Mitigated circular dependency (to be fixed)

ref #65

src/models/entities/Donor.ts

@@ -1,5 +1,6 @@
 import { IsBoolean } from "class-validator";
-import { ChildEntity, Column } from "typeorm";
+import { ChildEntity, Column, OneToMany } from "typeorm";
+import { Donation } from './Donation';
 import { Participant } from "./Participant";
 
 /**
@@ -14,4 +15,11 @@ export class Donor extends Participant {
   @Column()
   @IsBoolean()
   receiptNeeded: boolean = false;
+
+  /**
+ * Used to link the participant as the donor of a donation.
+ * Attention: Only runner's can be associated as a distanceDonations distance source.
+ */
+  @OneToMany(() => Donation, donation => donation.donor, { nullable: true })
+  donations: Donation[];
 }