Essential backend functionality, including logins.

api/models/bookModel.js

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+'use strict';
+const mongoose = require('mongoose');
+const Schema = mongoose.Schema;
+
+const BookSchema = new Schema({
+  title: {
+    type: String,
+    required: 'Book title missing'
+  },
+  publication_date: {
+    type: Date,
+    default: Date(0)
+  },
+  quantity: {
+    type: Number,
+    default: 1
+  },
+  amount_loaned: {
+    type: Number,
+    default: 0
+  },
+  isbn13: {
+    type: String,
+    required: 'Book ISBN-13 missing'
+  }
+});
+
+module.exports = mongoose.model('Book', BookSchema);

api/models/userModel.js

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+'use strict';
+const mongoose = require('mongoose');
+const Schema = mongoose.Schema;
+
+const permission_set = {
+  add_books: {
+    type: Boolean,
+    default: true
+  },
+  update_books: {
+    type: Boolean,
+    default: false
+  },
+  borrow_books: {
+    type: Boolean,
+    default: true
+  },
+  add_users: {
+    type: Boolean,
+    default: false
+  },
+  delete_users: {
+    type: Boolean,
+    default: false
+  },
+  delete_books: {
+    type: Boolean,
+    default: false
+  },
+  update_users: {
+    type: Boolean,
+    default: false
+  },
+  change_permissions: {
+    type: Boolean,
+    default: false
+  }
+};
+
+const UserSchema = new Schema({
+  username: {
+    type: String,
+    required: 'Username missing'
+  },
+  password: {
+    type: String,
+    required: 'Password missing'
+  },
+  email: String,
+  student_card: String,
+  borrowing: [{
+    bookId: Schema.Types.ObjectId,
+    date: Date
+  }],
+  permissions: permission_set
+});
+
+UserSchema.set('toJSON', {
+  transform: function(doc, ret, options) {
+    const json = {
+      username: ret.username,
+      borrowing: ret.borrowing,
+      permissions: ret.permissions,
+      _id: ret._id
+    };
+    return json;
+  }
+});
+
+module.exports = mongoose.model('User', UserSchema);