diff --git a/api/models/Book.js b/api/models/Book.js
index 940be66..5c3dfa0 100644
--- a/api/models/Book.js
+++ b/api/models/Book.js
@@ -12,6 +12,12 @@ module.exports = {
     //  ╔═╗╦═╗╦╔╦╗╦╔╦╗╦╦  ╦╔═╗╔═╗
     //  ╠═╝╠╦╝║║║║║ ║ ║╚╗╔╝║╣ ╚═╗
     //  ╩  ╩╚═╩╩ ╩╩ ╩ ╩ ╚╝ ╚═╝╚═╝
+    id: {
+      type: 'string',
+      unique: true,
+      autoIncrement: true,
+      columnName: '_id'
+    },
     title: {type: 'string', required: true},
     author: {type: 'string'},
     isbn: {type: 'string'},
diff --git a/api/models/Passport.js b/api/models/Passport.js
index 89e61ee..93fc08d 100644
--- a/api/models/Passport.js
+++ b/api/models/Passport.js
@@ -25,6 +25,12 @@ async function hashPassword (passport) {
 
 module.exports = {
   attributes: {
+    id: {
+      type: 'string',
+      unique: true,
+      autoIncrement: true,
+      columnName: '_id'
+    },
     // local, oauth2, etc
     protocol: {
       type: 'string',
@@ -40,11 +46,6 @@ module.exports = {
     user: {
       model: 'User',
       required: true
-    },
-
-    // methods
-    validatePassword: async function (password) {
-      return bcrypt.compare(password, this.password)
     }
   },
 
@@ -60,5 +61,10 @@ module.exports = {
   */
   beforeUpdate: async function (passport) {
     return hashPassword(passport)
+  },
+
+  // methods
+  validatePassword: async function (password, passport) {
+    return bcrypt.compare(password, passport.password)
   }
 }
diff --git a/api/models/User.js b/api/models/User.js
index b36d4a1..8c7d504 100644
--- a/api/models/User.js
+++ b/api/models/User.js
@@ -14,11 +14,13 @@ module.exports = {
     id: {
       type: 'string',
       unique: true,
+      autoIncrement: true,
       columnName: '_id'
     },
     email: {
       type: 'string',
-      unique: true
+      unique: true,
+      required: true
     },
     password: 'string'