Added donor donation amount to the donor response

ref #66

src/models/entities/Donor.ts

@@ -1,4 +1,4 @@
-import { IsBoolean } from "class-validator";
+import { IsBoolean, IsInt } from "class-validator";
 import { ChildEntity, Column, OneToMany } from "typeorm";
 import { ResponseDonor } from '../responses/ResponseDonor';
 import { Donation } from './Donation';
@@ -24,6 +24,15 @@ export class Donor extends Participant {
   @OneToMany(() => Donation, donation => donation.donor, { nullable: true })
   donations: Donation[];
 
+  /**
+   * Returns the total donations of a donor based on his linked donations.
+  */
+  @IsInt()
+  public get donationAmount(): number {
+    if (!this.donations) { return 0; }
+    return this.donations.reduce((sum, current) => sum + current.amount, 0);
+  }
+
   /**
    * Turns this entity into it's response class.
    */

src/models/responses/ResponseDonor.ts

@@ -1,5 +1,5 @@
 import {
-    IsBoolean
+    IsBoolean, IsInt
 } from "class-validator";
 import { Donor } from '../entities/Donor';
 import { ResponseParticipant } from './ResponseParticipant';
@@ -15,6 +15,12 @@ export class ResponseDonor extends ResponseParticipant {
     @IsBoolean()
     receiptNeeded: boolean;
 
+    /**
+    * Returns the total donations of a donor based on his linked donations.
+    */
+    @IsInt()
+    donationAmount: number;
+
     /**
      * Creates a ResponseRunner object from a runner.
      * @param runner The user the response shall be build for.
@@ -22,5 +28,6 @@ export class ResponseDonor extends ResponseParticipant {
     public constructor(donor: Donor) {
         super(donor);
         this.receiptNeeded = donor.receiptNeeded;
+        this.donationAmount = donor.donationAmount;
     }
 }