMatchOn',
							loadOptionsDependsOn: ['schema.value', 'table.value'],
						},
						default: [],
					},
					{
						displayName: 'Value',
						name: 'value',
						type: 'string',
						default: '',
					},
				],
			},
		],
	},
	optionsCollection,
];

const displayOptions = {
	show: {
		resource: ['database'],
		operation: ['upsert'],
	},
	hide: {
		table: [''],
	},
};

export const description = updateDisplayOptions(displayOptions, properties);

export async function execute(
	this: IExecuteFunctions,
	runQueries: QueriesRunner,
	items: INodeExecutionData[],
	nodeOptions: IDataObject,
	db: PgpDatabase,
): Promise<INodeExecutionData[]> {
	items = replaceEmptyStringsByNulls(items, nodeOptions.replaceEmptyStrings as boolean);

	const queries: QueryWithValues[] = [];

	for (let i = 0; i < items.length; i++) {
		const schema = this.getNodeParameter('schema', i, undefined, {
			extractValue: true,
		}) as string;

		const table = this.getNodeParameter('table', i, undefined, {
			extractValue: true,
		}) as string;

		const columnToMatchOn = this.getNodeParameter('columnToMatchOn', i) as string;

		const dataMode = this.getNodeParameter('dataMode', i) as string;

		let item: IDataObject = {};

		if (dataMode === 'autoMapInputData') {
			item = items[i].json;
		}

		if (dataMode === 'defineBelow') {
			const valuesToSend = (this.getNodeParameter('valuesToSend', i, []) as IDataObject)
				.values as IDataObject[];

			item = prepareItem(valuesToSend);

			item[columnToMatchOn] = this.getNodeParameter('valueToMatchOn', i) as string;
		}

		const tableSchema = await getTableSchema(db, schema, table);

		item = checkItemAgainstSchema(this.getNode(), item, tableSchema, i);

		let values: QueryValues = [schema, table];

		let valuesLength = values.length + 1;
		const onConflict = ` ON CONFLICT ($${valuesLength}:name) DO UPDATE `;
		valuesLength = valuesLength + 1;
		values.push(columnToMatchOn);

		const insertQuery = `INSERT INTO $1:name.$2:name($${valuesLength}:name) VALUES($${valuesLength}:csv)${onConflict}`;
		valuesLength = valuesLength + 1;
		values.push(item);

		const updateColumns = Object.keys(item).filter((column) => column !== columnToMatchOn);

		const updates: string[] = [];

		for (const column of updateColumns) {
			updates.push(`$${valuesLength}:name = $${valuesLength + 1}`);
			valuesLength = valuesLength + 2;
			values.push(column, item[column] as string);
		}

		let query = `${insertQuery} SET ${updates.join(', ')}`;

		const outputColumns = this.getNodeParameter('options.outputColumns', i, ['*']) as string[];

		[query, values] = addReturning(query, outputColumns, values);

		queries.push({ query, values });
	}

	return runQueries(queries, items, nodeOptions);
}