Upload 4.2

part4/bloglist/models/blog.js

@@ -0,0 +1,18 @@
+const mongoose = require('mongoose')
+
+const blogSchema = new mongoose.Schema({
+  title: String,
+  author: String,
+  url: String,
+  likes: Number
+})
+
+blogSchema.set('toJSON', {
+  transform: (document, returnedObject) => {
+    returnedObject.id = returnedObject._id.toString()
+    delete returnedObject._id
+    delete returnedObject.__v
+  }
+})
+
+module.exports = mongoose.model('Blog', blogSchema)