further work on bills

db/bill.ts

@@ -1,5 +1,5 @@
 import * as mongoose from 'mongoose'
-import { BILL_STATUS, MILAGE_RATES } from './enums'
+import { BILL_STATUS, MILAGE_RATES, getMilageRateValue } from './enums'
 import { BookingDocument } from './booking'
 
 export interface AdditionalCosts {
@@ -15,7 +15,6 @@ export interface BillDocument
   milageEnd: number
   milage?: number
   rate: MILAGE_RATES
-  total: number
   status: BILL_STATUS
   additionalCosts: AdditionalCosts[]
 }
@@ -27,6 +26,7 @@ const BillSchema = new mongoose.Schema<BillDocument>(
     booking: {
       type: mongoose.Schema.Types.ObjectId,
       ref: 'Booking',
+      unique: true,
       required: true,
     },
     milageStart: {
@@ -57,7 +57,7 @@ const BillSchema = new mongoose.Schema<BillDocument>(
     rate: {
       type: String,
       enum: Object.values(MILAGE_RATES),
-      default: MILAGE_RATES.EXTERN_UP_TO_200,
+      default: MILAGE_RATES.EXTERN_LTE_200,
       required: true,
     },
     additionalCosts: [
@@ -66,17 +66,17 @@ const BillSchema = new mongoose.Schema<BillDocument>(
         value: { type: Number, required: true },
       },
     ],
-    total: {
-      type: Number,
-      required: true,
-    },
     status: {
       type: String,
       enum: Object.values(BILL_STATUS),
       default: BILL_STATUS.UNINVOICED,
     },
   },
-  { timestamps: true, collation: { locale: 'de', strength: 1 } }
+  {
+    timestamps: true,
+    toJSON: { virtuals: true, getters: true },
+    toObject: { virtuals: true, getters: true },
+  }
 )
 
 BillSchema.virtual('milage').get(function () {
@@ -87,7 +87,8 @@ BillSchema.virtual('milage').get(function () {
 BillSchema.virtual('total').get(function () {
   const bill = this as BillDocument
 
-  const milageCosts = bill.milage * bill.rate
+  const milageCosts =
+    Math.round(bill.milage * getMilageRateValue(bill.rate) * 100) / 100
   const additionalCostSum = bill.additionalCosts
     .map(({ value }) => value)
     .reduce((acc, value) => acc + value, 0)