Add random PIS return

Signed-off-by: Fred Boniface <fred@fjla.uk>

src/services/pis.services.js

@@ -28,7 +28,7 @@ async function findPisByOrigDest(start,end) {
 }
 
 async function findPisByCode(code) {
-  log.out(`pisServices.findPisByCode: Searching for PIS code: ${code}`);
+  log.out(`pisServices.findPisByCode: Searching for PIS code: ${code}`, 'dbug');
   const cleanCode = clean.removeNonNumeric(code);
   const query = {
     'code': parseInt(cleanCode)
@@ -37,9 +37,21 @@ async function findPisByCode(code) {
   return await search;
 }
 
+async function findRandom() {
+  log.out('pisServices.findRandom: Finding five random PIS Codes', 'dbug');
+  const query = {
+    $sample: {
+      size: 5
+    }
+  };
+  const results = db.query('pis', query);
+  return results;
+}
+
 // Hopefully at some point, I will also be able to implement a find PIS code by headcode option.
 
 module.exports = {
   findPisByOrigDest,
-  findPisByCode
+  findPisByCode,
+  findRandom
 };