/**
 * Using `v_query`, add the rows to `v_table`
 */
(function executeQuery(v_table, v_query) {
​
	fetchAllIncidents(v_table, v_query);
​
	/**
	 * fetch all incidents records from the remote instance
	 */
	function fetchAllIncidents(v_table, v_query) {
		// Uses RestMessage with name 'Remote Instance Incidents' and function 'All Incidents'
		// Create a RestMessage first which calls an external REST service
		try {
			var restMessage = new sn_ws.RESTMessageV2('Remote Instance Incidents', 'All Incidents');
			var response = restMessage.execute();
			var responseBody = response.getBody();
			
			// if REST call ends up in an error, set the last error message which shows up
			// at the bottom of the list view
			if (response.haveError()) {
				v_query.setLastErrorMessage(response.getErrorMessage());
				// can use gs.error() or gs.addErrorMessage() while debugging
				// gs.debug() messages visible in session debugger
				// gs.debug(response.getErrorMessage());
				return;
			}
		} catch (ex) {
			v_query.setLastErrorMessage(ex.message);
			// gs.debug(ex.message);
			return;
		}
​
		var transformerDefinition = getTransformerDefinition();
		var transformer = new sn_tfrm.Transformer(transformerDefinition, responseBody);
		// transformer parses the responseBody and extracts rows
		while (transformer.transform()) {
			// row is field-value map e.g. { active:"true", number: "INC0000001"}
			var row = transformer.getRow();
			// you may do any additional transformations to the row like GlideDuration, GlideDataTime etc. For example,
			// row.duration = new GlideDuration(row.duration);
​
			// finally add the row to the remote table
			v_table.addRow(row);
		}
	}
​
	/**
	 * returns a sn_tfrm.TransformerDefinition, which defines the mapping of the table fields and elements in the response body
	 */
	function getTransformerDefinition() {
		// create a rule list to map a field to its element path
		var ruleList = new sn_tfrm.TransformerRuleList()
			.fromJSON() // the response body is a JSON
			// 'active' field maps to path '$.active'
			.addRule("active", "$.active")
			.addRule("caller_id", "$.caller_id.value")
			.addRule("number", "$.number")
			.addRule("short_description", "$.short_description")
			.addRule("sys_id", "$.sys_id")
			.addRule("updates", "$.sys_mod_count");
​
		var recordPath = "$.result";
		return new sn_tfrm.TransformerDefinition(ruleList, recordPath);
	}
	
})(v_table, v_query);

These code snippets are of note in this script:

function fetchAllIncidents(v_table, v_query) {
		// Uses RestMessage with name 'Remote Instance Incidents' and function 'All Incidents'
		// Create a RestMessage first which calls an external REST service
		try {
			var restMessage = new sn_ws.RESTMessageV2('Remote Instance Incidents', 'All Incidents');
			var response = restMessage.execute();
			var responseBody = response.getBody();
			
			// if REST call ends up in an error, set the last error message which shows up
			// at the bottom of the list view
			if (response.haveError()) {
				v_query.setLastErrorMessage(response.getErrorMessage());
				// can use gs.error() or gs.addErrorMessage() while debugging
				// gs.debug() messages visible in session debugger
				// gs.debug(response.getErrorMessage());
				return;
			}
		} catch (ex) {
			v_query.setLastErrorMessage(ex.message);
			// gs.debug(ex.message);
			return;
		}

You can create a RestMessage and directly use it in the script. In this example, it uses a RESTMessageV2 API with the name of Remote Instance Incidents, and the function All Incidents, which gets all incident data. Once a response is returned from the server, an error message appears if problems are encountered in the data retrieval.

If no problems are encountered in the data retrieval, it gets the data body for the records.

		var transformerDefinition = getTransformerDefinition();
		var transformer = new sn_tfrm.Transformer(transformerDefinition, responseBody);
		// transformer parses the responseBody and extracts rows
		while (transformer.transform()) {
			// row is field-value map e.g. { active:"true", number: "INC0000001"}
			var row = transformer.getRow();
			// you may do any additional transformations to the row like GlideDuration, GlideDataTime etc. For example,
			// row.duration = new GlideDuration(row.duration);
​
			// finally add the row to the remote table
			v_table.addRow(row);

It then uses the Transformer API to perform any required data transformations, extracts rows, and then adds a row for each record to the remote table.

/**
	 * returns a sn_tfrm.TransformerDefinition, which defines the mapping of the table fields and elements in the response body
	 */
	function getTransformerDefinition() {
		// create a rule list to map a field to its element path
		var ruleList = new sn_tfrm.TransformerRuleList()
			.fromJSON() // the response body is a JSON
			// 'active' field maps to path '$.active'
			.addRule("active", "$.active")
			.addRule("caller_id", "$.caller_id.value")
			.addRule("number", "$.number")
			.addRule("short_description", "$.short_description")
			.addRule("sys_id", "$.sys_id")
			.addRule("updates", "$.sys_mod_count");
​
		var recordPath = "$.result";
		return new sn_tfrm.TransformerDefinition(ruleList, recordPath);
	}
	
})(v_table, v_query);