remove redundant collection parameter in dbtools functions

JS/dbtools.js

@@ -7,16 +7,16 @@ client.connect();
 
 const dbtools = {
     collection: client.db('inventorydb').collection('systems'),
-    insertSystem: async function (collection, system) {
-        const result = await collection.insertOne(system);
+    insertSystem: async function (system) {
+        const result = await this.collection.insertOne(system);
         console.log(`Created a system entry with id: ${result.insertedId}`);
     },
-    deleteSystem: async function (collection, serial) {
-        const result = await collection.deleteOne({ serialnum: serial});
+    deleteSystem: async function (serial) {
+        const result = await this.collection.deleteOne({ serialnum: serial});
         console.log(`${result.deletedCount} document(s) was/were deleted.`);
     },
-    getAllSystems: async function (collection) {
-        cursor = await collection.find();
+    getAllSystems: async function () {
+        cursor = await this.collection.find();
         let allSystems = []
         await cursor.forEach( function (result) {allSystems.push(result);});
         return allSystems;

JS/excelreader.js

@@ -30,13 +30,13 @@ console.log(`Watching directory for changes...` )
 
 inventoryWatcher
     .on('add', function(filepath) {
-        dbtools.insertSystem(dbtools.collection, readInventoryFile(filepath));
+        dbtools.insertSystem(readInventoryFile(filepath));
     })
     .on('change', function(filepath) {
         console.log('File', path, 'has been changed');
     })
     .on('unlink', function(filepath) {
-        dbtools.deleteSystem(dbtools.collection, parseInt(Path.basename(filepath, '.xlsx')));
+        dbtools.deleteSystem(parseInt(Path.basename(filepath, '.xlsx')));
     })
     .on('error', function(error) {
         console.error('Error happened', error);

JS/index.js

@@ -11,7 +11,7 @@ app.get('/', (req, res) => {
 });
 
 app.get('/systems', async function(req, res) {
-	result = await dbtools.getAllSystems(dbtools.collection);
+	result = await dbtools.getAllSystems();
 	console.log(result);
 	res.send(result);