ex 3.20

part3/phonebook-backend/index.js

@@ -83,17 +83,26 @@ app.post('/api/persons', (request, response, next) => {
   //     error: "name or number missing"
   //   })
   // }
-
-  const newPerson = new Person ({
-    name: body.name,
-    number: body.number,
+  Person.countDocuments({ name: body.name })
+    .then(count => {
+      if (count > 0) {
+        return response.status(400).json({
+          error: 'name already exists'
+        })
+      } else {
+        const newPerson = new Person ({
+          name: body.name,
+          number: body.number,
+        })
+
+        newPerson.save()
+          .then(savedPerson => {
+            response.json(savedPerson)
+          })
+          .catch(error => next(error))
+      }
   })
 
-  newPerson.save()
-    .then(savedPerson => {
-      response.json(savedPerson)
-    })
-    .catch(error => next(error))
 })
 
 // unknown endpoint middleware

part3/phonebook-backend/models/person.js

@@ -20,6 +20,10 @@ const personSchema = new mongoose.Schema({
     },
     number: {
         type: String,
+        minLength: 8,
+        validate: num => {
+            return /\d{2,3}-\d{5,}/.test(num)
+        },
         required: true
     }
 })

part3/phonebook-backend/requests/new_person.rest

@@ -2,6 +2,6 @@ POST http://localhost:3001/api/persons/
 Content-Type: application/json
 
 {
-    "name": "John Show",
-    "number": "1111-111-112"
+    "name": "test3",
+    "number": "111-111112"
 }