Added the donation abstract/interface

src/models/Donation.ts

@@ -0,0 +1,37 @@
+import { PrimaryGeneratedColumn, Column } from "typeorm";
+import {
+  IsInt,
+  IsNotEmpty,
+  IsOptional,
+  IsPositive,
+} from "class-validator";
+import { Participant } from "./Participant";
+
+/**
+ * Defines the donation interface.
+*/
+export abstract class Donation {
+  /**
+   * Autogenerated unique id (primary key).
+   */
+  @PrimaryGeneratedColumn()
+  @IsOptional()
+  @IsInt()
+  id: number;
+
+  /**
+   * The donations's donor.
+   */
+  @Column()
+  @IsNotEmpty()
+  //TODO: Relationship
+  donor: Participant;
+
+  /**
+   * The donation's amount in cents (or whatever your currency's smallest unit is.).
+   */
+  @Column()
+  @IsInt()
+  @IsPositive()
+  amount: number;
+}