Schemas I think

schemas/Purchase.js

@@ -0,0 +1,12 @@
+const mongoose = require("mongoose");
+const Schema = mongoose.Schema;
+
+const Purchase = new Schema({
+  date: Date,
+  blue: Number,
+  red: Number,
+  yellow: Number,
+  green: Number
+});
+
+module.exports = Purchase;