Feature/paired item support (#3869)

* Add paired item helper and implement it in some nodes

packages/nodes-base/nodes/Discourse/Discourse.node.ts

@@ -1,11 +1,8 @@
 import { IExecuteFunctions } from 'n8n-core';
 
 import {
-	ICredentialsDecrypted,
-	ICredentialTestFunctions,
 	IDataObject,
 	ILoadOptionsFunctions,
-	INodeCredentialTestResult,
 	INodeExecutionData,
 	INodePropertyOptions,
 	INodeType,
@@ -21,17 +18,9 @@ import { categoryFields, categoryOperations } from './CategoryDescription';
 
 import { groupFields, groupOperations } from './GroupDescription';
 
-// import {
-// 	searchFields,
-// 	searchOperations,
-// } from './SearchDescription';
-
 import { userFields, userOperations } from './UserDescription';
 
 import { userGroupFields, userGroupOperations } from './UserGroupDescription';
-import { OptionsWithUri } from 'request';
-
-//import moment from 'moment';
 
 export class Discourse implements INodeType {
 	description: INodeTypeDescription = {
@@ -122,7 +111,7 @@ export class Discourse implements INodeType {
 
 	async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
 		const items = this.getInputData();
-		const returnData: IDataObject[] = [];
+		const returnData: INodeExecutionData[] = [];
 		const length = items.length;
 		const qs: IDataObject = {};
 		let responseData;
@@ -431,19 +420,24 @@ export class Discourse implements INodeType {
 						);
 					}
 				}
-				if (Array.isArray(responseData)) {
-					returnData.push.apply(returnData, responseData as IDataObject[]);
-				} else if (responseData !== undefined) {
-					returnData.push(responseData as IDataObject);
-				}
+
+				const executionData = this.helpers.constructExecutionMetaData(
+					this.helpers.returnJsonArray(responseData),
+					{ itemData: { item: i } },
+				);
+				returnData.push(...executionData);
 			} catch (error) {
 				if (this.continueOnFail()) {
-					returnData.push({ error: (error as JsonObject).message });
+					const executionErrorData = this.helpers.constructExecutionMetaData(
+						this.helpers.returnJsonArray({ error: error.message }),
+						{ itemData: { item: i } },
+					);
+					returnData.push(...executionErrorData);
 					continue;
 				}
 				throw error;
 			}
 		}
-		return [this.helpers.returnJsonArray(returnData)];
+		return this.prepareOutputData(returnData);
 	}
 }