simplified controllers, added post example

server/controllers/controller.js

@@ -1,17 +1,18 @@
+import mongoose from 'mongoose';
 import Example from './../models/model.js';
 
-const getExamples = (request, response) => {
-  // what is .find() ???   --->   https://mongoosejs.com/docs/queries.html
-  Example.find((error, data) => {
-    if (error) {
-      console.log(`❌ ${error}`);
-      return response.status(404).json(error); // 404 not found + catched error -> send to client
-    } else {
-      console.log('✅ -FOUND- :', data);
-      return response.status(200).json(data); // 200 ok + array of documents -> send to client
-    }
-    // more about response status codes   --->   https://restapitutorial.com/httpstatuscodes.html
-  });
-};
+export const getExamples = (request, response, next) =>
+  Example.find() // what is .find() ???   --->   https://mongoosejs.com/docs/queries.html
+    .then((data) => response.status(200).json(data))
+    .catch((error) => response.status(500).json(error));
 
-export default getExamples;
+export const uploadExample = (request, response, next) =>
+  new Example({
+    _id: mongoose.Types.ObjectId(), // _id is set by default, you can remove this line
+    name: request.body.fieldName, // fieldName === name used on client side
+  })
+    .save() // what is .save() ???   --->   https://mongoosejs.com/docs/api.html#document_Document-save
+    .then.then((data) => response.status(201).json(data))
+    .catch((error) => response.status(500).json(error));
+
+// more about response status codes   --->   https://restapitutorial.com/httpstatuscodes.html