cognitive level converted to array

Author: Hitansh159

models/practical.js

@@ -5,11 +5,11 @@ const practicalSchema = {
   type: { type: String, required: true },
   title: { type: String, required: true },
   hours: { type: Number, required: true },
-  cognitiveLevels: {
+  cognitiveLevels: [{
     type: String,
     required: true,
     enum: ["L1", "L2", "L3", "L4", "L5", "L6"],
-  },
+  }],
 };
 
 const Practical = connector.model("Practical", practicalSchema);