Added payedDonationAmount to donor and responsedonor

ref #193

src/models/entities/Donor.ts

@@ -33,6 +33,15 @@ export class Donor extends Participant {
     return this.donations.reduce((sum, current) => sum + current.amount, 0);
   }
 
+  /**
+   * Returns the total payed donations of a donor based on his linked donations.
+  */
+  @IsInt()
+  public get payedDonationAmount(): number {
+    if (!this.donations) { return 0; }
+    return this.donations.reduce((sum, current) => sum + current.payedAmount, 0);
+  }
+
   /**
    * Turns this entity into it's response class.
    */